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Name the health problems subsequent to a disaster.
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How does the kinetic energy of a moving body depend on its (i) speed, and (ii) mass?
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A ball of mass 200 g falls from a height of 5 metres. What is its kinetic energy when it just reaches the ground? (g = 9.8 m/s2)
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Find the momentum of a body of mass 100 g having a kinetic energy of 20 J.
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Two objects having equal masses are moving with uniform velocities of 2 m/s and 6 m/s respectively. Calculate the ratio of their kinetic energies.
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A body of 2 kg falls from rest. What will be its kinetic energy during the fall at the end of 2 s? (Assume g = 10 m/s2)
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On a level road, a scooterist applies brakes to slow down from a speed of 10 m/s to 5 m/s. If the mass of the scooterist and the scooter be 150 kg, calculate the work done by the brakes. (Neglect air resistance and friction)
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A man drops a 10 kg rock from the top of a 5 m ladder. What is its speed just before it hits the ground? What is its kinetic energy when it reaches the ground? (g = 10 m/s2)
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Draw a well labelled diagram of typical prokaryotic cell?
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What do you understand by the kinetic energy of a body?
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A horse and a dog are running with the same speed. If the weight of the horse is ten times that of the dog, What is the ration of their kinetic energies?
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When a ball is thrown inside a moving bus, does its kinetic energy depend on the speed of the bus? Explain.
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A bullet of mass 15 g has a speed of 400 m/s. What is its kinetic energy? If the bullet strikes a thick target and is brought to rest in 2 cm, calculate the average net force acting on the bullet. What happens to the kinetic energy originally in the bullet?
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A car is accelerated on a levelled road and attains a speed of 4 times its initial speed. In this process, the kinetic energy of the car :
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Write main differences between plant and animal cells.
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The momentum of a bullet of mass 20 g fired from a gun is 10 kg.m/s. The kinetic energy of this bullet in kJ will be :
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Which of the following does not posses the ability to do work not because of motion?
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Name the positively charged particle present in the atoms of all the elements.
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What is the positive charge on the nucleus of an atom due to?
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Which subatomic particle was discovered by : Goldstein ?
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