Chapter 15: Energy - Review and Practice | Baamboozle - Baamboozle

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What is the unit for ENERGY called?

Joule = (N • m ) = (kg•m/s² •m)

An example of conversion of gravitational potential energy into kinetic energy is ____.

a falling raindrop

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

What color is the object in the image? How do you know?

Green - it is the only color reflected (not absorbed) by the object.

The law of conservation of energy states that _______.

energy cannot be created or destroyed

Infrared rays have shorter wavelength than ______.

radio waves

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

Electromagnetic waves _____.

can travel through empty space

From what height would a 10 kg rock fall from if it had a gravitational potential energy is 18000 J.

PE = m•g•h , so: m = PE/m•g = 183 m

If the speed of an object doubles, it's kinetic energy ______.

quadruples

The visible light spectrum ranges between ________.

infrared and ultraviolet

A 12 kg sled is moving at a speed of 3.0 m/s. At which speed will the sled have about twice as much kinetic energy?

4.2 m/s

Using the image, describe at which end of the visible spectrum would you place RED? Which end would you place VIOLET?

RED - at the 'low energy end' of the visible spectrum (just after 'infraRED' and VIOLET - at the 'high end' of the visible spectrum (just before 'ultraVIOLET')

Mechanical energy is _________.

the sum of the kinetic and potential energy of an object

An example of an object having elastic potential energy is _______.

a stretched spring

Summarize the change in both wavelength and energy as you move from radio waves to gamma rays on the electromagnetic spectrum.

radio waves have long wavelength - therefore low frequency and low energy; gamma rays have short wavelengths - therefore high frequency and high energy

Energy stored in bonds between atoms is what type of energy?

chemical

The electromagnetic waves with the highest frequency are _____.

gamma rays

The full range of frequencies of electromagnetic radiation is called _____.

electromagnetic spectrum

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

The energy of a moving object is what type of energy?

kinetic

An example of electromagnetic energy is ______

sunlight

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