The diagram shown in the Figure 4 below shows a system in equilibrium with the rule horizontal. AB is a uniform rule of length 1.0m and weight 1.8N. Calculate the weight of the block X.    (3 mks)

How long will it take 240V, 3000W electric immersion heater to raise the temperature of 150 litres     of water in a well-lagged calorimeter made of copper of mass 20kg from 15⁰ to 70⁰C?  (3 mks)

A motor uses an electrical energy at a rate of 200W and raises a mass of 25kg through a vertical distance of 20m in 0.5 minutes. Determine the efficiency of the motor.                              (3 mks)

The diagram in the figure below shows water with negligible viscosity flowing steadily in a tube of different cross-section area. If at a point A, the cross section area is 120cm² and the velocity of water is 0.40ms^-1, calculate the velocity at B where cross section area is 4.0cm²?               (3 mks)

State two facts which show that heat from the sun does not reach the earth surface by convection.         (2 marks)

State how temperature affects the speed of sound in air.                          (1 mk)

The diagram shown in the figure below is an arrangement of three pulley wheels used to help in lifting loads. Use it to answer questions below.

(a) Complete the diagram to show how the rope goes round the wheels, position of the load and the effort.            (2 marks)

(b) Write down the velocity ratio (VR) of the system.                       (1 mark)

Explain briefly how the temperature in a green house is kept higher than outside.         (2 mks)

A man of mass 72kg jumps from a small boat on to the lake shore with a forward velocity of 9.0ms^-1. If the mass of the boat is 216kg, calculate the initial backward velocity of the boat.         (3 marks)

The below shows a micrometer screw gauge being used to measure the diameter of a metal rod. The thimble scale has 50 divisions.

Find the diameter of the metal rod.                    (1 mk)