Physics Past Questions

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1326

A body is projected from the earth's surface with the intention of letting it escape from the earth's gravitational field. What is the minimum escape velocity of the body? [Earth's radius = 6.4 x 10³km, g = 10ms^-2]

A. 14 kms^-1
B. 13 kms^-1
C. 12 kms^-1
D. 11 kms^-1

View Answer & Discuss (5) JAMB 1995

1327

A uniform rod PQ of length 1m and mass 2kg is pivoted at the end p. If load of 14N is placed at the center of the rod, find the force that should be applied vertically upwards at Q to maintain the rod at equilibrium horizontally [g = 10ms^-2]

A. 68N
B. 28N
C. 17N
D. 7N

View Answer & Discuss (11) JAMB 1995

1328

A vehicle of mass m is driven by an engine of power P from rest. Find the minimum time it will take to acquire a speed

A. \(\frac{mv^2}{2p}\)
B. \(\frac{mv^2}{p}\)
C. \(\frac{mv}{p}\)
D. \(\frac{mv}{2p}\)

View Answer & Discuss (18) JAMB 1995

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1329

Which of the following statements are TRUE about frictional force? i. it is always a disadvantage ii. it is sometimes a disadvantage iii. it always exist where there is a relative motion of two bodies that are in contact iv. it is sometimes very useful