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Problem Solving Questions
6.1 A man has pulled a cart through 35 m applying a force of 300 N. Find the work done by the man.
6.2 A block weighing 20 N is lifted 6 m vertically upward. Calculate the potential energy stored in it.
6.3 A car weighing 12 kN has speed of 20 m/s. Find its kinetic energy stored in it.
6.4 A 500 g stone is thrown up with a velocity of 15 m/s. Find its
i) P.E. at its maximum height
ii) K.E. when it hits the ground
6.5 On reaching the top of a slope 6 m high from its bottom, a cyclist has a speed of 1.5 m/s. Find the kinetic energy and the potential energy of the cyclist. The mass of the cyclist and his bicycle is 40 kg.
6.6 A motor boat moves at a steady speed of 4 m/s. Water resistance acting on it is 4000 N. Calculate the power of its engine.
6.7 A man pulls a block with a force of 300 N through 50 m in 60 s. Find the power used by him to pull the block.
6.8 A 50 kg man moved 25 steps up in 20 seconds. Find his power, if each step is 16 cm high.
6.9 Calculate the power of a pump which can lift 200 kg of water through a height of 6 m in 10 seconds.
6.10 A power of 2.5 kW is used to drive a lift. If the lift carries 500 kg of weight, find the height to which the lift can lift the weight in 30 seconds.