Work, Energy, and Power

Work, Energy, and Power

10th - 12th Grade

5 Qs

quiz-placeholder

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Work, Energy, and Power

Work, Energy, and Power

Assessment

Quiz

Physics

10th - 12th Grade

Practice Problem

Hard

Created by

S Frans

Used 6+ times

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5 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

Media Image

A trolley runs from P to Q along a track. At Q its potential energy is 50 kJ less than at P.

At P, the kinetic energy of the trolley is 5 kJ. Between P and Q, the trolley does 10 kJ of work against friction.

What is the kinetic energy of the trolley at Q?

35 kJ

45 kJ

55 kJ

65 kJ

2.

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

A hydroelectric power station uses the gravitational potential energy of water to generate electrical energy.

In one particular power station, the mass of water flowing per unit time is 1.5 x 10^5 kg s^–1. The water falls through a vertical height of 120 m.

The electrical power generated is 100 MW. What is the efficiency of the power station?

5.6 %

43 %

57 %

77 %

3.

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

Which amount of energy is not 2400 J?

the decrease in gravitational potential energy of a mass of 60 kg when it moves vertically downwards through 40 m near the Earth’s surface

the energy transferred in 15 s by a machine of power 160 W

the kinetic energy of a mass of 12 kg moving at a speed of 20 m s^–1

the work done by a gas expanding against a constant external pressure of 120 kPa when its volume increases by 0.020 m^3

4.

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

A train of mass 300 000 kg is accelerating at 0.80 m s^–2. At one instant, the speed of the train is 5.0 m s^-1 and the resistive force to its motion is 15 kN. At this instant, what is the rate of increase of kinetic energy of the train?

0.075 MW

1.2 MW

1.3 MW

3.8 MW

5.

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

A ball is thrown vertically upwards. Air resistance is negligible.

Which statement is correct?

By the principle of conservation of energy, the total energy of the ball is constant throughout its motion.

By the principle of conservation of momentum, the momentum of the ball is constant throughout its motion.

The kinetic energy of the ball is greatest at the greatest height attained.

The potential energy of the ball increases at a constant rate during its ascent.