Work, Power, and Energy — Test

Question 1

Suchita is going to make an energy transfer diagram to represent the energy transformations associated with the flame of a gas stove. The diagram will show that the chemical energy of the fuel transforms into 50 J of chemical energy, 400 J of heat, and 200 J of light. Which statement describes Suchita’s final diagram?

Revolt · Accepted Answer

The arrow for heat is the widest output arrow.; The arrow for chemical energy is the shortest output arrow.

Question 2

A 60 point 0 kilograms object is moving east at 8.00 meters per second , and then slows down to 4.00 meters per second How much work was done?

Revolt · Accepted Answer

negative 1 comma 440 cap j

Question 3

Which best summarizes Brandi’s statement about doing work while posing?

Revolt · Accepted Answer

She did no work because she did not move the scales or sword while she posed.; She did no work because she did not exert any forces on objects.

Question 4

This roller coaster’s track is nearly frictionless, so resistance can be ignored. Using g is equal to 9 point 8 the fraction with numerator m and denominator s squared , what best describes the roller coaster car when it is at the top of the loop-de-loop?

Revolt · Accepted Answer

The car has both potential and kinetic energy, and it is moving at 24.6 meters per second .

Question 5

What conclusion is best supported by Lamar’s work?

Revolt · Accepted Answer

The gravitational potential energy equals the work needed to lift the object.

Work, Power, and Energy — Test Answers

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