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48 questions

Question 1 of 8 48 total questions

Question 21

jamb 1987

If a beaker is filled with water it is observed that the surface of the water is not horizontal at the glass-water interface. This behavior is due to

Afriction

Bviscosity

Csurface tension

Devaporation

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Question 22

jamb 1987

The coefficient of static friction between a 40kg crate and concrete surface is 0.25. Find the magnitude of the minimum force needed to keep the crate stationary on the concrete base inclined at 45o to the horizontal. [G = 10ms-1]

A400N

B300N

C283N

D212N

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Question 23

jamb 1987

A body rolls down a slope from a height of 100m. its velocity at the foot of the slope is 20ms^-1. What percentage of its initial potential energy is converted into kinetic energy? [g = 10ms^-1]

A40%

B35%

C20%

D15%

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Question 24

jamb 1987

A constant force of 40N acting on a body initially at rest gives an acceleration of 0.1ms^-2 for 4s. Calculate the work done by the force

A8J

B10J

C32J

D160J

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Question 25

jamb 1987

An elevator of mass 4800kg is supported by a cable which can safely withstand a maximum tension of 60 000N. The maximum upward acceleration the elevator can have is

A2.5ms^-2

B5.0ms^-2

C7.5ms^-2

D10.0ms^-2

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Question 26

jamb 1987

A man walks 8km north and then 5km in a direction 60^o east of north. Find the distance from his starting point

A11.36km

B12.36km

C13.00km

D14.36km

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Question 27

jamb 1987

A jet engine develops a thrust of 270Ns when the velocity of the exhaust gases relative to the engine is 300ms^-1. What is the mass of the material ejected per second?

A81.00kg

B9.00kg

C0.90kg

D0.09kg

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Question 28

jamb 1987

Which of the following units is equivalent to kgms^-1?

ANs^-1

BNms^-1

CNs

DJs^-1

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