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38 questions
A change from one form of energy into another is called:
Work
Power
Energy transformation
Conservation of energy
What is efficiency?
The total amount of energy lost
The % of energy lost as heat
The % of energy used to perform work
How long it takes for energy to be conserved
Which of the following is an example of an energy-efficient device?
Loudspeaker
Incandescent light bulb
Gasoline-powered car
LED bulb
Energy is transferred from the sun to solar panels through the process of:
Radiation
Convection
Conduction
All of the answers are correct
How can moving water produce electricity?
It is used to turn a turbine in a dam
The energy from the evaporation of water is used to produce heat
Water in plants is used to create conduction currents
The kinetic energy from fish that swim into a dam is captured and stored
Which of the following best describes how wind power is captured?
It is captured through the blades on a wind turbine.
It is captured through solar panels on the blades of a windmill
It is captured through convection currents in the air
All of the answers are correct
Energy due to the motion and position of an object is:
Mechanical Energy
Heat Energy
Kinetic Energy
Potential Energy
Suppose three people were going sledding. What is one way to increase their gravitational potential energy?
Wax the runners on the sled
Pull faster
Find a taller hill
Wait until the snow is deeper
What form of energy increases as a sled moves down a hill?
Potential energy
Kinetic energy
Nuclear energy
Elastic potential energy
A battery is added to a circuit to light up a bulb. What two types of energy are involved?
Chemical and electrical
Thermal and solar
Mechanical and chemical
Electrical and kinetic
On A recent camping trip, Destiny was making smores by the campfire and was using a metal stick to roast the marshmallows. When she placed the stick in the fire, it became too hot to hold. What type of heat energy transfer was occurring?
Conduction
Convection
Radiation
Conventional
Sebastian and his brother have bunk beds in their bedrooms. Sometimes Sebastian, in the upper bunk, gets much warmer than his brother in the lower bunk. What type of energy transfer does this illustrate?
Conduction
Convection
Radiation
Kinetic
Energy of a rock perched on a cliff is an example of...
Gravitational potential
Elastic potential
Chemical potential
Kinetic
The SI unit of work is?
Joules
Watts
Newtons
Meters
If 150 Joules of work is needed to move a box 10 meters, what force was used?
1500 N
15 N
1.5 N
150 N
If 68 Joules were necessary to move a 4 Newton crate, how far was the crate moved?
272 m
17 m
17 cm
272 cm
Which statement illustrates work done?
A weightlifter holds a barbell above her head
A teacher applies a force to a wall and becomes exhausted
A rolling marble hits a note card and moves it across a table
A waiter carries a tray full of meals across a dining room at a constant speed
A crane lifts an 8-m long steel girder weighing 2600 N up 15 m off the ground. The crane did ___ of work.
0 J
39,000 J
20,800 J
2,600 J
In what situation can energy be created or destroyed?
In a nuclear reaction
During photosynthesis
When work is done
Never
What is the efficiency of a machine if 55.3 J of work are done on the machine, but only 14.3 J of work are done by the machine?
0.258 Joules
25.8%
41.0 Joules
41.0%
What is the work output of a machine that has a work input of 2,800 Joules and an efficiency of 90%?
252,000 J
2,520 J
0.31 J
31.0 J
In energy transformations, "wasted energy" usually takes what form?
Heat energy
Chemical energy
Light energy
Electrical energy
At which point on the roller coaster is the kinetic energy at its maximum?
A
B
C
D
In the diagram, if the mass of the car is 600 kg, what is the change in gravitational potential energy from point A to point B?
294,000 J
- 294,000 J
117,600 J
-117,600 J
In physics, work is:
A transfer of energy by a force to move and object
Something you get paid for
Something you take home
Something that makes you sweat
A crate is picked up by a crane to a height of 50 m. The crate falls. What is the velocity of the crate just before it hits the ground?
Can't be calculated without the mass
980 Joules
980 m/s
31.3 m/s
When the velocity of an object triples, its kinetic energy increases by ______ times.
9
3
1.5
6
Latent heat is:
The heat absorbed or released by an element on the periodic table
The heat absorbed or released at a constant temperature during a change of phase
The heat needed to raise the temperature of 1 kg of a substance by 1K
The heat needed to transform ice into vapour
The amount of heat required to change the phase of a substance depends on two factors which are:
Surrounding temperature
The temperature change
The material
The mass
Water molecules have the greatest kinetic energy in
Ice at 0 ⁰C
Water at 90 ⁰C
Water at 373 K
Steam at 150 ⁰C
Name the process at QR
Melting
Boiling
Condensation
Freezing
Janae poured some hot chocolate into a cup and stirred it with a metal spoon. She noticed the spoon was really warm. What is the best explanation for this?
The spoon is a conductor.
The spoon reflects heat.
The spoon is an insulator.
She touched the spoon first and waited to touch the cup.
The amount of energy required to raise the temperature 1ºC for every kilogram is called____?
Thermal energy
Specific heat capacity
Temperature
Kinetic energy of molecules
The diagram shows a heating curve for ice. Which line represents the ice melting?
A
B
C
D
E
The specific heat capacity of platinum is 0.133 J/g°C. How much heat (Q) is released when a 10 g piece of platinum cools from 100°C to 50°C?
66.5 J
665 J
6.65 J
0.665 J
The specific heat capacity (c) of copper is 0.39 J/g °C. What is the temperature change (∆t) when 100 J of heat (Q) is added to 20 g of copper?
12.82 °C
24.12 °C
1.95 °C
51.28 °C
How much energy is required to melt 2000 g of mercury? (Latent heat of fusion is 1.14×104 J/kg)
2.55 x 104 J
2.28 x 104 J
2.82 x 104 J
3.28 x 104 J
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