Question Library

The diagram above illustrates an object moving in a circular path at a constant speed. Which of the arrows indicates the direction of linear velocity?

You are provided with a stopwatch, a meter rule, a split cork, retort stand and clamp, a pendulum bob, a piece of thread, and other necessary apparatus. i. Place the retort stand on a laboratory stool. Clamp the split cork. ii. Suspend the pendulum bob from the split cork such that the point of support P of the bob is at height H = 100cm above the floor Q. The bob should not touch the floor and H should be kept constant throughout the experiment. iii. Adjust the length of the thread such that the center A of the bob is at a height y= AQ= 20cm from the floor. iv. Displace the bob such that it oscillates in a horizontal plane. v. Take the time t for 20 complete oscillations. vi. Determine the period T of oscillation and evaluate T vii. Repeat the procedure for four other values of y = 30cm, 40cm, 50cm, and 60cm. In each case, determine T and T. viii. Tabulate the results. ix. Plot a graph of T on the vertical axis and y on the horizontal axis, starting both axes from the origin (0,0). x. Determine the slope, s, of the graph and the intercept c on the vertical axis. xi. If in this experiment SR= c, calculate R. x. State two precautions taken to ensure accurate results. (b) i. The bob of a simple pendulum is displaced a small distance from the equilibrium position and then released to perform simple harmonic motion Identify where its: (\(\propto\)) kinetic energy is maximum (\(\beta\)) acceleration is maximum ii. An object of weight 120N vibrates with a period of 4.0s when hung from a spring. Calculate the force per unit length of the spring. [g= 10ms\(^{-2}\), \(\pi\)=3.142]

The density of 400cm\(^3\) of palm oil was 0.9gcm-3 before frying. If the density of the oil was 0.6gcm-3 after frying, assuming no loss of oil due to spilling, its new volume was?

What type of reaction is represented by the following scheme? \(_{1} ^{2} X\) + \(_{1} ^{2} Y\) -----> \(_{2} ^{3} Z\) + \(_{0} ^{1} n\) + energy

A lead bullet of mass 0.05 kg is fired with a velocity of 200 m/s into a lead block of mass 0.95 kg. Given that the lead block can move freely, the final kinetic energy after impact is

In the diagram given if the atmospheric pressure is 760mm, the pressure in the chamber G Is

A ball of mass 800g moving horizontally with a speed of 5m/s hits a vertical wall and rebounds with the same speed. The impulse experienced by the ball is?

The force between the molecules of a liquid in contact with that of a solid is?

A body of mass 100g moving with a velocity of 10ms-1 collides with a wall. If after collision it moves with a velocity of 2.0ms−1 in the opposite direction, calculate the change in momentum.

A 20kg mass is to be pulled up a slope inclined at 30^\circ to the horizontal. If efficiency of the plane is 75%. The force required to pull the load up the plane is J [g=10ms\(^{− 2}\)]

The tendency of a body to remain at rest when a force is applied to it is called.

The energy needed to move a unit positive charge around a complete electric circuit is called the

An object moves in a circular path of radius 0.5m with a speed of 1ms\(^{-1}\). What is its angular velocity?

What effort will a machine of efficiency 90% apply to a load of 180N if its efforts arm is twice as long as its load arm?

Temperature is the property of a body which is proportional to the ____.