Mechanics questions | form five Physics

1. The period of a particle executing simple harmonic motion (S.H.M.) is 3 seconds. If its amplitude is 25 cm, calculate the time taken by the particle to move a distance of 12.5cm on either side from the mean position.
2. A person weighing 50 kg stands on a platform which oscillates with a frequency of 2Hz and of amplitude 0.05m. Find his/her minimum weight as recorded by a machine of the platform.

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UNSOLVED

1. In which aspect does circular motion differ from linear motion?
2. Why there must be a force acting on a particle moving with uniform speed in a circular path?

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UNSOLVED

1. Figure 1 shows a particle moving in a semi-circular path AB of radius 6m with constant speed of 12ms^-1​ . Calculate its average velocity.

2. A stone tied to the end of string 80cm long, is whirled in a horizontal circle with a constant speed making 25 revolutions in 14 seconds. Determine the magnitude of its acceleration.

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UNSOLVED

1. Why the weight of a body becomes zero at the centre of the earth?
2. How far above the earth surface does the value of acceleration due to gravity becomes 36% of its value on the surface?

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UNSOLVED

1. Compute the period of revolution of a satellite revolving in a circular orbit at a height of 3400 km above the earth’s surface.
2. Prove that the angular momentum for a satellite of mass ​ M_s revolving  round the earth of mass ​ M_e ​ in an orbit of radius ​ r ​ is equal to

Answer / Solution

UNSOLVED