UNIT 6:

Work and Energy...
Numerical Problems...

Numerical No: 6.1,6.2,6.3,6.4,6.5,6.6,6.7,6.8,6.9,6.10

NUMERICAL NO: 6.1

• A man has pulled a cart through 35 m applying a force of 300 N. Find the work done by the man.


SOLUTION...
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NUMERICAL NO: 6.2

• A block weighting 20 N is lifted 6 m vertically upward. Calculate the potential energy stored in it.


SOLUTION...
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NUMERICAL NO: 6.3

• A car weighting 12 kN has speed of 20 ms^-1. Find its kinetic energy.


SOLUTION...
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NUMERICAL NO: 6.4

• A 500 g stone is through up with a velocity of 15 ms^-1. Find its;

  • P.E at its maximum height
  • K.E when it hits the ground


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NUMERICAL NO: 6.5

• On reaching the top of a slop 6 m high from its bottom, a cyclist has a speed of 1.5 ms^-1. Find the kinetic energy and the potential energy of the cyclist. The mass of the cyclist and his bicycle is 40 kg.


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NUMERICAL NO: 6.6

• A motor boat moves at a steady speed of 4 ms^-1. Water resistance acting on it is 4000 N. Calculate the power of its energy.


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NUMERICAL NO: 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.


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NUMERICAL NO: 6.8

• A 50 kg man moved 25 steps up in 20 seconds. Find the power, if each step is 16 cm high.


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NUMERICAL NO: 6.9

• Calculate the power of a pump which can lift 200 kg of water through a height of 6 m in 10 seconds.
  


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NUMERICAL NO: 6.10

• An electric motor of one hp is used to run water pump. The water pump takes 10 minutes to fill an overhead tank. The tank has the capacity of 800 liters and height of 15 m. Find the actual work done by the electric motor to fill the tank. Also find the efficiency of the system.
  


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