Mechanics questions | form five Physics

Find the gravitational potential at a point on the earth’s surface if the values of universe
gravitational constant, mass and radius of the earth are 6.7×10​^-11​ Nm​²​ kg​^-2​, 6.0×10^-24​kg and 6.4×10​⁶​ m respectively.

Answer / Solution

UNSOLVED

A communication satellite occupies an orbit such that its period of revolution about the earth is 24 hours.

1. What is the physical significance of this period?
2. Establish an expression for the radius, R​_o of the orbit stating clearly the meaning of all symbols used.

Answer / Solution

UNSOLVED

An object falling freely from a given height, H hits an inclined plane at a height, h from the ground. If the direction of velocity of the object as a results of the impact becomes horizontal, what would be the value of , at the time it reaches the ground?

Answer / Solution

UNSOLVED

A ball is kicked with an initial velocity of 8.0 m/s such that, it just passes over the barrier which is 2.2 m high. Neglecting air resistance, calculate:
(i) the horizontal velocity of the ball.
(ii) the total time of flight.

Answer / Solution

UNSOLVED

A rocket of mass 20kg has 180kg of fuel. If the exhaust velocity of the fuel is 1.6 km/sec, calculate:

1. The minimum rate of fuel consumption that enable the rocket to rise from the ground.
2. The ultimate vertical speed gained by the rocket when the rate of fuel consumption is 2kg/sec.

Answer / Solution

UNSOLVED