JAMB Physics Past Questions & Answers - Page 342

1,706.

If a freely suspended object is pulled to one side and released, it oscillates about the point of suspension because the

A.

acceleration is directly proportional to the displacement

B.

motion is directed away from the equilibrium point

C.

acceleration is directly proportional to the square of the displacement

D.

velocity is minimum at the equilibrium ponit

Correct answer is A

No explanation has been provided for this answer.

1,707.

A rocket is fired from the earth's surface to a distant planet. By Newton's law of universal gravitation, the force F will

A.

increase as r reduces

B.

increase as G varies

C.

remains constant

D.

increases as r increases

Correct answer is A

No explanation has been provided for this answer.

1,708.

A car starts from rest and moves with a uniform acceleration of 30ms-2 for 20s. Calculate the distance covered at the end of the motion

A.

6km

B.

12km

C.

18km

D.

24km

Correct answer is A

S = \(ut + \frac{1}{2}at^2\)

S = \(0 \times 2 + \frac{1}{2} \times 30 \times 20^2\)

1,709.

Calculate the total distance covered by a train before coming to rest if its initial speed is 30ms-1 with a constant retardation of 0.1m-2

A.

5500m

B.

4500m

C.

4200m

D.

3000m

Correct answer is B

S = \(\frac{V^2 - U^2}{20}\)

S = \(\frac{0^2 - 30^2}{2 \times 0.1}\)