Question 1

If a man pushes a wall with a force of

300 N

for

10

minutes but the wall remains stationary, what is the total work done based on the scientific definition of work?

Accepted Answer

Zero Joules

Answer

180000 Joules

Answer

3000 Joules

Answer

30 Joules

Question 2

An object of mass

300 N

is lifted vertically through a height of

10

. Calculate the work done against gravity. (Assume

g = 9.8 m/s^2

)

Accepted Answer

98 J

Answer

49 J

Answer

10 J

Answer

19.6 J

Question 3

A girl carries a heavy box on her head and walks

300 N

along a horizontal road at a constant velocity. What is the work done by the girl against the force of gravity?

Accepted Answer

0 J

Answer

Insufficient data

Answer

20 J

Answer

400 J

Question 4

A porter lifts a suitcase of

300 N

from the ground and puts it on his head

10

above the ground. If the kinetic energy is ignored, what is the work done by the porter on the suitcase? (Take

g = 9.8 m/s^2

)

Accepted Answer

225 J

Answer

22.5 J

Answer

2250 J

Answer

150 J

Question 5

If the force applied to an object is

300 N

and the displacement of the object is

10

in the direction opposite to the force, what is the nature of the work done?

Accepted Answer

Negative

Answer

Infinite

Answer

Positive

Answer

Zero

Question 6

An engine does

300 N

of work in

10

seconds. What is the power developed by the engine?

Accepted Answer

500 W

Answer

50,000 W

Answer

5000 W

Answer

50 W

Question 7

An object of mass

300 N

is moved vertically upwards through a height of

10

. If the acceleration due to gravity is

g = 9.8 m/s^2

, what is the work done against gravity?

Accepted Answer

490 Joules

Answer

50 Joules

Answer

49 Joules

Answer

98 Joules

Question 8

An engine does

300 N

of work in

10

. What is the power of the engine in Watts?

Accepted Answer

300 W

Answer

18,000 W

Answer

900 W

Answer

30 W

Question 9

A girl of mass

300 N

climbs a staircase of

10

in

g = 9.8 m/s^2

. If each step is

20 cm

high, what is the power expended by her? (Take

g = 10 m/s^2

)

Accepted Answer

120 Watts

Answer

60 Watts

Answer

1200 Watts

Answer

240 Watts

Question 10

Which of the following occurs regarding work when a satellite orients itself in a circular orbit around the Earth?

Accepted Answer

The work done by gravity is zero because the force is perpendicular to the displacement.

Answer

The work done by gravity is negative as the satellite moves against vacuum resistance.

Answer

The work done by gravity is positive as it keeps the satellite in orbit.

Answer

The work done depends on the mass of the satellite and the radius of the orbit.

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