Explain, why is it difficult for a fireman to hold a hose, which ejects large amounts of water at a high velocity.
Water is ejected with a large forward force (action) and due to reaction, the fireman experiences a large backward thrust. Therefore, the force experienced by him makes it difficult in holding the hose.
An object experiences a net zero external unbalanced force. Is it possible for the object to be travelling with a non-zero velocity? If yes, state the conditions that must be placed on the magnitude and direction of the velocity. If no, provide a reason.
Why it is advised to tie any luggage kept on the roof of a bus with a rope?
A batsman pushes a cricket ball which then roll on a level ground. After covering a short distance, the ball comes to rest. The ball slows to a stop because
(a) the batsman did not hit the ball enough.
(b) velocity is proportional to the force exerted on the ball.
(c) there is a force on the ball opposing the motion.
(d) there is no unbalanced force on the ball, so the ball would want to come to rest.
When a carpet is beaten with a stick, dust comes out. Explain why?
