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49 questions

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Question 21

jamb 2000

I. The frictional force is independent of the area of the surfaces in conduct
II. The frictional force depends on the nature of the surfaces in contact
III. The frictional force depends on the speed of sliding
IV. The frictional force is directly proportional to the normal reaction.

Which combination of the above is true of sliding friction?

AI, III and IV

BI, II and IV

CI, II and III

DII, III and IV

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Question 22

jamb 2000

A rope is being used to pull a mass of 10kg vertically upward. Determine the tension in the rope if, starting from rest, the mass acquires a velocity of 4ms\(^{-1}\) in 8s [g = 10ms\(^{-2}\)]

A5N

B50N

C95N

D105N

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Question 23

jamb 2000

A stream is flowing at 0.75ms\(^{-1}\) and a boat heading perpendicular for the stream landed at the opposite bank at an angle of 30°. Calculate the velocity of the boat.

A1.50ms^-1

B1.00ms^-1

C0.86ms^-1

D0.65ms^-1

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Question 24

jamb 2000

A catapult used to hold a stone of mass 500g is extended by 20cm with an applied force F. If the stone leaves with a velocity of 40m/s, the value of F is

A4.0 x 10²N

B2.0 x 10³N

C4.0 x 10³N

D4.0 x 10⁴N

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Question 25

jamb 2000

If the force and the velocity on a system are each reduced simultaneously by half, the power of the system is

Adoubled

Breduced to a quarter

Creduced by half

Dconstant

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Question 26

jamb 2000

At a fixed point below a liquid surface, the pressure downwards is P1 and pressure upwards is P2. It can be deduced that?

AP₁ > P₂

BP₁ ≥ P₂

CP₁ < P₂

DP₁ = P₂

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Question 27

jamb 2000

The velocity ratio of a machine is 5 and its efficiency is 75%. What effort would be needed to lift a load of 150N with the machine?

A20N

B30N

C40N

D50N

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Question 28

jamb 2000

I. Its velocity is constant
II. No work is done on the body
III. It has constant acceleration directed away from the centre
IV. The centripetal force is directed towards the centre

Which combination of the above is true of a body moving with constant speed in a circular track?

AII and IV

BI and IV

CII and III

DI and III

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Question 29

jamb 2000

When a ship sails from salt water into fresh water, the fraction of its volume above the water surface will

Aincrease

Bdecrease

Cremain the same

Dincrease then decrease

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