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

0%

0 0 0

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

electromagnetic spectrum

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

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

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

An example of electromagnetic energy is ______

sunlight

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

a stretched spring

Infrared rays have shorter wavelength than ______.

radio waves

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

quadruples

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

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

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

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

chemical

Electromagnetic waves _____.

can travel through empty space

What is the unit for ENERGY called?

Joule = (N • m ) = (kg•m/s² •m)

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 law of conservation of energy states that _______.

energy cannot be created or destroyed

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

kinetic

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

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')

The electromagnetic waves with the highest frequency are _____.

gamma rays

The visible light spectrum ranges between ________.

infrared and ultraviolet

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

a falling raindrop

Mechanical energy is _________.

the sum of the kinetic and potential energy of an object

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