Gravitational Potential Energy
Kinetic Energy
Conservation of Energy
Thermal Energy
Energy Sources
Miscellaneous
100
What is the value, on Earth, of g (include units) in the formula E_p=mgh
g=9.8m/s^2
100
What is the speed 25 m/s when converted to km/h?
90 km/h
100
In your own words, what is the "Law of Conservation of Energy"?
Energy is neither created nor destroyed; it is converted from one form to another.
100
In the picture below, which object has more thermal energy, and which object has a higher temperature? Explain.
The object on the left has more thermal energy, because it has 27 J in total, while the right only has 20 J total.
The object on the right has a higher temperature, because it has higher energy/particle.
100
Give an example of a renewable energy source.
Wind, hydroelectric, solar, biomass, etc.
100
In the PHET Energy simulation we did in class, which two animals could be selected to ride a skateboard? (name both)
A cat and a dog
200
What is the gravitational potential energy of a 5.0 kilogram weight held 8.0 metres above the ground?
392 J
200
What is the kinetic energy of a 3 kg object travelling at 8 m/s?
96 J
200
A 45 kg object with 250 J of gravitational potential energy is dropped down a ramp and 9.2 seconds later it hits the ground. What is its kinetic energy when it hits the ground?
250 J
200
What are the three types of heat transfer?
Conduction, convection, and radiation.
200
Give an example of a non-renewable energy source.
Oil, natural gas, nuclear, etc.
200
Which planet in our solar system has the greatest value of g (acceleration due to gravity at surface)?
Jupiter
300
A 32 kg child is standing on top of a building and has 4390.4 J of gravitational potential energy. What is the height of the building?
14 metres
300
A student is running at 6.5 m/s and has 1521 J of kinetic energy. What is the mass of the student?
72 kg
300
A calculator is dropped from a height of 4.9 metres. What is its speed when it hits the ground?
9.8 m/s
300
How much energy is required to raise the temperature of 500 grams of water by 3°C? (c for water is 4184 J/kg*°C)
6276 J
300
Name at least one disadvantage of using coal as an energy source.
CO2 emissions lead to global warming, pollution, it's a non-renewable resource, etc.
300
How many μg (micrograms) are in 1 gram?
One million (1 000 000)
400
A ball is held 95 cm above the ground and has 18.62 J of gravitational potential energy. What is the mass of the ball?
2 kg
400
A 40 gram bullet is fired from a gun such that it has 5kJ of kinetic energy. What is the speed of the bullet?
500 m/s
400
Mr. Bellamy throws a student's mirror out the window at a speed of 15.0 m/s. The mirror hits the ground at a speed of 29.2 m/s. How high is the window? (round to the nearest metre)
32 metres
400
8437.5 kJ of energy is put into 15 kg of Aluminum, raising its temperature from 25°C to 650°C. What is the specific heat capacity of Aluminum? (include the correct units!)
900 J/kg*°C
400
What is the most common source of energy in Canada?
Hydroelectric power
400
Fill in the blanks:
"A microwave oven (電子レンジ) works by converting ______ energy into ______ energy, which is finally converted to _______ energy, which cooks the food."
"A microwave oven (電子レンジ) works by converting electrical energy into light energy, which is finally converted to thermal energy, which cooks the food."
500
A 1025 kg Mars rover climbs to the top of Olympus Mons, 22 km above the surface, and gains 83660.5 kJ of gravitational potential energy. What is "g", the acceleration due to gravity, for Mars?
3.71 m/s^2
500
A ball is thrown at a speed of 75 km/h so that is has 976.56 J of kinetic energy. What is the mass of the ball? (Round to the nearest tenth of a kilogram)
4.5 kg
500
What is the kinetic energy of a 2 gram marble at the top of a 25 cm tall loop, if it started by being thrown at 1.5 m/s from a 40 cm starting position?
0.00519 J
500
After 24574.5 J of energy was transferred into a 500g piece of gold, its temperature rose to 400°C. Given that the specific heat capacity of gold is 129 J/kg*°C, what was the original temperature of the gold?
19°C
500
What is the most common source of energy in Japan?
LNG (liquefied Natural Gas, i.e. methane/CH4)
500
Which element is the most common fuel for nuclear reactors?
Uranium
