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Practice Mid Year 2010

True/False
Indicate whether the statement is true or false. On the answer sheet let A represent True and B represent False.
 

 1. 

Weight is a measure of mass.
 

 2. 

Torque is rotation only in the counter clockwise (ccw) direction.
 

 3. 

Belts and wheels are mechanical parts that transmit forces.
 

 4. 

Force is a scalar quantity.
 

 5. 

A force can change the shape of an object.
 

 6. 

If opposing forces are equal it is balanced.
 

 7. 

Another term for balanced forces is equilibrium.
 

 8. 

The mass of an object is greater on earth than on the moon.
 

 9. 

Torque from one gear has to be applied to turn another gear.
 

 10. 

Fluids always move from regions of low pressure to regions of high pressure.
 

 11. 

If the weight of a ship is greater than the buoyant force the ship will sink.
 

 12. 

Gage pressure is the total pressure measured above atmospheric pressure.
 

 13. 

Hydraulics or liquids are the classifications of all fluid systems.
 

 14. 

A substance with a mass of 105 g and a density of 10.5 g/cm3 has a volume of 10 cm3.
 

 15. 

PSI is a unit of pressure.
 

 16. 

Atmospheric pressure is approximately 15 psi.
 

 17. 

Pressure is a vector quantity.
 

 18. 

The atmospheric pressure at sea level is 14.7 lb/intf018-1.jpg
 

 19. 

Liquids or gasses move in a fluid system when pressure difference exit between different points in the system.
 

 20. 

The electrical forces “rule of attraction” is “like charges attract and unlike charges repel”.
 

 21. 

Batteries produce AC.
 

 22. 

The main source of DC electricity is electrical generating plants.
 

 23. 

Temperature is scalar.
 

 24. 

When you take a temperature you actually are measuring the average energy of motion of the molecules of a substance.
 

 25. 

40° Celsius is very cold.
 

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

 26. 

When we use the English system of units, mechanical force is measured in pounds.  When we use metric (or SI) units, mechanical force is measured in ________________________.
a.
Newtons of kilogram-weight (N or kgw)
b.
Newtons per square meter (N/m2)
c.
pounds (lb)
d.
pounds per square foot (lb/ft2)
 

 27. 

A torque wrench has a lever arm that’s 18 inches long.  A force of 20 pounds is applied to the end of the wrench to tighten a bolt.  The torque applied is _________.
a.
40 lb·ft
b.
30 lb·ft
c.
360 lb·ft
d.
100 lb·ft
 

 28. 

If the forces shown are drawn to scale and F1 is equal to  80 N, what’s the magnitude of the resultant force R in the diagram?
mc028-1.jpg
a.
R = 100 N
b.
R = 140 N
c.
R = 70 N
d.
R = 200 N
 

 29. 

If a fluid system is classified as a hydraulic system, ________________________.
a.
it involves air
c.
it may involve oil
b.
it involves some type of gas
d.
it’s the same as a pneumatic system
 

 30. 

Buoyant force ______________________________________________________.
a.
always acts down on a floating object
b.
always acts upward on a floating object and is equal to the weight of the floating object
c.
is the same as the weight of an object that sinks when placed in water
d.
makes objects heavier when they are placed in water
 

 31. 

Pressure in fluid systems is defined as ________________________.
a.
force times the area upon which the force acts
b.
force divided by the area upon which the force acts
c.
force time the volume of the fluid
d.
force divided by the volume of the fluid
 

 32. 

_____________________ must exist between different points in a fluid system for liquids or gases to move in that system.
a.
Equal pressure
c.
Resistance
b.
Temperature stability
d.
Pressure difference
 

 33. 

Total or absolute pressure is the ________________________.
a.
product of gage pressure and atmospheric pressure
b.
sum of gage pressure and atmospheric pressure
c.
sum of buoyant pressure and atmospheric pressure
d.
sum of gage pressure and buoyant force
 

 34. 

______________ is the most common source of DC voltage.
a.
A DC battery
c.
A toaster
b.
A home wall-socket
d.
A 200-volt outlet
 

 35. 

Voltage can be thought of as a force-like quantity because it __________________.
a.
moves electrons through a circuit
b.
moves conductors in circuits
c.
is found in electrical circuits
d.
requires insulation on conductors in circuits
 

 36. 

In the electrical circuit with parallel loads shown here, the voltage measured across the source (Vs), when the switch is closed, is given by the equation _______________.

mc036-1.jpg
a.
mc036-2.jpg
b.
mc036-3.jpg
c.
mc036-4.jpg
d.
mc036-5.jpg
 

 37. 

The term, “115-volt AC, 60 Hz,” means that the voltage is 115 volts at he the alternating current ________________________.
a.
alternates or “cycles” 60 times per second
b.
changes direction 120 times per second
c.
has a frequency of 60 cycles per second
d.
all of these
 

 38. 

Heat always moves from regions of ___________________.
a.
lower to higher temperatures
b.
higher to lower temperatures
c.
small molecular vibrations to large molecular vibrations
 

 39. 

Temperature ________________________.
a.
is a scalar quantity
b.
is a measure of molecular motion
c.
depends on the presence or absence of heat energy
d.
all of these
 

 40. 

In the United States, temperature is often given in degrees Fahrenheit (°F).  The force-like quantity in thermal systems is temperature difference (mc040-1.jpg) and is measured in ________________.
a.
degrees Fahrenheit (°F)
b.
Fahrenheit degrees (F°)
c.
degrees Celsius (°C)
d.
calories
 

 41. 

A thermocouple measures _________________.
a.
pressure difference
b.
temperature
c.
heat energy in calories
d.
wire size
 

 42. 

When two forces of different magnitude act on an object in opposite directions, the object is in ____________________.
a.
a balanced condition
b.
an unbalanced condition
 

 43. 

A net force of zero means that all forces acting on an object create____________________.
a.
a balanced condition
b.
an unbalanced condition
 

 44. 

AC current _____________________________________.
a.
is available from an automobile battery
b.
moves back and forth in conducting wires
c.
always moves in one direction in a wire
 

 45. 

If two forces of the same magnitude act on an object along the same line, but in opposite directions, the object is said to be ____________________.
a.
speeding up
b.
in equilibrium
c.
slowing down
d.
unbalanced
 

 46. 

Using the scale of “one division = 20lb of force,” find the value of the resultant force (FR) in the diagram shown.

mc046-1.jpg
a.
50lb
b.
222N
c.
100lb
d.
600N
 

 47. 

Torque is defined as _____________________________________________________.
a.
the product of the length, measured in pounds, and the force, measured in feet
b.
the product of the force applied and the length of the lever arm
c.
the product of the force, measured in pounds, and the length, measured in Newtons
d.
the speed at which a body rotates
 

 48. 

The torque exerted on the driven gear in the following diagram is __________.  (Remember T = F´L.)

mc048-1.jpg
a.
22 lb·ft
c.
10 lb·ft
b.
40 lb·ft
d.
none of these
 

 49. 

The torque of a system whose force (F) is 30 lbs and length (L) is 2 ft is _________.
a.
60 lbs
b.
15 lbs
c.
60 lb·ft
d.
15 lb·ft
 

 50. 

Often opposing torques, like opposing forces, act on a rotating system.  If the clockwise and counterclockwise torques cancel each other, the system is said to be _________________.
a.
in equilibrium
c.
rotationally balanced
b.
out of balance
d.
torque off
 

 51. 

Which of the following is being described as a vector?
a.
0 degrees Celsius
b.
148 miles per hour, North
c.
125 Newton
 

 52. 

Heat moves ___________________.
a.
from cool areas to warm areas
b.
from warm areas to cool areas
 

 53. 

Weight can be measured with ______________.
a.
a spring scale
c.
a triple-beam balance
b.
a ruler
d.
a graduated cylinder
 

 54. 

The amount of matter that a certain object contains is called its _____________.
a.
weight
b.
toque
c.
vector
d.
mass
 

 55. 

The unit of force in the English system is the _________.
a.
pound
b.
Newton
c.
inch
d.
ft·lb
 

 56. 

Force is __________.
a.
a push
b.
a pull
c.
a vector
d.
both a and b
 

 57. 

If you were on the moon, your __________ would be the same as on the earth.
a.
mass
b.
weight
c.
torque
 

 58. 

In order to double the torque you could find a torque wrench with a handle __________________________.
a.
twice as long as the original wrench
b.
half as long as the original wrench
c.
three times as long as the original wrench
d.
you do not need to change the length of the handle
 

 59. 

The SI unit for force is ___________.
a.
pound
b.
Newton
c.
kilogram
d.
ft·lb
 

 60. 

If you push a lawn mower and it moves, the force on the lawn mower is ______________.
a.
balanced
b.
unbalanced
 

 61. 

Which of the following formulas is correct for torque?
a.
mc061-1.jpg
b.
mc061-2.jpg
c.
mc061-3.jpg
d.
mc061-4.jpg
 

 62. 

Torque is a _____________.
a.
straight line force
b.
rotational force
c.
not a force
 

 63. 

The unit for mass in the SI system is ___________.
a.
lbs
b.
lb·mass
c.
kg
d.
N
 

 64. 

_____________ is a measure of the earth’s gravitational pull on the object.
a.
Mass
b.
Weight
c.
Scalar
d.
Kilogram
 

 65. 

Torque equals the applied force times the lever arm.  What would the torque be if the force on the lever is 10 ft·lbs and the lever is 10 ft in length?
a.
10 ft·lb
b.
100 ft·lb
c.
0 ft·lb
d.
20 ft·lb
 

 66. 

What would be the resultant force on a machine if there is a pushing force of 10 ft·lbs in one direction and there is a pulling force of 10 ft·lbs in the opposite direction?
a.
100 ft·lb
b.
20 ft·lb
c.
10 ft·lb
d.
0 ft·lb
 

 67. 

Force is another name for ______________.
a.
motivation
c.
what Luke Skywalker tried to promise
b.
a push or a pull
d.
torque
 

 68. 

When forces are in equilibrium an object in motion ________________________.
a.
moves slowly
b.
could start to rotate
c.
slows down
d.
moves in a straight line at constant speed
e.
warms up
 

 69. 

Which of the following is a vector?
a.
time
b.
your age
c.
temperature
d.
force
e.
mass
 

 70. 

Indicate which of the following is an example of force in equilibrium.
a.
All forces acting on a body are equal
c.
A moving object continues moving at the same speed and in the same direction
b.
An object at rest remains at rest
d.
all of the above
 

 71. 

All fluid systems can be classified as either _______________________.
a.
solid or liquid
c.
pneumatic or hydraulic
b.
hydraulic or liquid
d.
pneumatic or gas
 

 72. 

If 10 cm3 of a substance has a mass of 105gm, what is its density?
a.
1050 gm/cm3
b.
1050
c.
10.5 gm/cm3
d.
10.5
 

 73. 

Which of the following is the most complete definition of buoyant force?
a.
The apparent weight of an object that floats in water.
b.
The upward force on an object that is equal to the weight of the fluid displaced by that object.
 

 74. 

A submarine is located at a depth of 100 feet.  If a column of sea water one foot high and one square inch in cross-sectional area weighs 0.443lb, what is the pressure exerted by the sea water n the submarine’s hull?
a.
100 lb/in2
b.
59.13 lb/in2
c.
29.73 lb/in2
d.
44.3 lb/in2
 

 75. 

A storage tank is filled to a depth of 25 feet with an alcohol that has a weight density of 58.5 lb/ft3.  What is the pressure at the bottom of the tank?  (Remember: mc075-1.jpg.)
a.
10.2 lb/ft2
b.
1462.5 lb/ft2
c.
46,800 lb/ft2
d.
325 lb/in2
 

 76. 

A simple U-tube manometer filled with mercury (mc076-1.jpg lb/in3) is connected between two bottles of gas with different pressures.  The difference in height between the two columns of mercury is 14.3 inches.  What is the difference in pressure between the two bottles of gas?  (Remember :mc076-2.jpg.)
a.
About 7 psi
b.
29.2 psi
c.
36.32 mm of Hg
d.
3.43 in/lb
 

 77. 

When the valve is opened between the two tanks shown here, in which direction will the fluid move?

mc077-1.jpg
a.
The fluid will move from left to right.
b.
The fluid will move from right to left.
c.
The fluid will not move at all.
d.
The fluid will move up in both tanks.
 

 78. 

A column of air that extends from sea level to the edge of outer space and has a cross-sectional area of one square inch ____________________________________. 
a.
weighs 14.7 lb
b.
is the cause of atmospheric pressure
c.
weighs about 2117 lb/ft2
d.
weighs the same as a column of water one square inch in cross section and is 33.92 ft high
e.
all of the above
 

 79. 

A net pressure is like a net force in that ______________________________________. 
a.
a net pressure causes fluid to move just as a net force causes objects to move
b.
a sealed container may change its shape due to a net pressure
c.
a net pressure is measured in units of Newtons, just like a force
d.
a and b
e.
a, b, and c
 

 80. 

A hydraulic system is a fluid system that uses _________ as the fluid.
a.
gas
b.
air
c.
liquid
d.
solid
 

 81. 

If you took an air pressure reading on your bicycle tires and read 50 lb/inmc081-1.jpg, you would be reading _________________.
a.
atmospheric pressure
c.
total pressure
b.
absolute pressure
d.
gage pressure
 

 82. 

The instrument used to measure gas pressure and pressure difference between two points in a system is a ________________.
a.
manometer
b.
tire gage
c.
hydraulic jack
d.
hydrometer
 

 83. 

The most likely fluid system to use in lifting a truck would be a __________________.
a.
pneumatic system
b.
hydraulic system
c.
thermal system
 

 84. 

The deeper an object goes underwater the greater the ___________.
a.
mass
b.
pressure
c.
volume
d.
density
 

 85. 

Absolute pressure is the ___________ pressure measured above a reference of zero pressure.
a.
above
b.
air
c.
total
d.
none of these
 

 86. 

______________ is a fluid system that uses air or gas as a fluid.
a.
Gage
b.
Density
c.
Pneumatic
d.
Hydraulic
 

 87. 

What is the English unit for density?
a.
lb/ftmc087-1.jpg
b.
lb/ftmc087-2.jpg
c.
kg/mmc087-3.jpg
d.
g/cmmc087-4.jpg
 

 88. 

If pressure = mc088-1.jpg then ____.
a.
mc088-2.jpg
b.
mc088-3.jpg
c.
mc088-4.jpg
 

 89. 

A hydraulic system is a system that uses ______________.
a.
gas as the fluid
b.
liquid as the fluid
c.
hydrogen as the fluid
 

 90. 

The specific gravity of a substance is the density of that substance divided by the density of water.  What is the specific gravity of gold (density = 19.3 g/cmmc090-1.jpg)?  (Remember the density of water is 1.0 g/cmmc090-2.jpg.)
a.
19.3
b.
19.3 g/cmmc090-3.jpg
c.
0.52
d.
0.052 g/cmmc090-4.jpg
 

 91. 

Which of the following statements about pressure is not true?
a.
Every pressure system contains a fluid—either a liquid or a gas.
b.
The pressure difference in the system causes a directional move.
c.
The pressure flows from high to low.
d.
Movement in a pressure system occurs when no pressure difference occurs.
 

 92. 

Pressure equals _________.
a.
mc092-1.jpg
b.
mc092-2.jpg
c.
mc092-3.jpg
d.
mc092-4.jpg
e.
mc092-5.jpg
 

 93. 

Which is not true of buoyant force?
a.
explains why objects float
b.
causes ice to melt in water
c.
explains why hot air balloons rise
 

 94. 

What substances are considered fluids?
a.
gases only
b.
liquids only
c.
gases and liquids
 

 95. 

Hydraulic systems use _________and pneumatic systems use _________.
a.
gas, liquid
b.
liquid, gas
c.
fluid, liquid
d.
gas, fluid
 

 96. 

An object will sink in water if its buoyant force is ___________________.
a.
less than its weight
c.
equal to its weight
b.
greater than its weight
d.
buoyant force makes no difference
 

 97. 

A tire gauge will measure _____________________.
a.
absolute pressure
b.
total pressure
c.
atmospheric pressure
d.
the amount of pressure above atmospheric pressure
 

 98. 

Voltage is considered a force-like quantity because it ________________________. 
a.
is found in electrical circuits
b.
pushes conductors around the circuit
c.
acts as a prime mover of electric charge
 

 99. 

Which of the following is NOT a type of voltmeter? 
a.
Panel meter
c.
Oscilloscope
b.
Digital thermometer
d.
Ohmmeter
 

 100. 

A class of batteries that are rechargeable is called ______________.
a.
primary cell
b.
secondary cell
c.
chemical cell
d.
dry cell
 

 101. 

Any material that permits the movement of electrical energy through it is called a(n) ________________.
a.
electrical load
b.
switch
c.
conductor
d.
electrode
 

 102. 

_____________ is the unit for voltage.
a.
Anode
b.
Amp
c.
Pascal
d.
Volts
 

 103. 

Which of the following is not an example of an electrical load?
a.
light bulbs
b.
television sets
c.
hair dryers
d.
batteries
 

 104. 

Movement of an electrical current in one direction through a conductor is called ___________________.
a.
current
c.
direct current
b.
alternating current
d.
indirect current
 

 105. 

In electrical systems, voltage acts as _______________.
a.
pressure
b.
energy
c.
work
d.
prime mover
 

 106. 

What is the frequency of the electricity we get from household outlets?
a.
120 volts
b.
60 volts
c.
120 hertz
d.
60 hertz
 

 107. 

Electrons flow from ______________________________.
a.
positive to negative
b.
negative to positive
c.
they don’t flow
d.
first negative to positive then positive to negative
 

 108. 

What type charge do electrons have?
a.
negative
b.
positive
c.
neutral
 

 109. 

If the temperature outside is 20° C, what is it in °F? 
Remember mc109-1.jpg, and mc109-2.jpg.
a.
68°F
b.
43°F
c.
72°F
d.
-6.7°F
 

 110. 

A thermocouple thermometer works because a voltage difference is generated between two junctions that are at different temperatures.  The two junctions are made of _______________________________.
a.
two pieces of wire of the same material
b.
three pieces of wire of the same material
c.
three pieces of wire of two different materials
d.
two wires made of different materials
 

 111. 

The temperature inside a house is 70 °F.  Outside the house the temperature is 40 °F.  The temperature difference is _________.
a.
30 F°
b.
30°F
c.
110 F°
d.
110°F
 

 112. 

Temperature is ____________________.
a.
a scalar quantity
c.
a vector quantity
b.
a measure of molecular motion
d.
both a and b
 

 113. 

Heat describes ___________ energy in matter.
a.
potential
b.
molecular
c.
electric
d.
nuclear
 

 114. 

Heat moves from regions of ______________________.
a.
lower to higher temperatures
c.
equal temperatures
b.
higher to lower temperatures
d.
extreme temperatures
 

 115. 

If the temperature outside is 35°C, what is it in °F? 
Remember °F = 32° + mc115-1.jpg°C and     °C = mc115-2.jpg(°F - 32).
a.
1.7 °F
b.
95 °F
c.
67 °F
d.
3 °F
 

 116. 

A thermocouple works because voltage difference is generated between two junctions that are of different temperatures.  The junctions are made of __________________________.
a.
two wires of different materials
b.
two pieces of wire of the same material
c.
three pieces of wire of the same material
d.
three pieces of wire of two different material
 

 117. 

Which is larger?
a.
b.
 

 118. 

The force-like quantity in thermal systems is _________________.
a.
an insulator
b.
a conductor
c.
heat continue
d.
DT
e.
molten steel
 

 119. 

What temperature measuring device can measure the temperature of molten aluminum?
a.
thermocouple
b.
liquid and glass thermometer
c.
thermostat
 

 120. 

Heat is a measure of what form of energy?
a.
temperature
b.
vibrating motion of atoms and molecules
c.
the sun
 

 121. 

What is the temperature difference or DT of 95°C and 62°C?
a.
30 C°
b.
157 C°
c.
0 C°
d.
33 C°
 

 122. 

Given that °F = mc122-1.jpg°C + 32, find the temperature in °F for a temperature of 12°C.
a.
42 °C
b.
38.6 °F
c.
53.6 °F
d.
21.6°F
 

 123. 

A thermocouple is used to ____________________________.
a.
measure a temperature difference
c.
confuse students
b.
find two people on a hot date
d.
measure the length of two wires
 

 124. 

Heat flows from _____________.
a.
hot to cold
b.
cold to hot
 

 125. 

The liquid in a thermometer ___________ as temperature increases.
a.
rises
b.
falls
c.
remains the same
 

 126. 

Which of the following is not true about temperature?
a.
Temperature is scalar (magnitude, but no direction).
b.
Temperature can be measured in degrees Celsius and Fahrenheit.
c.
Temperature depends on the presence or absence of heat
d.
Temperature is a descriptive word that refers to energy found in the vibrating molecules.
 

 127. 

A temperature-measuring device hat depends on changes in the electrical properties of certain metals for its operation is called a _______________.
a.
thermometer
b.
barometer
c.
thermocouple
d.
voltmeter
 

 128. 

In a room, heat from a space heater will travel __________________________________.
a.
from the warmer area around the heater, to the cooler area of the room
b.
from the cooler area of the room to the warmer area of the room
c.
from the ceiling to the floor
 

 129. 

The reason that we insulate our home is __________________________.
a.
to reduce heat loss in the winter
b.
to reduce heat gain in the summer
c.
both a and b
 

 130. 

Each degree on the Fahrenheit temperature scale is _________________ compared to a degree on the Celsius temperature scale.
a.
larger
b.
smaller
 

 131. 

If you want to heat a home with a wood stove the stove should be placed in a _____________ floor level for maximum benefit.
a.
higher
b.
lower
c.
doesn’t matter
 

 132. 

In the thermocouple lab, if you first use the multimeter and get a negative voltage reading what should you do?
a.
Use the reading and forget the negative sign.
b.
Reverse the probe leads on the multimeter.
c.
Change the battery in the multimeter.
 

 133. 

The molecular energy in matter is related to ________________. 
a.
its rate of heat flow
c.
its mass
b.
DT
d.
room temperature
 

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
 

 134. 

The total amount of matter contained in an object is known as its ___________.
 

 

 135. 

The prime mover of the mechanical energy system is __________.
 

 

 136. 

In describing vectors, arrow length represents ___________, and arrow heading represents ___________.
 

 

 137. 

The English unit for force is the pound. The System International (SI) unit for force is the ___________.
 

 

 138. 

A tire pressure gage measures air pressure in a 10-speed bicycle tire to be 55 lb/in2.  Atmospheric pressure is 14.7 lb/in2.  The absolute pressure of air in the tire is _______ lb/in2.  The gage pressure of air in the tire is _______ lb/in2.
 

 

 139. 

The U-tube manometer and spring scale are analogous measurement devices.  The spring scale measures _____________________.  The U-tube manometer measures ________________________.  In the spring scale, a spring will stretch a given number of inches for each pound of force applied.  In the U-tube manometer, the heights of the columns of mercury will change a given number of inches for each unit of _______________________.
 

 

 140. 

Give the equation for density.
 

 

 141. 

When we are talking about electron charges, we say that unlike charges ____________ each other and like charges ______________ each other.
 

 

 142. 

Heat always moves from regions of ___________ [higher, lower] temperature to regions of ___________ [lower, higher] temperature.  (Choose the correct words.)
 

 

 143. 

Force and force-like quantities in mechanical, fluid and electrical systems have certain analogies.  Similar analogies can be found in the thermal system.  The table below, partially filled in, shows some of these analogies.  (Fill in the remaining blanks.)

 
Mechanical
Fluid
Electrical
Thermal
Force or Force-like Quantity

FORCE

PRESSURE DIFFERENCE
  
Quantity Moved

MASS
 

ELECTRONS
 
 

 

 144. 

When you measure the average energy of motion of the molecules of a substance, you are measuring its _____________.     
 

 

 145. 

The symbol for temperature difference is ________.
 

 

 146. 

A measure of the average energy of motion of the molecules in a substance is termed _______________.
 

 

 147. 

A Celsius temperature difference of 40 degrees would be written as _____.
 

 

 148. 

Heat flows from _______ to _______.
 

 

Matching
 
 
For the following, match the words with their correct definitions.
a.
vector
b.
scalar
c.
mass
d.
weight
e.
torque
 

 149. 

A measure of the amount of matter contained in an object.
 

 150. 

A physical quantity described by both magnitude and direction.
 

 151. 

A physical quantity described only by magnitude
 

 152. 

A measure of gravitational pull.
 

 153. 

The product (result) of the force applied times the length of the lever arm. 
 
 
Identify the following vector situations as balanced or unbalanced forces. 
a.
Balanced
b.
Unbalanced
 

 154. 

A tug of war with 150 pounds of force pulling west and 150 pounds of force pulling east.
 

 155. 

A skydiver with parachute open floating down toward the ground at constant speed.
 

 156. 

A person siting still on a chair.
 
 
Match the following atmospheric pressure value with its respective system of units
a.
English
b.
SI
 

 157. 

760 mm mercury
 

 158. 

14.7 lb/in2
 
 
Match the description on the left with the correct phrase on the right.
a.
fluid
d.
density
b.
hydraulic system
e.
specific gravity
c.
pneumatic system
f.
pressure
 

 159. 

The density of a substance divided by the density of water
 

 160. 

The mass of a substance divided by the volume of that substance
 

 161. 

A fluid system that uses a gas a the fluid
 

 162. 

A fluid system that uses a liquid as the fluid
 

 163. 

A gas or liquid that conforms to the shape of its container
 

 164. 

Force divided by the area ma164-1.jpg
 
 
Match the term on the right with the correct description on the left.
a.
piezoelectric
d.
chemical
b.
static
e.
magnetic/mechanical
c.
thermocouple
f.
light
 

 165. 

uses an acid
 

 166. 

pressure in certain substance will cause electricity to flow
 

 167. 

composed of 2 different metals
 

 168. 

consist of magnetic field and a coil of wire
 

 169. 

produced by rubbing
 

 170. 

photovoltaic cell
 

Short Answer
 
 
nar001-1.jpg
 

 171. 

Is the block in the diagram shown in equilibrium?  Explain your answer.
 

 172. 

In your own words, explain why pressure is a scalar quantity rather than a vector quantity.
 

 173. 

Give the voltage that would be registered by a voltmeter for each of the circuits shown.

sa173-1.jpg     

V = ____ Circuit AV = ____ Circuit B
 

 174. 

Briefly describe one situation in which a technician is required to measure and apply force in some part of a mechanical system.
 

 175. 

Name two of the four things a force can do.
 

 176. 

A 4-12 pitch roof is common on many homes.  That means 4 feet of rise in a length of 12 feet.  Draw a scale drawing of this roof seen from the end of the house.
 

 177. 

Which of the following is a pressure unit? If it is a pressure unit, explain why you know it is.
a.  ft2/lb
b.  lb/in3
c.  N/m2
d.  kg/m2
e.  psi
f.  kg/in3
g.  lb/ft2
 

 178. 

If a substance has a specific gravity of 2.0, is it more or less dense than water?
 

 179. 

Briefly describe a circumstance that requires a technician to measure voltage.
 

 180. 

Describe the components of a thermocouple and its use in measuring temperature.
 

Problem
 

 181. 

If the density of aluminum is 2.7 gm/cm3, and the density of water is 1 gm/cm3, find the specific gravity of the aluminum.
 

 182. 

What’s the liquid pressure created in a hydraulic cylinder when a piston, of face area 7.06 in2, applies 40 lb of force to the liquid?
 

 183. 

Together, Misty and Jason are pushing a shopping cart down the middle of the grocery aisle.  John is applying 2 lbs of force while Jane is applying 4 lbs of force.  Calculate the magnitude and direction of the resultant.
 

 184. 

A torque wrench has a lever arm of 2 ft.  A force of 35 lb is applied to the end of the wrench to tighten a bolt.  What is the torque applied to the bolt?
 

 185. 

Make a scale drawing of a 40 lb force at 50 degrees to the floor.  Use a scale of pr185-1.jpg in = 10 lb of force.
 

 186. 

Sam is tightening a bolt.  She’s applying a force of 9 lbs through a lever arm of 1.5 ft.  How much torque is she applying?
 

 187. 

If the lever arm is 8 inches long and you apply 66 lbs of force to it what is the torque?
 
 
A boat is being used to travel on a river.  When the boat is being operated, it always travels at a speed of 25 km/h relative to the water.  The river on which the boat is being used flows at a constant speed of 10 km/h.  Use this information to answer the following question(s).
 

 188. 

When the boat is traveling downstream with the current, what is the speed of the boat relative to the banks of the river?
 

 189. 

Mercury in a container has a volume of 200 cmpr189-1.jpg and a density of 13.6 g/cmpr189-2.jpg.  Find the mass of the mercury in the container.
 

 190. 

The density of lead is 11.3 g/cmpr190-1.jpg, what is its specific gravity?
 

 191. 

The density of a substance is the mass of that substance divided by the volume o that substance.  What is the density of a 20 cmpr191-1.jpg object that has a mass of 60 grams?
 

 192. 

If the density of an object is 8.9 g/cmpr192-1.jpg, what is the specific gravity of that object?
 

 193. 

What would the pressure be on your body at the bottom of a swimming pool 10 feet deep?
 

 194. 

You weigh 150 lbs and you stand on one foot, which has an area of 30 inpr194-1.jpg.  Use the formula pr194-2.jpg to find the pressure you put on your foot.
 

 195. 

If the total pressure is 25 psi and the atmospheric pressure is 10 psi, what is the gauge pressure?  (use Ptot = Patm + Pg)
 

 196. 

An oven thermometer reads a temperature as 132°C.  The recipe book is written in °F.  What is that temperature in °F?
 

 197. 

The temperature of a skillet is measured to be 350°F.  What is its temperature in Celsius degrees?
 

 198. 

Temperature in degrees Fahrenheit is calculated by taking 1.8 pr198-1.jpg (°Celsius) + 32 degrees.  If it is 35 degrees Celsius outside, what is the temperature in degrees Fahrenheit?
 

 199. 

If the temperature was 20°C outside would you be wearing a scarf, gloves, and a winter coat?  (Change the degrees to Fahrenheit to determine your answer.  Show your work.
 

 200. 

80°C is what temperature in Fahrenheit?
 



 
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