1.0 A girl stands inside a lift on the second floor of an 18 storey building. If the lift is
ascending upwards at an acceleration of 3ms-2
and she weighs 60kg, determine the reaction of
the lift at the girl's feet. (3mks)
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What pressure difference is required between the ends of a 2.0-m-long, 1.0-mm-diameter horizontal tube for 40 c water to flow through it at an average speed of 4.0 m/s?

Two cannon balls weighing 18 kg and 24 kg are chained together and fired horizontally with a velocity of 165 m/s from the top of a 21-m wall. the chain breaks during the flight of the cannonballs and the 18-kg cannonball strikes the ground at t = 1.5 s, at a distance of 240 m from the foot of the wall, and 7 m to the right of the line of fire. determine the position of the other cannonball at that instant. neglect the resistance of the air.

The strong nuclear force acts over a small distance than the electrostatic force. true or false