Physics Past Questions and Answers

A catapult used to hold a stone of mass 500g is extended by 20cm with an applied force F. If the stone leaves with a velocity of 40m/s, the value of F is

A stream is flowing at 0.75ms\(^{-1}\) and a boat heading perpendicular for the stream landed at the opposite bank at an angle of 30°. Calculate the velocity of the boat.

A rope is being used to pull a mass of 10kg vertically upward. Determine the tension in the rope if, starting from rest, the mass acquires a velocity of 4ms\(^{-1}\) in 8s [g = 10ms\(^{-2}\)]

I. The frictional force is independent of the area of the surfaces in conduct<br/>II. The frictional force depends on the nature of the surfaces in contact<br/>III. The frictional force depends on the speed of sliding<br/>IV. The frictional force is directly proportional to the normal reaction.<br/>Which combination of the above is true of sliding friction?

Total internal reflection occurs when light moves from