K.C.S.E Physics Q & A - MODEL 2011PP1QN16
​Figure 11 shows a stone attached to the end of a string moving in a horizontal circle with a uniform speed of 2m/s. When the stone reaches point X on the circle, the string breaks.
​(i) indicate on the diagram with an arrow, the direction of the motion of the stone when the string breaks.
(ii) State the magnitude of the velocity after the string breaks. (iii) Give a reason for your answers in (i) and (ii). (b) Figure 12 shows a lorry towing a trailer using a rope.
​The lorry exerts a force N on the trailer and the trailer exerts an equal but opposite force M on the lorry. The frictional force between the trailer and the road is F.
Explain how the forces N, M and F enable the trailer to move. (c) Figure 13 shows a frictionless trolley of mass 2kg moving with uniform velocity towards a wall. At the front of the trolley is a spring whose spring constant is 25N/m. The trolley comes to rest momentarily after compressing the spring by 3cm and then rebounds from the wall.
​(I) Determine
(I) the force exerted on the wall by the spring. (II) the maximum acceleration of the trolley as it rebounds from the wall. (ii) State the reason why the trolley acquires a constant velocity after it rebounds.
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K.C.S.E Physics Q & A - MODEL 2011PP1QN15
​Figure 10 shows a simple pendulum of length 80cm. The pendulum bob whose mass is 50g oscillates between points A and B, through its rest position C. A and B are both 10cm higher than C
(a) (i) Indicate with an arrow, on the path ACB, the direction of the greatest velocity of the bob as it moves from A to B.
(ii) State the form of energy possessed by the pendulum bob at point A. (b) Determine: (i) the velocity of the bob at point C, (ii) the tension in the string as the bob passes point C.(take acceleration due to gravity g = 10 m/s2) (c) After some time, the pendulum comes to rest at point C. State what happens to the energy it initially possessed. K.C.S.E Physics Q & A - MODEL 2011PP1QN13
​A particle starts from rest and accelerates uniformly in a straight line. After 3 seconds it is 9m from the starting point. Determine the acceleration of the particle.
K.C.S.E Physics Q & A - MODEL 2011PP1QN08
When the temperature of a gas in a closed container is raised, the pressure of the gas increases. Explain how the molecules of the gas cause the increase in pressure.
ANSWER
K.C.S.E Physics Q & A - MODEL 2011PP1QN06
​Figure 5 is a graph of net force on a body against it’s velocity as it falls through a liquid.
​Determine the terminal velocity of the body.
ANSWER
K.C.S.E Physics Q & A - MODEL 2010PP2QN19
​(a) State the property of radiation that determines the number of electrons emitted when a radiation falls on a metal surface.
(b) Figure 15 is a graph of the stopping potential Vs against frequency in an experiment on photoelectric effect.
​(i) What is meant by stopping potential?
(ii) Given that the stopping potential Vs is related to the frequency by the equation K.C.S.E Physics Q & A - MODEL 2010PP2QN17
​(a) Figure 12, shows an electrical circuit including three switches, S1, S2, S3, and three identical lamps L1, L2, L3. A constant potential difference is applied across X and Y.
​(î) Other than L1, state the lamp that will light when S1 and S2 are closed.
(ii) How does the brightness of L1 in (i) above compare with its brightness when all the switches are closed? (iii) Explain the observation in part (ii) above. (b) Figure 13, shows a cell in series with a 3ohms resistor and a switch. A high resistance voltmeter is connected across the cell.
The voltmeter reads 1.5V with the switch open and 1.2V with the switch closed.
(i) State the electromotive force of the cell. (ii) Determine the current through the 3ohms resistor when the switch is closed. (iii) Determine the internal resistance of the cell. (c) (î) Another resistor R is connected in series with the 3ohms resistor so that a current of 0.15A flows when the switch is closed. Determine the resistance of R. K.C.S.E Physics Q & A - MODEL 2010PP2QN15
​(a) Figure 8, shows a circuit that may be used to charge a capacitor.
​(i) state the observation on the milliameter when the circuit is switched on:
(ii) explain the observation in (î) above. (b) The circuit in figure 8 is left on for some time. State the value of p.d. across: (j) the resistor R; (ii) the capacitor C; (c) sketch the graph of potential difference (V) across R against time. (d) Figure 9 shows three capacitors connected to a 10V battery.
Calculate:
(î) the combined capacitance of the three capacitors; (ii) the charge on the 5.0 uF capacitor. K.C.S.E Physics Q & A - MODEL 2010PP2QN13The wavelength of a radio wave is 1km. Determine its frequency.
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