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WorksheetsPS TEST 3: Energy and Heat S2
Total questions: 76
Worksheet time: 47mins
What is the equation for speed?
S = D/t
S = D x t
S = t x D
S = t / D
Acceleration equation?
a= vf - vi / t
a = F / m
none of the above
Force or weight equation?
F= m . a
w = m . g
none of the above
Work equation?
W= F . d
W = m . g
W = F / t
none of the above
power equation?
Power = Work /time
Power = Work /temperature
Power = Weight/time
none of these
momentum equation?
HINT: Kg m/s
p = m . V
P = W/t
P = I. V
None
Total mechanical Energy equation?
TME = Potential Energy + Kinetic Energy
TME = Power + momentum
Gravity is a constant used to find the weight of an object. using the equation Weight = m . g. If you have 20 Kg as the mass of the object, what number do you use for gravity?
9.8 m/s2
9.8 m/s
9.8 m
0 m/s2
True or False:
Kinetic Energy = 21m . v2 Joules
Potential Energy = m.g.h Joules
True
False
________energy is stored in a spring.
Elastic Potential
Kinetic
Gravitational Potential
Which of the following could be used to convert light energy to electrical energy?
a chemical storage battery
rotating coils in a magnetic field
a solar cell
a windmill
Gravitational potential energy depends on the ____
the acceleration due to gravity.
the mass of the object.
the height of the object.
all the above
Which correctly identifies the mass and approximate weight of the same object on Earth?
20-kg mass, 196-N weight
20-kg mass, 19,600-g weight
20-N mass, 2-kg weight
20-N mass, 196-g weight
Which of the following situations violates the law of conservation of energy?
A ball dropped from the top of a building increases in speed until it hits the ground.
A block sliding freely on level ice increases in speed until it hits a wall.
A child playing on a swing moves fastest at the bottom of the swing’s path.
The height a ball bounces decreases with each bounce
An inclined plane is used to move a heavy box from the ground into the bed of a truck. If 100 N of force is required to move the load up the ramp, how much work is done? Disregard any force of friction.
Hint: Work = Force . distance
1 N.m = 1 J
400 J
500 J
600 J
30 J
Where does the ball have the most kinetic energy?
A
B
C
D
What is the height of the object at C?
4.1 m
8.2 m
28 m
none of them
What is happening to the potential energy of the ball as it is falling
decreasing
increasing
staying same
none
What is the mass of the object?
HINT: PE = m. g. h
5 kg
25 kg
2 kg
none
Where does the object have both potential and kinetic energy not equal to zero?
A and D
B and C
A and B
C and D
What is the kinetic energy of the object at C?
HINT:
TME = KE + PE
980 J
200 J
50 J
780 J
A 50 kg object starts from rest at a height 30 m above the ground. Where does the skier have the most speed?
A
B
C
A=B=C
A 50 kg object starts from rest at a height 30 m above the ground. What is the mechanical energy of the object at A?
7350 J
14,700 N
14700 J
7350 N
A 50 kg object starts from rest at a height 30 m above the ground. What is the potential energy of the object at B?
4900 J
490 J
4900 N
none of them
A 50 kg object starts from rest at a height 30 m above the ground. The energy graph for the object at B is __________.
none
How much heat energy does it take to raise the temp of the 0.250 kg water at 100 o C to steam at 100 o C? (Heat of Vaporization = 2260000 J/kg )
565000 J
125,000 J
52,350 J
104,650 J
B is heat transferred to the handle. This is an example of heat transfer by_____.
conduction
convection
radiation
Through which of the following will convection most likely occur?
solids
solids and liquids
solids and gases
liquids and gases
A is heat coming from the heating coils. The pot is not touching the coils. This is an example of heat transfer by_____.
radiation
convection
conduction
none of the above
The transfer of energy that does not require matter is ____.
radiation
convection
conduction
none of the above
Radiation is the transfer of energy in the form of _______.
waves
signals
current
surges
Energy from the sun travels to Earth as ____.
radiant energy
mechanical energy
chemical energy
combustion
C is heat transfered to entire liquid in the pot which is not touching the coils. This is an example of heat transfer by_____.
convection
conduction
none of these
radiation
Object 10 kg object A at 100 oC is in contact with an 120 kg object B at 100 oC. Heat will
will not flow
flow from A to B
flow from B to A
none of these
When is the ball’s potential energy increasing?
A to D
B to F
D to G
none of these
When does the ball have the most kinetic energy?
A and G
D
B and F
none of these
When does the ball have the most potential energy?
A and G
D
C and E
none of these
A .050 kg of water at 20 oC is mixed with .075 kg of water at 100 oC. The equilibrium temperature of the mixture is 70 oC. (specific heat of water = 4186 J/kg oC). How much heat is gained by the cold water in this experiment?
10,465 J
15,698 J
30,090 J
40 J
The S.I unit of temperature is _______.
K
oC
oF
None of these
_______ is the measure of how hot or cold something is.
Temperature
specific heat
Radiation
Heat
Which of the following can be measured with a thermometer?
temperature
radiation
heat
all of the above
A measure of the average kinetic energy of the particles in a sample of matter is its ________.
temperature
heat
kinetic energy
potential energy
If molecules of a liquid gain enough kinetic energy to break free from intermolecular forces and become a vapor, we call this process ___________. (No heat is supplied)
evaporation
condensation
equilibrium
freezing point
Which of the following statements is true?
Heat flows from a higher temperature to a lower temperature.
The amount of heat in a closed system is a constant.
Heat is energy that is flowing into an object
Heat is energy that flows from a lower temperature to a higher temperature.
What is the freezing point of the substance? (Be careful with the units)
333 K
60 K
393 K
283 K
Between which two points is Heat of Vaporization?
A <----> B
B <----> C
C <----> D
D <----> E
E <----> F
A metal with a specific heat of 80 J/kg oC requires 900 J of heat to raise its temperature by 4 C. What is its mass?
2.8 Kg
8.2 Kg
3 Kg
100 Kg
Object 10 kg object A at 100 oC is in contact with an 120 kg object B at 100 oC. Heat will
will not flow
flow from A to B
flow from B to A
none of these
Object 10 kg object A at 100 oC is in contact with an 120 kg object B at 1 oC. Heat will
will not flow
flow from A to B
flow from B to A
none of these
A .050 kg of water at 20 oC is mixed with .075 kg of water at 100 oC. The equilibrium temperature of the mixture is 70 oC. (specific heat of water = 4186 J/kg oC). How much heat is lost by the hot water in this experiment?
9,419 J
15,698 J
20,718 J
6,279 J
Gravitational potential energy depends on the ____
the acceleration due to gravity.
the height of the object.
the mass of the object.
All of the above
Thermal energy is measured in units of ____.
Joules (J)
Celsius
Kelvin
Fahrenheit
75 oF = ? oC
HINT: oC = 5/9 (oF -32)
24 oC
42 oC
12 oC
28 oC
The law of ____ states that energy in a system can change forms but can never be created or destroyed.
conversion of energy
conservation of energy
consecration of energy
construction of energy
As the temperature of a material decreases, the particles move _________ and their kinetic energy __________.
slower ; decreases
slower ; increases
faster ; increases
faster ; decreases
How much heat energy does it take to completely change 8.5 kg of ice cube at 0 oC to water at 0 oC? (Heat of Fusion of ice = 334000 J/kg)
2.84 x 106 J
2,839 J
2.8 J
None of the above
If the velocity of an object triples, the KE of the object will ___________.
increase 9 times
increase 6 times
increase 3 times
decrease 9 times
If the velocity of an object doubles, the KE of the object will ___________.
increase 4 times
increase 2 times
increase 0 times
decrease 4 times
A material that reduces the flow of heat by conduction, convection, and radiation is a(n) ____
insulator
radiator
solar collector
conductor
250 oC = ? oF
HINT: oC = 5/9 (oF -32)
482 oF
171 oF
530 oF
32 oF
A slice of bread contains about 419000 J of energy. If the specific heat of a person is 4190 J/kg·°C, by how many degrees Celsius would the temperature of a 70 kg person increase if all the energy in the bread were converted to heat?
1.43°C
1.86°C
1.00°C
2.25°C
Silver, copper, and nickel are examples of _______.
good conductors
insulators
super conductors
bad conductors
All of the following are good conductors of heat EXCEPT ____.
air
aluminum
silver
copper
What is happening to the substance at line segment D-E ?
Boiling
melting
condensation
freezing
During which part is melting happening?
B to C
C to B
D to E
E to D
When is there a change in the potential energy of the molecules (hint: Phase change)? Pick two answers.
BC
DE
EF
AB
CB
What is the boiling point of the substance? (Be careful with the units)
393 K
283 K
393 J
120 J
100 oC
When is there an increase in kinetic energy of the molecules? Pick three answers.
AB
CD
EF
DE
BC
Which of the following Graph represents position 4 of the pendulum.
Which of the following Graph represents position 3 of the pendulum.
Which of the following Graph represents position 1 and 5 of the pendulum.
