A mirror is part of sphere of diameter 9.3cm. A boy stands 0.5m away from the mirror and is amused to see his image. Determine the height of the boys image if he is 1.3m tall. Where does the boy find his image? Why do you think the boy so amused at seeing his image ( a ray diagram is required).

The period of a pendulum varies directly as the square root of the length of the pendulum and inversely as the square root of the acceleration due to gravity. find the period when the length is 144 cm and the acceleration due to gravity is 980 cm per second squared, if the period is 7pi seconds when the length is 289 cm and the acceleration due to gravity is 980 cm per second squared.