Unit Test — Unit test Answers

Doubling which quantity would cause the largest increase in a spring’s elastic potential energy?

What energy transformation occurs when a skydiver first jumps from a plane?

The diagram shows a side view of a skateboard ramp.

Which best identifies the requirements for work to be performed?

Which statement about work and power correctly describes an automobile race?

Four vehicles are traveling on the same road. Which vehicle most likely has the greatest kinetic energy?

What is the basis for analyzing an energy transfer diagram?

Kinetic energy is the energy an object has due to its .

Which energy transformations occur when a candle burns?

A famous motorcycle company has just built its first electric model. Like all vehicles, the purpose of the motorcycle is to put out kinetic energy.

Tracy makes a list of energy transformations that occur as an engine runs to power a car.1. Chemical energy transforms into thermal energy.2. Thermal energy transforms into electrical energy.3. Chemical energy transforms into gravitational potential energy.4. Thermal energy transforms into kinetic energy.

What does it mean when work is positive?

Hiro walks up a flight of stairs in his apartment building. Later in the day, he runs up the same flight of stairs.

A blender takes in 180 J of electrical energy. Of the 180 J, 90 J are transformed into kinetic energy, 60 J are transformed into thermal energy, and the rest is transformed into sound.

The chart shows data for four different moving objects.

A 535 kg roller coaster car began at rest at the top of a 93.0 m hill. Now it is at the top of the first loop-de-loop.This roller coaster’s track is nearly frictionless, so resistance can be ignored. Using g = 9.8 m/s2, what best describes the roller coaster car when it is at the top of the loop-de-loop?

According to the work-energy theorem, the amount of work done can be determined using which formula?

When energy is changed from one form to another, some of the energy is lost to the surroundings as waste thermal energy. The more steps needed to arrive at the desired energy or the more types of energy that are generated, the more energy is wasted.

Which change would cause the largest increase in a mountain climber’s gravitational potential energy?

A 440 kg roller coaster car is going 26 m/s when it reaches the lowest point on the track. If the car started from rest at the top of a hill, how much higher was that point on the track than the lowest point? (Use g = 9.80 m/s2, and ignore friction.)