2000 - JAMB Physics Past Questions and Answers - page 1

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

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?

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?

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

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

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

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.

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]

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?

Total internal reflection occurs when light moves from