Post Test: Energy

The image shows street lights powered by solar panels. Which sequence shows the energy transformations taking place in these lights?

C

Which graphs show the correct relationship between kinetic energy and mass?

C

When is thermal energy added

- Kinetic energy increases - Particles move faster - Temperature increases

when is thermal energy removed

- Temperature decreases - Kinetic energy decreases - Particles move slower.

A book that weighs 0.35 kilograms is kept on a shelf that's 2.0 meters above the ground. A picture frame that weighs 0.5 kilograms will have the same gravitational potential energy as the book when it's raised to a height of _______ meters

1.4

What's the velocity of a ball falling with 100 joules of kinetic energy and a mass of 2 kilograms? Use the formula,

10 m/s

What's the velocity of an 11-kilogram object with 792 joules of kinetic energy?

12 m/s

Dina has a mass of 50 kilograms and is waiting at the top of a ski slope that's 5 meters high. The maximum kinetic energy she can reach when she skis to the bottom of the slope is

2,450

The image shows the path of a ball that's thrown.

A, G, D

When a pendulum is held high and taut and then is released, the pendulum begins to swing. What's the correct order of the energy transformations in this example? (PE stands for potential energy.)

B

John is riding a ski lift to the top of Wildcat Mountain. He removes his gloves and rapidly rubs his hands together to warm them up.

C

This glass of lemonade is sitting in the hot summer sun. As time passes, in which direction will heat transfer take place?

C

Five marbles roll down a ramp. Each marble reaches the bottom of the ramp at a speed of 3 meters/second. Which marble has the highest kinetic energy at the bottom of the ramp? The table lists the mass of each marble.

D

Jeff has 10 grams of water and 10 grams of vegetable oil in separate containers.

D

A worker is holding a filled gas cylinder still. Which two sentences are true about the energy of the filled gas cylinder?

It has gravitational potential energy because of its height. Its atoms and molecules have thermal energy.

Which two forms of energy does a hairdryer convert electric energy into?

Motion energy, Thermal energy

John is riding a ski lift to the top of Wildcat Mountain. He removes his gloves and rapidly rubs his hands together to warm them up. What happens when John rubs his hands?

The particles in his hands vibrate faster because of friction.

Jeff has 10 grams of water and 10 grams of vegetable oil in separate containers. Both liquids have a temperature of 24°C. Jeff heats both liquids over a flame for five minutes. When he's finished, he discovers that the temperature of the oil increased more than the temperature of the water. What can Jeff conclude from this experiment?

Vegetable oil has a lower heat capacity than water.

Which example best represents translational kinetic energy?

an apple falling from a tree

stored energy related to positions of atoms within molecules

chemical energy

Zoe is frying eggs in a pan. The eggs cook because of __________________ heat.

conduction

Which form of energy increases when a spring is compressed?

elastic potential energy

Kinetic Energy

energy from a flashlight when on energy of guitar string when plucked

Potential Energy

energy of a compressed spring energy of coal

energy related to height

gravitational potential energy

A tennis ball is hit into the air with a racket. When is the ball's kinetic energy the greatest? Ignore air resistance.

just before it reaches the ground

energy related to an object's movement

motion energy

energy released when a nucleus splits or combines

nuclear energy

A kiddie roller coaster car has a mass 100 kilograms. At the top of a hill, it's moving at a speed of 3 meters/second. After reaching the bottom of the hill, its speed doubles. The car's kinetic energy at the bottom is

quadruple, 1,800

Zoe feels hot as she stands near the stove mostly because of __________________ of heat.

radiation

energy generated by vibration of a string

sound energy

energy of motion of particles in a substance

thermal energy