Kinetics of a Particle: Power & Efficiency

Select the answer for each of the following questions, then press "Mark" at the bottom of the page to receive feedback.
A pen and paper may be required to assist in the answering of some questions.
Questions beginning with "cont...." follow on from the previous question.

1) Calculate the power developed by the 100 N force which acts on the 10 Kg block. The block has a speed of 2 m/s.

P = ?

One answer only.

0 W
50 W
100 W
200 W
None of the above

2) Calculate the power developed by the 100 N force which acts on the 10 Kg block. The block has a speed of 2 m/s.

P = ?

One answer only.

50 W
100 W
200 W
250 W
None of the above

3) Calculate the power developed by the 100 N force after the 10 Kg block has been displaced a distance s as indicated. The block is originally at rest on a smooth surface.

P = ?

One answer only.

100 W
500 W
1000 W
1200 W
None of the above

4) Calculate the power developed by the 100 N force after the 10 Kg block has been displaced a distance s as indicated. The block is originally at rest on a smooth surface.

P = ?

One answer only.

20 W
50 W
150 W
None of the above

5) Calculate the power developed by the 100 N force after the 10 Kg block has been displaced a distance s as indicated. The block is originally at rest on a smooth surface. When s = 0 the spring is unstretched.

P = ?

One answer only.

160 W
240 W
400 W
500 W
None of the above

6) A motor pulls the 10 Kg block forward with a constant velocity of v = 9 m/s. If the coefficient of kinetic friction between the block and the surface is m_k = 0.1, and the motor has an efficiency of e = 0.9, determine the required power which must be supplied by the motor.

P = ?

One answer only.

79.5 W
88.3 W
98.1 W
100 W
None of the above

7) cont....Solve the problem if at the instant considered the block has a velocity of 9 m/s and an acceleration of 1 m/s²

P = ?

One answer only.

98.1 W
178.3 W
198.1 W
220.1 W
None of the above

This test has been created using the CASTLE Toolkit