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


1.

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


2.

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


3.

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


4.

Liquids and gases tend to move from areas of lowpressure to areas of
highpressure.


5.

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


6.

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


7.

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


8.

The basic unit of an electrical charge is the coulomb.


9.

Voltage differences cause a charge to move.


10.

Electricity is not a very efficient way to transport energy.


11.

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.


12.

Speed is a scalar quantity


13.

The equation for linear speed is .


14.

The speed of an object is its velocity


15.

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


16.

is used to figure the time it takes to move a
volume.


17.

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


18.

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

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


19.

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 


20.

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


21.

An SI unit for work is _________.


22.

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 distance  c.  Work = pressure difference volume  b.  Work = torque angle
swept  d.  Work = voltage current 


23.

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


24.

The formula for calculating efficiency is ____________________.


25.

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


26.

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 


27.

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 


28.

GIVEN:      
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.


29.

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 


30.

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 


31.

Which of the following is not a SI system of measuring work?


32.

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. 


33.

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 


34.

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 


35.

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. 


36.

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 


37.

A pump lifts 2 cubic meters of water through a pressure difference of 200,000
N/m . 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 


38.

A hydraulic cylinder displaces 0.25 ft of oil while the piston moves a
distance of 1 ft. The pressure on the face of the piston is 60 lb/ft . 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 


39.

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


40.

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


41.

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


42.

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 


43.

An open fluid system moves fluids, but ____________ retain and recirculate the
fluids throughout the system.


44.

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


45.

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


46.

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 


47.

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 


48.

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 


49.

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


50.

Work done in fluids can be calculated by using which of the following?
(Note: there may be more than on correct answer.)


51.

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


52.

The coulomb is a unit of electrical charge that’s equal to
_______________.
a.  one ampere  c.  60 ampereseconds  b.  the charge on 6.25 10
electrons  d.  one
amperesecond 


53.

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


54.

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 


55.

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


56.

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) time( t).
a.  8 coulombs  b.  5.5 coulombs  c.  55 coulombs  d.  200
coulombs 


57.

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


58.

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


59.

Electrical work is equal to _________________________.
a.  volts force  c.  volts
coulombs  b.  coulombs mass  d.  joules
coulombs 


60.

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


61.

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


62.

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


63.

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


64.

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 


65.

A coulomb of charge is equal to _________________________.
a.  6.25 10^{18} electrons  b.  a unit of electrical
charge  c.  represented by q in the equation  d.  all of
these 


66.

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 


67.

In the formula , 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 


68.

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


69.

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 


70.

One joule is equivalent to ______________.
a.  1 voltcoulomb  b.  1 radian  c.  1
amperehour 


71.

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 


72.

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


73.

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


74.

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 


75.

360 degrees is equal to _______ radians.


76.

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


77.

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


78.

Which of the following equations best defines velocity?


79.

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


80.

Which symbols are used in linear equations?


81.

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


82.

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


83.

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


84.

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


85.

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


86.

If a leak in a faucet causes a water loss of 120 gallons in two days,
what’s the volumeflow 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 


87.

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


88.

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.  volumeflow rate  c.  neither a nor b  b.  fluid speed control  d.  both a and b 


89.

Common units for volumeflow rate are _____________.
a.  m^{3}/sec  b.  ft^{3}/sec  c.  gal/min  d.  all of
these 


90.

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 volumeflow 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 


91.

An air conditioning system pumps 10 lbs of Freon through the system in 4
minutes. Find the massflow 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 


92.

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 


93.

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 


94.

The equation for mass flow rate is ____________________.


95.

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.  1.08 104
gal  d.  5.37 104 gal  e.  6.48 105
gal 


96.

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


97.

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 

Problem


98.

A simple mechanical winch has a crank handle one foot long. A force of 10
lb is required to turn the crank. How much work is done in turning the crank through 1
revolution? (Remember that Torque = Force Lever Arm.)


99.

How much work is done when a 150 lb student climbs up twenty five 8 inch
stairs?


100.

A crane lifts a 2800 N concrete conduit 3 meters high. Calculate the work
required for this job.


101.

A manual car jack requires 1750 ft·lb to do its job. The result of
this work input is that 1500 lb of car is raised off the ground 1 foot. What is the efficiency
of the jack?


102.

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?


103.

Find the efficiency if output work equals 300 lb and input work equals 900
lb.


104.

Find the efficiency of a block and tackle when 2000 ft·lbs of work was used
to do 1700 ft·lbs of work.


105.

Find the amount of work done when a 60 lb weight is moved 5 ft.


106.

A wheel diameter is 1 ft and a force of 60 lbs is applied. What is your
torque?



Terri is going to lift an engine block off the floor using a block and
tackle. She puts in 1,200 ft·lb of work. The 600 lb engine block is raised 1.8
ft.


107.

Use to calculate output work.


108.

Use % eff = to find percentage efficiency.


109.

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


110.

A weight lifter is pushing on a wall with a force of 100 N. But as hard as
the weight lifter pushes, the wall doesn’t move. How much work has the weight lifter done
on the wall?


111.

Work = Force Distance. How much work is done if a dog pulls
a sled (100 lbs) a distance of 60 feet?


112.

If a winch has a torque of 10 N·m applied through an angle of 180°,
what is the input work? If the winch is lifting a 3 kg mass 1 meter, what is the output
work? What is the efficiency of the winch?


113.

A hydraulic cylinder moves a piston 25 cm while applying a constant force to a
load. The pressure of the oil within the cylinder is 50,000 N/m . The face of
the piston has an area of 3.5 cm . What work is done by the cylinder in making
this move?


114.

In order for a room to have proper ventilation, a fan is used to move fresh air
into a room—forcing the stale room air to the outofdoors. Each hour the fan causes a
complete change of the room air. The fan provides a force of 20 lb/ft . For a room
having dimensions of 30 ft 12 ft 10 ft, what work will be done each
hour by the fan?


115.

How much work must a water pump do to fill a 100 cubic foot tank that is 75 feet
above a lake?



A hydraulic cylinder moves a piston 0.12 m while pushing a mechanical
load. The fluid pressure on the piston face is 4000 N/m^{2}. The area of the
piston face is 0.0012 m^{2}.


116.

Find the volume (DV) and convert V =
AL.


117.

Use the formula to calculate the work done to displace 0.05
m ^{3} of fluid in a hydraulic jack under a constant pressure of 50,000
N/m ^{2}.


118.

When you blow out a candle, you blow 0.001 m ^{3} of air under a pressure
of 1,000 N/m ^{2}. How much work did you do on the air? (Use .)


119.

One hundred pounds is to be lifted by a cylinder of diameter 1.5 inches.
What pressure must be applied into the cylinder?


120.

What is the pressure exerted by a 40 N force on a piston that has a diameter of
4 cm? (Hint: and .)


121.

If a current of 1 amp flows for 60 seconds, how much charge has moved by?
Use .


122.

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


123.

In pumping water, an electrical pump consumes 4500 J of energy while doing 3500
J of work. What is the efficiency of the pump?


124.

A typical flashlight “D” cell can move about 3 coulombs of charge
using 1.5 volts. How many joules of work can the battery do?


125.

How much work does a heating element on a stove top do in 1 second if the
voltage is 220 volts and the current is 10 amps?


126.

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/s^{2}, what was the
speed of the plane at touchdown?


127.

Determine the angular speed of the second hand of a clock in rad/s.


128.

A car is being driven at a constant speed along a street when the driver of the
car decides to speed up in order to pass another car. Find the acceleration of the wheels in
rad/s^{2} if the wheel rotation increases from 5.5 rev/s to 8.8 rev/s in a time of 7.2
s.


129.

You traveled 400 miles in 8 hours. What is your average velocity?


130.

A car traveling at 29.4 ft/sec increases its speed to 88.1 ft/sec in 5
seconds. Find its acceleration.


131.

A car travels 100 miles in two hours, what is its average speed? ( )


132.

A pilot increases the speed of an aircraft from 0 mi/hr to 200 mi/hr in 10
minutes. What is the acceleration in mi/hr?


133.

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


134.

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


135.

An automobile flywheel is rotating at 1000 rpm. What’s its rate of
rotation in rad/sec?


136.

If a car travels 120 miles in 2 hours at 60 mph, which variables represent the
rate the car travels?


137.

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


138.

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


139.

You have 60,000 m^{3 }of oil that is moved using a hose with a
Q_{v} rate of 400 m^{3}/min. How long will it take to move the
oil?


140.

500 kg of air is circulated through a room by an air conditioner in 10
minutes. What is the massflow rate of the airconditioner?


141.

A tank holds 100 gallons of gasoline. It takes 10 minutes to pump the tank
dry. Determine the volume flow rate.


142.

150 kg of ammonia gas flows through the cooling coils of a refrigerated truck in
3 minutes. Find the mass flow rate of the gas.


143.

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


144.

The tank on a firetruck holds 2500 gallons of water. What must be the
pumping rate, in gal/s, if this water is to maintain a steady stream for 3 minutes?


145.

If the pump that unloads an oil supertanker can pump 48,000 gallons of crude oil
in one hour, what is the pump’s volumeflow rate in gal/min?


146.

If a 144,000 gallon swimming pool empties at the rate of 25 gallons per minute,
how long will it take for the pool to empty?


147.

The calibration equation for an orifice flow plate is: .
The flow rate, Q_{v}, has units of gallons/min, and Dp has units of inches of water pressure. What should the Dp be to have a flowrate of 1000 gallons/min? (Hint: to solve for
Dp, square both sides of the equation first.)


148.

A pipe has a radius of 5 centimeters and is 50 centimeters long. A float
takes 10 seconds to cover the 50centimeter distance. The water has a depth of 5 centimeters in
the pipe. What is the rate of flow of water in the pipe in cm ^{3}/sec?
The following formulas will be helpful: area of a circle = volume =
