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46 questions

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Question 21

waec 1997

A missile weighing 400N on the earth surface is shot into the atmosphere to an altitude of 6.4 x \(10^{-6}\)m. Taking the earth as a sphere of radius 6.4 x \(10^{-6}\)m and assuming the inverse-square law of universal gravitation, what would be the weight of the missile at that altitude?

A100N

B200N

C400N

D800N

E1600N

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Question 22

waec 1997

Two forces 3N and 4N act on a body in directions due north and due east respectively. Calculate their equilibrant

A5N 53° east of North

B5N 53° west of the south

C5N 37° north of east

D7N 37° west of North

E7N 37° south of west

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Question 23

waec 1997

Two blocks of the same dimension, one steel and the other wooden are dropped simultaneously from the same height. If they fall freely neglecting air resistance the?

ATwo blocks hit the ground simultaneously because they have the same acceleration

BTwo blocks reach the ground at the same time because their dimensions are the same

CWooden block being lighter than the steel block reaches the ground first

DSteel block reaches the ground first because it is denser than the wooden block

ESteel block takes half as much time as the wooden block to reach the ground because it is more massive than the wooden block

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Question 24

waec 1997

A ball of mass 0.1kg approaching a tennis player with a velocity of 10ms\(^{-1}\),is hit back in the opposite direction with a velocity of 15ms\(^{-1}\). If the time of impact between the racket and the ball is 0.01s, calculate the magnitude of the force with which the ball is hit

A5000N

B500N

C250N

D50N

E25N

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Question 25

waec 1997

An object falls freely from a height of 25m onto the roof a building 5m high. Calculate the velocity with which the object strikes the roof (g=10\(ms^{-2}\)

A17.3\(ms^{-2}\)

B20\(ms^{-2}\)

C24.5\(ms^{-2}\)

D125\(ms^{-2}\)

E200\(ms^{-2}\)

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Question 26

waec 1997

An object of mass 0.40 kg attached to the end of a string is whirled around in a horizontal circle of radius 2.0m with a constant speed of 8\(ms^{-1}\). Calculate the angular velocity of the object

A0.8rad\(s^{-1}\)

B2 rad\(s^{-1}\)

C4 rad\(s^{-1}\)

D8 rad\(s^{-1}\)

E16 rad\(s^{-1}\)

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