Name: 
 

1



True/False
Indicate whether the statement is true or false.
 

 1. 

1 radian = 57.3 degrees.
 

 2. 

Work is done on a car by a parking brake that is keeping it from rolling down a hill.
 

 3. 

Mechanical work is done only when a force or torque moves an object.
 

 4. 

A construction crane applies a 1000 lb force on a 5 ton I-beam, doing mechanical work?
 

 5. 

When air keeps a bike tire inflated, the amount of work is equal to the pressure in the tire.
 

 6. 

Liquids and gases tend to move from areas of low-pressure to areas of high-pressure.
 

 7. 

A sewer system is an example of a closed fluid system.
 

 8. 

A hydraulic jack is an example of a closed fluid system.
 

 9. 

When a hydraulic cylinder moves, it displaces a volume of fluid.
 

 10. 

In a fluid system work is done when a pressure difference causes liquids or gas to move.
 

 11. 

Useful work can be done in closed fluid systems to provide mechanical work.
 

 12. 

The basic unit of an electrical charge is the coulomb.
 

 13. 

6.25 tf013-1.jpg 1018 electrons = 1 coulomb.
 

 14. 

Electrical work happens when a voltage doesn’t move a charge.
 

 15. 

Voltage differences cause a charge to move.
 

 16. 

For an electrical device to be 100% efficient, work out must equal work in.
 

 17. 

Electricity is not a very efficient way to transport energy.
 

 18. 

In devices such as rotating motors, radios, and coffee pots, we can’t actually see the electrical work being done.  We can only see the results of electrical work.
 

 19. 

Deceleration is a rate increase.
 

 20. 

Speed is a scalar quantity
 

 21. 

The equation for linear speed is tf021-1.jpg.
 

 22. 

Average velocity and average speed are the same.
 

 23. 

A train going down a mountain will demonstrate a change of acceleration.
 

 24. 

Miles per hour (mph) is the SI unit for speed.
 

 25. 

Speed not only tells us how fast something is moving but it also tells us in what direction the object is moving.
 

 26. 

The speed of an object is its velocity
 

 27. 

When a car slows to a stop sign its acceleration changes.
 

 28. 

tf028-1.jpg is used to figure the time it takes to move a volume.
 

 29. 

It would not be important for the manager of a city water treatment plant to know the flow rate of water through the system.
 

 30. 

Locating compressed air sources (storage tanks or compressors) near the point of use makes no difference on flow rate.
 

 31. 

Volume-flow rate is found by dividing the volume of fluid flowing by the time required to flow through the pipe.
 

 32. 

Rates in fluid systems can be measured by calculating fluid speed.
 

Multiple Choice
Identify the choice that best completes the statement or answers the question.
 

 33. 

Work is equal to force applied to an object ______________ the distance the object moves in the direction of the applied force.
a.
plus
b.
minus
c.
multiplied by
d.
divided by
 

 34. 

A special airport truck is used to push a heavy airliner away from the terminal.  The truck pushes with a force of 2000 lb for a distance of 150 ft.  The mechanical work done by the truck is ____________.
a.
30,000 ft·lb
b.
300,000 ft/lb
c.
300,000 ft·lb
d.
30,000 ft/lb
 

 35. 

A ninety degree angle is equal to ____.
a.
mc035-1.jpg rad
b.
4p rad
c.
mc035-2.jpg rad
d.
2p rad
 

 36. 

Useful work is defined is applied force mc036-1.jpg _________.
a.
mass
b.
distance
c.
weight
d.
density
 

 37. 

An SI unit for work is _________.
a.
N·m
b.
ft·lb
c.
N
d.
kg
 

 38. 

You are using a winch to pull your boat out of water.  To calculate the work put into the winch you should use which formula?
a.
Work = force mc038-1.jpg distance
c.
Work = pressure difference mc038-3.jpg volume
b.
Work = torque mc038-2.jpg angle swept
d.
Work = voltage mc038-4.jpg current
 

 39. 

The SI unit for work is _______.
a.
ft·lb
b.
N/m
c.
Joule
d.
lb/ft
 

 40. 

The formula for calculating efficiency is ____________________.
a.
mc040-1.jpg
c.
mc040-3.jpg
b.
mc040-2.jpg
d.
mc040-4.jpg
 

 41. 

One radian is equal to ________.
a.
360 degrees
b.
57.3 degrees
c.
2p radians
 

 42. 

Torque can be calculated using ___________________.     
a.
mc042-1.jpg
b.
mc042-2.jpg
c.
mc042-3.jpg
d.
mc042-4.jpg
e.
mc042-5.jpg
 

 43. 

When a force is applied to an object, the object may ______________.
a.
move
b.
be deformed
c.
rotate
d.
all of these
 

 44. 

Work is done on a barbell when it is _____________.
a.
resting on the floor
b.
held steady by the lifter after it is raised
c.
moving during the lift
 

 45. 

When mechanical work is done on an object _______________________.
a.
the object remains stationary
c.
the object remains at rest
b.
the object must move
d.
the object disappears
 

 46. 

GIVEN:  mc046-1.jpg
  mc046-2.jpg
A block and tackle is used to raise a deer weighing 250 lbs a distance of 2 feet.  The hunter pulls with a force of 100 lbs for 6 feet.  Find the efficiency of the block and tackle.
a.
67%
b.
75%
c.
83%
d.
92%
 

 47. 

Work is being done by a football passing quarterback _____________________________.
a.
when the ball is on the ground
b.
during the throwing motion of the quarterback’s arm with the ball in his hand
c.
while the ball is sailing through the air
 

 48. 

How many radians (rads) are there in a 360 degree circle?
a.
3.24 rads
b.
57.3 rads
c.
6.28 rads
d.
360 rads
 

 49. 

Which of the following is not a SI system of measuring work?
a.
ft·lb
b.
joule
c.
N·m
 

 50. 

Which of the following descriptions match the definition of work?
a.
A winch pulling a truck out of a ditch.
b.
An escalator transporting people to a new floor.
c.
A pitcher throwing a 90 mph fast ball.
d.
All of the above are descriptions of the work definition.
 

 51. 

Two students push on a car for 15 minutes to try to get it out of the ditch they drove it into.  The car is stuck so deep in the mud that it doesn’t even budge.  How much work has been done on the car by the students?
a.
30 joules
c.
none
b.
30 ft·lbs
d.
there isn’t enough information to know
 

 52. 

If the output work is divided by the input work in a mechanical system, the result is ______________.
a.
efficiency
b.
work
c.
power
d.
force
 

 53. 

Another name for a Newton-meter is ______________.
a.
radian
b.
joule
c.
torque
d.
force
 

 54. 

How much work is done when a winch lifts 50 lbs a distance of 1 foot off the floor?
a.
500 ft/lbs
b.
50 ft·lbs
c.
torque
d.
100 ft·lbs
 

 55. 

What is the efficiency of a block and tackle that is used to lift a 1000 lb safe one foot off the floor, by a worker applying 100 ft·lbs of force?
a.
100%
b.
10%
c.
1000%
d.
1%
 

 56. 

When adding more pulleys to a system, _______________________________.
a.
the force of the weight increases.
c.
the pulling force increases.
b.
the force of the weight decreases.
d.
the pulling force decreases.
 

 57. 

When a pump is used to raise water through a pressure difference, the work done by the pump is equal to the ___________________ multiplied by the pressure difference.
a.
fluid weight moved
c.
distance fluid moves
b.
fluid volume moved
d.
weight density of fluid
 

 58. 

The work done by a moving piston in a hydraulic cylinder is equal to the pressure exerted by the piston multiplied by the ______________________.
a.
area of the piston face
b.
fluid volume displaced
c.
weight density of the fluid
 

 59. 

The purpose of pumps in fluid systems is to ___________________________.
a.
cause fluids to move slowly
b.
increase resistance to flow
c.
create a pressure difference that causes fluid to move
 

 60. 

A pump lifts 2 cubic meters of water through a pressure difference of 200,000 N/mmc060-1.jpg.  The fluid work done by the pump is _______________.
a.
400,000 N/m
b.
400,000 N·m
c.
100,000 N/m
d.
100,000 N·m
 

 61. 

A hydraulic cylinder displaces 0.25 ftmc061-1.jpg of oil while the piston moves a distance of 1 ft.  The pressure on the face of the piston is 60 lb/ftmc061-2.jpg.  The work done by the hydraulic cylinder while moving the piston 1 ft is __________.
a.
60 ft·lb
b.
60 ft/lb
c.
15 ft·lb
d.
240 ft·lb
 

 62. 

Work done by a hydraulic cylinder is ____________ work.
a.
mechanical
b.
fluid
c.
electrical
d.
thermal
 

 63. 

An example of a closed fluid system is __________________________.
a.
a cities water system
c.
a fire truck
b.
an irrigation system
d.
the circulatory system
 

 64. 

What is the fluid work done by a pump that lifts 100 ftmc064-1.jpg of water through a pressure difference of 5000 lb/ftmc064-2.jpg.
a.
500,000 N·m
b.
500,000 lb/ft
c.
500,000 ft·lb
d.
50,000 ft·lb
 

 65. 

An automobile air-conditioning system is an example of a(n) ____________________.
a.
closed fluid system
b.
open fluid system
 

 66. 

A hydraulic cylinder rod is displaced 1 ft by a pressure of 100 lb/ftmc066-1.jpg.  What is the work done if 0.5 ftmc066-2.jpg of fluid is displaced?
a.
50 N·m
b.
50 ft·lb
c.
200 ft·lb
d.
100 ft·lb
 

 67. 

In a fluid system, work is done when _________________________________.
a.
we inhale and expand our lungs
b.
a pressure difference causes liquids or gases to move
c.
water is pumped through a control valve, moving a piston
d.
all of these
 

 68. 

A fluid system that retains and recirculates fluids is called ___________________.
a.
an open system
b.
a closed system
c.
a pneumatic system
 

 69. 

In the equation for fluid system work, mc069-1.jpg, the value for mc069-2.jpg would be found by rearranging the equation in which of the following ways?
a.
mc069-3.jpg
b.
mc069-4.jpg
c.
mc069-5.jpg
d.
none of these
 

 70. 

An open fluid system moves fluids, but ____________ retain and recirculate the fluids throughout the system.
a.
does
b.
does not
 

 71. 

In a fluid system work is done when a _________________ causes liquids or gases to move.
a.
temperature difference
c.
voltage difference
b.
pressure difference
d.
energy difference
 

 72. 

What is the quantity moved in a fluid system?
a.
weight
b.
distance
c.
volume
d.
density
 

 73. 

Which of the following is an equation for work done in a pressure system?
a.
mc073-1.jpg volume displaced
b.
W = pressure difference mc073-2.jpg V
c.
both a and b are equations for work done in a pressure system
 

 74. 

Which of the following is not an example of a fluid system?
a.
movement of natural gas through pipes from supplier to user
b.
movement of oil through pipes from wells to refineries (Alaskan Oil Spill)
c.
movement of air through ducts in air-conditioning systems
d.
movement of the crankshaft which turns the shaft rod
 

 75. 

Which of the following is a closed system?
a.
a person using a drinking straw
b.
a thermometer
c.
an automobile gas tank
d.
a human digestive track
e.
lake water flowing over a dam
 

 76. 

Which of the following is an open fluid system?
a.
the human circulatory system
b.
an automobile cooling system
c.
the coolant in a refrigeration system
d.
an automobile windshield washer system
e.
an automobile brake system
 

 77. 

Which of the following is not true?
a.
fluids flow from low pressure to high pressure
b.
fluids flow uphill only if work is done
 

 78. 

What type of work does the work equation mc078-1.jpg represent?
a.
mechanical work
b.
electrical work
c.
fluid work
d.
thermal work
 

 79. 

Work done in fluids can be calculated by using which of the following?  (Note: there may be more than on correct answer.)
a.
mc079-1.jpg
c.
mc079-3.jpg
b.
mc079-2.jpg
d.
mc079-4.jpg
 

 80. 

Which of the following equations correctly defines electrical work?
a.
mc080-1.jpg
b.
mc080-2.jpg
c.
mc080-3.jpg
d.
mc080-4.jpg
 

 81. 

In electrical work, the displacement-like quantity is the charge that’s moved.  The force-like quantity is __________________.
a.
the voltage difference
c.
measured in joules
b.
the product of the current and time
d.
measured in newtons
 

 82. 

The coulomb is a unit of electrical charge that’s equal to _______________.
a.
one ampere
c.
60 ampere-seconds
b.
the charge on 6.25 mc082-1.jpg 10mc082-2.jpg electrons
d.
one ampere-second
 

 83. 

A 1.5-volt battery delivers 6 coulombs of charge.  How much work has it done?
a.
4 ampere-hours
b.
9 joules
c.
4 joules
d.
9 newtons/meter
 

 84. 

An electrical motor does 800 N·m of useful mechanical work while it uses up 1000 joules of electrical energy.  The efficiency of this motor is ______.
a.
100%
b.
125%
c.
80%
d.
none of these
 

 85. 

A 12-volt battery does 180 V·C of work.  How much charge has it moved? 
a.
2160 coulombs
c.
9.375mc085-2.jpg coulombs
b.
7.813mc085-1.jpg coulombs
d.
15 coulombs
 

 86. 

Current is defined as _______________________.
a.
6.25mc086-1.jpg joules
c.
amount of charge moved per second
b.
one ampere-second
d.
all of these
 

 87. 

A 220V electric motor draws a current of 40 amperes for five seconds. 
How many coulombs of charge are moved? 
Remember, charge (q) = current(I)mc087-1.jpgtime(t).
a.
8 coulombs
b.
5.5 coulombs
c.
55 coulombs
d.
200 coulombs
 

 88. 

The unit for electrical charge is _____________.
a.
amp
b.
volt
c.
Newton
d.
coulomb
 

 89. 

Electricity can do useful work by _______________________.
a.
doing mechanical work
c.
producing light
b.
producing heat
d.
all of these
 

 90. 

An ammeter will measure _____________________.
a.
electrical current
b.
charge
c.
voltage
d.
force
 

 91. 

The positive charge is carried by _______________.
a.
protons
b.
electrons
c.
neutrons
 

 92. 

Electrical work is equal to _________________________.
a.
volts mc092-1.jpg force
c.
volts mc092-3.jpg coulombs
b.
coulombs mc092-2.jpg mass
d.
joules mc092-4.jpg coulombs
 

 93. 

AC electricity is produced by a _______________________.
a.
alternator
b.
generator
c.
motor
 

 94. 

1 amp second equals _________________.
a.
1 joule
b.
1 coulomb
c.
1 volt
d.
1 watt
 

 95. 

The unit of electrical  work is the ______________.
a.
ampere
b.
joule
c.
coulomb
d.
volt
 

 96. 

The unit for the rate of movement of electrical work is the ___________.
a.
ampere
b.
joule
c.
coulomb
d.
volt
 

 97. 

The force-like quantity that moves electrical charge is measured in ________________.
a.
amperes
b.
joules
c.
coulombs
d.
volts
 

 98. 

The movement or flow of an electric charge is called ________________.
a.
proton
b.
negative charge
c.
current
d.
shock
 

 99. 

An electric starter on a snow blower is active for 2.3 seconds.  It draws a current of 10 amps at a voltage of 115 volts.  Find:
a.  the total amount of charge moved (mc099-1.jpg)
b.  the electrical work done (mc099-2.jpg)
a.
23 C;  115 J
b.
23 C;  2645 J
c.
2645 C;  23 J
d.
115 C;  115V
 

 100. 

Why do we produce electricity to do work when the process is only 60% efficient?
a.
electricity is an efficient way to transport energy
b.
electricity is clean
c.
electricity is convenient and easy to use
d.
all of these
 

 101. 

A coulomb of charge is equal to _________________________.
a.
6.25 mc101-1.jpg 1018 electrons
b.
a unit of electrical charge
c.
represented by q in the equation mc101-2.jpg
d.
all of these
 

 102. 

An electrical system produces 1000 Joules of work output by using 1500 Joules of input.  The system has an efficiency percentage of _____.
a.
150%
c.
500%
b.
66.7%
d.
none of these are even close
 

 103. 

An electric motor ________________________.
a.
looses some of the electrical work as heat
b.
converts electrical work into mechanical work
c.
would be a good example of an energy transfer
d.
all of these
 

 104. 

A 9-volt battery delivers 200 coulombs of charge.  How much work has it done?
a.
180 Joules
b.
180 Amps
c.
180 Newtons
d.
2.22 Joules
 

 105. 

In the formula mc105-1.jpg, what does the q stand for?
a.
voltage difference that moves the charge
c.
quantity of charge moved
b.
pressure difference
d.
amount of electrical work
 

 106. 

Negative charge is carried by ____________.
a.
neutrons
b.
electrons
c.
protons
d.
coulombs
 

 107. 

In electrical systems 1 joule of work is also equal to ________________.
a.
1 volt-coulomb
b.
1 volt/coulomb
c.
1 coulomb/volt
d.
1 N/m
 

 108. 

The equation for electrical work is ________________.
a.
mc108-1.jpg
b.
mc108-2.jpg
c.
mc108-3.jpg
d.
mc108-4.jpg
e.
mc108-5.jpg
 

 109. 

A more efficient motor is one that works ___________________________.
a.
faster for the same work done
b.
at a higher voltage
c.
using fewer joules for the same work done
d.
using fewer coulombs for the same work done
 

 110. 

One joule is equivalent to ______________. 
a.
1 volt-coulomb
b.
1 radian
c.
1 ampere-hour
 

 111. 

What are the effects of electrical work? 
a.
cause movement
b.
produce heat
c.
produce light
d.
produce electromagnetic radiation
e.
all of the above
 

 112. 

A letter definition—or equation— for linear speed is _______________.
a.
mc112-1.jpg
b.
mc112-2.jpg
c.
mc112-3.jpg
d.
mc112-4.jpg
 

 113. 

A letter definition—or equation—for linear acceleration is ______________.
a.
mc113-1.jpg
b.
mc113-2.jpg
c.
mc113-3.jpg
d.
mc113-4.jpg
 

 114. 

A letter definition—or equation—for rotational or angular speed is ______________.
a.
mc114-1.jpg
b.
mc114-2.jpg
c.
mc114-3.jpg
d.
mc114-4.jpg
 

 115. 

An angular speed of 2 rpm can also be expressed as ________ rad/sec. 
(Hint: Remember that 1 min = 60 sec and 2p radians = 360°.)
a.
0.105
b.
0.209
c.
0.318
d.
0.636
 

 116. 

If the rate’s direction and magnitude are given the rate is a _________________.
a.
velocity
b.
speed
 

 117. 

Rates include all of the following except _________________________.
a.
heart rates
c.
speed of light
b.
radio signal frequency
d.
weight of an automobile
 

 118. 

Rate is defined as a displacement-like quantity divided by  ____________.
a.
distance
b.
time
c.
volume
d.
mass
 

 119. 

You traveled across the state of Nebraska, a distance of 550 miles in 12 hours. 
What was your average speed?
a.
50 miles/hr
b.
55 miles/hr
c.
45.8 miles/hr
d.
65 miles/hr
 

 120. 

Your car has been running, warming up the engine, for 7 minutes.  The engine revolved 4550 times CW.  Find the angular speed and angular velocity
a.
650 rpm;  650 rpm
c.
650 rpm;  -650 rpm
b.
600 rpm;  600 rpm
d.
600 rpm;  -600 rpm
 

 121. 

360 degrees is equal to _______ radians.
a.
p
b.
2p
c.
3p
d.
4p
 

 122. 

Speed is a __________________.
a.
vector quantity
b.
scalar quantity
 

 123. 

Which of the following is an angular rate?
a.
merry-go-round
b.
helicopter blades
c.
hands on a clock
d.
all of these
 

 124. 

Which of the following equations best defines velocity?
a.
mc124-1.jpg
b.
mc124-2.jpg
c.
mc124-3.jpg
 

 125. 

The English unit for velocity is _________.
a.
m/sec
b.
ft/sec
c.
m/sec/sec
 

 126. 

Rotational speed can be determined by ____________________________.
a.
dividing angular displacement by elapsed time
b.
dividing elapsed time by angular displacement
c.
multiplying angular displacement by elapsed time
 

 127. 

Acceleration can occur in which types of motion?
a.
linear only
b.
rotational only
c.
both linear and rotational
 

 128. 

Which symbols are used in linear equations?
a.
mc128-1.jpg
b.
mc128-2.jpg
c.
mc128-3.jpg
d.
mc128-4.jpg
e.
none of these
 

 129. 

Rates are used in which systems?
a.
mechanical
b.
fluid
c.
electrical
d.
heat
e.
all of these
 

 130. 

Which of the following is not a unit for linear motion?
a.
m/sec
b.
mi/hr
c.
ft/sec
d.
rpm
 

 131. 

A negative linear acceleration indicates that an object is _________________.
a.
slowing down
b.
speeding up
c.
changing direction
 

 132. 

What would the rate of speed of a man running 60 ft in 10 sec be?
a.
600 ft/sec
b.
60 ft/sec
c.
60 ft/10 sec
d.
6 ft/sec
 

 133. 

A car moving is ________________.
a.
linear motion
b.
rotational motion
 

 134. 

A strobe light is used to determine __________________.
a.
voltage
b.
current
c.
speed
d.
rpm
 

 135. 

Which of the following are rates? 
a.
mc135-1.jpg
c.
l = 2 m
b.
t = 3 sec
d.
mc135-2.jpg= 30 degrees
 

 136. 

Which symbols are used in rotational equations? 
a.
w
c.
t
b.
a
d.
all of the above
 

 137. 

Check all of the following that could be possible units for speed.
a.
mi/hr
b.
sec/m
c.
m/sec
d.
a and c only
e.
all of the above
 

 138. 

A useful rate associated with a fluid system is _______________.
a.
volume-flow rate
b.
fluid speed
c.
mass-flow rate
d.
both a and c
 

 139. 

If a leak in a faucet causes a water loss of 120 gallons in two days, what’s the volume-flow rate per hour (24 hours = 1 day)?
a.
6.0 gal/hr
b.
60 gal/hr
c.
2.5 gal/hr
d.
25 gal/hr
 

 140. 

An automobile air conditioner pumps 5 kg of Freon gas through the system in 3 minutes.  Find the mass-flow rate of the Freon per minute.
a.
0.6 kg/min
b.
1.7 kg/min
c.
12 kg/min
d.
15 kg/min
 

 141. 

The size of pipes that deliver fluids over long distances has a direct bearing on making the fluid available as needed.  This primarily has to do with _________________.
a.
volume-flow rate
c.
neither a nor b
b.
fluid speed control
d.
both a and b
 

 142. 

How fast a hydraulic cylinder operates is determined by ____________________.
a.
piston area
c.
none of the above
b.
fluid-flow rate
d.
both a and b
 

 143. 

Which hose would have a bigger flow rate?
a.
mc143-1.jpg-inch hose
b.
1-inch hose
 

 144. 

Common units for volume-flow rate are _____________.
a.
m3/sec
b.
ft3/sec
c.
gal/min
d.
all of these
 

 145. 

A swimming pool holds 20,000 gallons of water.  Using a hose, it takes 24 hours to fill the pool at a steady rate.  What is the volume-flow rate of water from the hose in gallons pre minute?
a.
11.9 gal/min
b.
12.9 gal/min
c.
13.9 gal/min
d.
14.9 gal/min
 

 146. 

500 grams of nitrogen gas flows past a flow meter.  This is an example of _________________.
a.
mass-flow
b.
volume-flow
 

 147. 

An air conditioning system pumps 10 lbs of Freon through the system in 4 minutes.  Find the mass-flow rate of the Freon per minute.
a.
2 kg/min
b.
2.4 kg/min
c.
1.7 lb/min
d.
2.5 lb/min
 

 148. 

A pipe with a diameter twice as large as another pipe will have a flow rate ____________________________.
a.
the same as the smaller pipe
c.
2 times as fast as the smaller pipe
b.
4 times as fast as the smaller pipe
d.
the same
 

 149. 

Compressed air should be ________________________.
a.
far from the source
b.
close to the source
c.
It doesn’t make any difference where it is located
 

 150. 

In mc150-1.jpg what does T equal?
a.
mc150-2.jpg
b.
mc150-3.jpg
c.
mc150-4.jpg
d.
mc150-5.jpg
 

 151. 

A typical mass flow rate would be __________.
a.
10 kg/sec
b.
1 m/sec
c.
10 km/sec
d.
1 ft/sec
 

 152. 

A typical volume flow rate would be ____________.
a.
gal/min
b.
liters/sec
c.
both a and b
d.
none of these
 

 153. 

How much time would it take to empty a 2-liter pop bottle if you drank at 100 mL/sec?
a.
200 sec
b.
2000 sec
c.
20 sec
d.
2 sec
 

 154. 

Volume flow rate equals _____________________________.
a.
volume of fluid moved divided by time of movement
b.
time of movement divided by volume of fluid moved
c.
volume of fluid moved multiplied by time of movement
 

 155. 

What is the rate of 10 gallons of water moving through a pipe in 2 minutes? 
(mc155-1.jpg)
a.
20 gal/min
b.
10 gal/min
c.
5 gal/min
d.
2 gal/min
 

 156. 

In the equation mc156-1.jpg, what does the symbol V stand for?
a.
mass
b.
weight
c.
voltage
d.
volume
e.
time
 

 157. 

The equation for mass flow rate is ____________________.
a.
mc157-1.jpg
b.
mc157-2.jpg
c.
mc157-3.jpg
d.
mc157-4.jpg
e.
mc157-5.jpg
 

 158. 

To convert 35 hours to minutes use the conversion factor ___________.
a.
1 h/60 min
b.
60 min/1 h
c.
3600 s/1 h
d.
1 h/60 s
e.
60 s/1 h
 

 159. 

Find the flow rate in minutes for 36.7 gal/h.
a.
2202 gal/min
b.
820 gal/min
c.
18.2 gal/min
d.
1.224 gal/min
e.
0.612 gal/min
 

 160. 

What is 186000 written in powers of 10?
a.
mc160-1.jpg
b.
mc160-2.jpg
c.
mc160-3.jpg
 

 161. 

A pipe delivers water at 3 gal/min.  If it takes 2.5 days to fill the pool, what volume is in the pool?
a.
180 gal
b.
562 gal
c.
1.08 mc161-1.jpg 104 gal
d.
5.37 mc161-2.jpg 104 gal
e.
6.48 mc161-3.jpg 105 gal
 

 162. 

Which of the following is a unit used for volume flow rate?
a.
kg/hr
b.
m/s
c.
l/min
d.
lb/min
 

 163. 

It is best to have an air compressor with a _______________________________.
a.
long hose, because this increases flow rate
b.
long hose, because this decreases flow rate
c.
short hose, because this decreases flow rate
d.
short hose, because a long hose decreases flow rate
 

Completion
Complete each sentence or statement with one of the following terms.  On the answer sheet fill in the corresponding letter from each column.
       
A                B                     C                       D                      E
      alloy            carbon                  mass                  dissolves            plastic
 

 164. 

Mechanical work is done when force or torque causes an object _________.
 

 

 165. 

The work unit of one joule is also equal to one _________________.
 

 

 166. 

The effect of mechanical work on an object is __________________________.
 

 

 167. 

________________ is equal to output work divided by input work.
 

 

 168. 

When a torque causes a rotation through an angle, the size of the angle can be expressed in degrees or in __________.
 

 

 169. 

An angle of one radian is equal to ____ degrees.
 

 

 170. 

Work done by a torque is equal to the torque applied times ________________________.
 

 

 171. 

Use foot-pounds and newton-meters to fill in the blanks of the following statement.
Work is measured in __________________ in the SI system and _________________ in the English system.
 

 

 172. 

40 N·m = ____ joule
 

 

 173. 

1 radian equals ____ degrees.
 

 

 174. 

One revolution is equal to ____ radians.
 

 

 175. 

One joule is equal to ____ Newton meters.
 

 

 176. 

Efficiency is expressed as output work divided by _________________.
 

 

 177. 

The SI unit of work is ____________.
 

 

 178. 

To figure mechanical work one must know the force and __________________________.
 

 

 179. 

Mechanical work is done when a force or torque ____________ an object.
 

 

 180. 

The formula for work is ________________.     
 

 

 181. 

Work can be calculated using __________ and ___________.  (Give two formulas)
 

 

 182. 

The work required to lift water from a lake to a tank above the lake is given by co182-1.jpg.  To find the pressure difference (Dp), the ___________ of the water must be known, as well as the height (h) of the lift.
 

 

 183. 

Mechanical work is done when a box is pushed onto a conveyor belt by the shaft of a hydraulic cylinder.  Fluid work is done when a motor-driven pump pressurizes the fluid that operates the piston connected to the shaft.  This is an example of the general idea of _________ as a unifying concept.
 

 

 184. 

In a fluid system, work is done when a __________________ causes liquid or gas to move.
 

 

 185. 

A closed fluid system is designed to retain and ____________ the fluid.
 

 

 186. 

A city water system is a(n) ______________ system.
 

 

 187. 

Winds blow because air moves from ______ pressure regions to ______ pressure regions.
 

 

 188. 

26 N·m is equal to ____ Joules
 

 

 189. 

___________ systems retain and recirculate fluids, while __________ systems move fluids, but do not retain or recirculate them.
 

 

 190. 

The weight density of water is __________.
 

 

 191. 

_______________________ causes work to be done in a fluid system.
 

 

 192. 

______________ and _______________ systems interact with fluid system to produce useful work.
 

 

 193. 

The equation for work done by a voltage is __________.
 

 

 194. 

6.25 1018 electrons is equal to a charge of __________.
 

 

 195. 

1 ampere-hour = ______ coulombs
 

 

 196. 

_________ occurs when a voltage difference caused a charge to move.
 

 

 197. 

Work equals a force-like quantity times a displacement, for electrical work.  The force-like quantity is ____________________ and the displacement quantity is __________.
 

 

 198. 

The general unifying equation for expressing rate is ______________________.
 

 

 199. 

The SI units, m/sec, describe a _________________.
 

 

 200. 

The rate at which a car moves is described as 35 mi/hr northeast.  The rate is a ___________ [velocity, speed] and is a __________ [vector, scalar] quantity. 
(Choose the correct word.)
 

 

 201. 

Average speed is determined by ________  the total distance traveled by the total time of travel.
 

 

 202. 

Velocities may be added together as numbers only if two or more velocity vectors are in the [same, opposite] direction.  (Choose the correct word.)
 

 

 203. 

A change of linear speed during an elapsed time is called an _________________.
 

 

 204. 

A negative sign in front of an acceleration value would indicate that the object is _______________.
 

 

 205. 

In the English system of units, ft/sec2 indicates a unit for _________________.
 

 

 206. 

A constant linear acceleration is a ___________ [uniform, nonuniform] speed change.  (Choose the correct word.)
 

 

 207. 

In rotating mechanical systems, displacement is given as the _______________ through which the body rotates.
 

 

 208. 

A 360° circle contains ____ radians.
 

 

 209. 

Clockwise (cw) and counterclockwise (ccw) motions are convenient ways to describe the direction of angular velocity of a _______________ object.
 

 

 210. 

When either a linear or angular speed is changing with time, the difference in speed per unit time is called the _______________________.
 

 

 211. 

The displacement in rotational motion is ___________________________.
 

 

 212. 

Velocity is a _________ quantity.
 

 

 213. 

Speed is a _____________ quantity.
 

 

 214. 

The equation to find average speed is ______________.
 

 

 215. 

The formula for finding linear acceleration is ________________________.
 

 

 216. 

When an object’s speed decreases it is called ____________.
 

 

 217. 

_________ is expressed as a rate involving distance traveled per unit of time.
 

 

 218. 

If speed is given, along with direction, this quantity is called ____________.
 

 

 219. 

A change in speed where an object’s speed is increasing would be called ____.
 

 

 220. 

The equation for finding volume-flow rate is __________________________.
 

 

 221. 

The 2 ways of measuring how much fluid is displaced is ____________ and ______________.
 

 

 222. 

A measured rate of cubic feet per minute would be an English unit measurement for _______________.
 

 

 223. 

Fluid moved is often called ____________ fluid.
 

 

 224. 

The fluid mass moving past a given cross section in the flow stream during a given time is the ____________ rate.
 

 

 225. 

Instruments used to read volume-flow rate and mass-flow rate such as a flowmeter are ___________________.
 

 

 226. 

Reduced flow rates inside the pipes in any fluid system is often caused by ______________.
 

 

Problem
 
 
A block and tackle is used to lift a load weighing 600 lb.  The operator lifts the load a distance of 1.25 ft by pulling on the rope with a force of 200 lb over a distance of 4 ft.
 

 227. 

Input work = ____ ft·lb
 

 228. 

A rusty nut moves with difficulty on an equally rusty threaded shaft.  It requires 5 lb of force continually applied a 10 inched from the center of the nut to turn the nut.  How much work is done in each revolution?
 

 229. 

A weight lifter raises a 100 N barbell a distance of 3 m.  Calculate the work done by the weight lifter.
 

 230. 

If 500 ft·lbs of work has been done and the object was moved 500 feet, what is the force?
 

 231. 

If a winch has a lever am of 2 feet and produces a torque of 6 ft·lbs, what is the applied force?  (Hint: use pr231-1.jpg)
 

 232. 

How much work is done in moving 200 cubic feet of water through a pressure difference of 5000 lb/ftpr232-1.jpg?
 

 233. 

Water is lifted from an underground water stream into a city water tower where the water is distributed within the city.  Using the weight of water to be 62.4 lb/ftpr233-1.jpg, what work must be done in lifting 2500ftpr233-2.jpg of water 120 ft from the underground stream to fill the pipe of the tower?
 

 234. 

A weight of 10 N displaces a piston filled with air 0.1 m.  If the change of volume in the piston is 0.05 m3, what is the pressure in the piston? 
(Hint: pr234-1.jpg.) 
(The piston is 100 % efficient.)
 

 235. 

What is the efficiency of a machine that has a work input of 4200 J and a work output of 3800 J?
 

 236. 

What quantity of charge (in coulombs) is moved within a circuit if 6.7 pr236-1.jpg 1021 electrons are transferred from one part of the circuit to another by a voltage applied to the circuit?
 

 237. 

A typical heavy duty battery might be rated at 750 amp-hours.  How many coulombs of charge can the battery provide?
 

 238. 

A 9-volt battery delivers 12 coulombs of charge.  How much work has it done?
 

 239. 

What is the speed of a car if it travels a distance of 350 meters in 11 seconds?
 

 240. 

After touching down on a runway, an airplane is brought to a stop in 15 seconds.  If the acceleration of the plane was a constant -4.5 m/s2, what was the speed of the plane at touchdown?
 

 241. 

Find the speed of a car that covers a 120-mile distance in 2 hours.  Remember to use proper labels.
 

 242. 

A car maintains a speed of 60 miles per hour for 5 hours.  How many miles will the car have traveled?
 

 243. 

A car moves 55 meters in 10 seconds.  Find the linear speed of the car.
 

 244. 

A car accelerates from stop to 10m/sec in 2 sec.  What’s the car’s acceleration? 
Use pr244-1.jpg.
 

 245. 

If it takes 6 minutes to fill a 30-gal aquarium what is the flow rate?  Use pr245-1.jpg.
 

 246. 

Find the mass-flow rate of a liquid that has a weight of 1800 lbs and fills in 30 sec?
 

 247. 

If a tank has a volume-flow rate of 20 gallons per minute and it runs for 20 minutes, how many gallons will be moved?
 

 248. 

A tank holds 5000 gallons of water.  It can be filled in 2.5 hours.  What is the volume-flow rate of water through the pipe in gallons per minute?
 

 249. 

At the gas station, if 10 gallons are pumped in 1.5 minutes, what is the volume-flow rate?
 

 250. 

A pipe has a radius of 5 centimeters and is 50 centimeters long.  A float takes 10 seconds to cover the 50-centimeter distance.  The water has a depth of 5 centimeters in the pipe.  What is the rate of flow of water in the pipe in  cm3/sec? 

The following formulas will be helpful:
area of a circle = pr250-1.jpg
volume = pr250-2.jpg
pr250-3.jpg
 



 
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