Mechanics questions | form five Physics

A satellite of mass 600kg is in a circular orbit at a height 2×10​⁶ ​km above the earth’s surface.
Determine the:

1. Orbital speed.
2. Gravitational potential energy.

Answer / Solution

UNSOLVED

1. What would happen if gravity suddenly disappears?
2. Two base of a mountain are at sea level where the gravitational field strength is 9.81​ N / ​kg . ​If the value of gravitational field at the top of the mountain is 9.7​ N / ​ kg , ​ calculate the height of the mountain above the sea level.

Answer / Solution

UNSOLVED

1. Why is flywheel designed such that most of its mass is concentrated at the rim? Briefly explain.
2. Estimate the couple that will bring the wheel to rest in 10 seconds when a grinding wheel of radius 40 cm and mass 3 kg is rotating at 3600 revolutions per minute

Answer / Solution

UNSOLVED

1. Why an ice skater rotates at relatively low speed when stretches her arms and leg outward?
2. Calculate the moment of inertia of a sphere about an axis which is a tangent to its surface given that the mass and radius of the sphere are 10kg and 0.2m respectively.

Answer / Solution

UNSOLVED

1. Provide two typical examples of simple harmonic motion (S.H.M.).
2. Why the velocity and acceleration of a body executing simple harmonic motion are out of phase?

Answer / Solution

UNSOLVED