Mechanics questions | form five Physics

In the first second of its flight a rocket ejects 1/60 of its mass with a relative velocity of
2400m/s.

1. Find its acceleration.
2. What is the final velocity if the ratio of initial to final mass of the rocket is 4 at a time of 60 seconds?

Answer / Solution

UNSOLVED

A ball is thrown upwards with an initial velocity of 33m/s from a point 65° on the side of a hill which slopes upward uniformly at an angle of 28°.

1. At what distance up the slope does the ball strike?
2. Calculate the time of flight of the ball.

Answer / Solution

UNSOLVED

1. State the principle of conservation of linear momentum.
2. Give two examples of the principle stated in (i).

Answer / Solution

UNSOLVED

A cannon of mass 1300kg fires a 72kg ball in a horizontal direction with a muzzle speed of 55m/s. If the cannon is mounted so that it can recoil freely calculate the:

1. recoil velocity of the cannon relative to the earth.
2. horizontal velocity of the ball relative to the earth.

Answer / Solution

UNSOLVED

1. Define the term ‘radial acceleration’.
2. An insect is released from rest at the top of the smooth bowling ball such that it slides over the ball. Prove that it will lose its footing with the ball at an angle of about 48° with the vertical.

Answer / Solution

UNSOLVED