An example of conversion of gravitational potential energy into kinetic energy is ____.
a falling raindrop
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5
Electromagnetic waves _____.
can travel through empty space
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15
A 0.49 kg squirrel jumps from a tree branch that is 3.6 m high to the top of a bird feeder that is 1.5 m high. What is the change in gravitational potential energy of the squirrel?
PE (tree) = 17.3 J PE (feeder) = 7.2 J Change in PE = 10.1 J
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5
The energy of a moving object is what type of energy?
kinetic
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baam
Lose 10 points!
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fairy
Take points!
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25
gift
Win 25 points!
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banana
Go to last place!
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5
The full range of frequencies of electromagnetic radiation is called _____.
electromagnetic spectrum
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15
A 4 kg cat is resting on top of a bookshelf that is 2 m high. What is the cat's gravitational potential energy relative to the floor?
PE = m•g•h = 78.4 J
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lifesaver
Give 20 points!
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star
Double points!
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rocket
Go to first place!
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banana
Go to last place!
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5
An example of an object having elastic potential energy is _______.
a stretched spring
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20
A 10 kg rock is dropped and hits the ground below at a speed of 60 m/s. Calculate the gravitational potential energy of the rock before it was dropped.
PE = KE = ½mv² = 18000 J
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thief
Give points!
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25
fairy
Take points!
5
10
15
20
25
shark
Other team loses 25 points!
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banana
Go to last place!
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5
An example of electromagnetic energy is ______
sunlight
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5
The law of conservation of energy states that _______.
energy cannot be created or destroyed
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5
Mechanical energy is _________.
the sum of the kinetic and potential energy of an object
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15
A small 30 kg canoe is floating downriver at a speed of 2 m/s. What is the canoe's kinetic energy?
KE = ½mv² = 60 J
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20
From what height would a 10 kg rock fall from if it had a gravitational potential energy is 18000 J.