Physics Past Questions

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256

A machine whose efficiency is 60% has a velocity ratio of 5. If a force of 500N is applied to lift a load P, what is the magnitude of P?

A. 1500N
B. 500N
C. 4166N
D. 750N

View Answer & Discuss (4) JAMB 2004

257

I. Jet propelled aircraft
II. Rocket propulsion
III. The recoil of a gun
IV. A person walking
Which of the above is based on Newton's third law of motion

A. I and II only
B. I, II, III, and IV only
C. I and III only
D. I, II and III only

View Answer & Discuss (14) JAMB 2004

258

In a hydraulic press , a force of 40N is applied on the effort piston of area 0.4m². If the force exerted on the load piston is 400N, the area of the large piston is

A. 4m²
B. 8m²
C. 2m²
D. 1m²

View Answer & Discuss (8) JAMB 2004

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259

A 100kg box is pushed along a road with force of 500N. If the box moves with a uniform velocity, the coefficient of friction between the box and the road is