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Avinash & 1 other asked a question
Subject: Science, asked on on 18/11/13
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Subject: Science, asked on on 19/11/19
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Subject: Science, asked on on 21/6/10
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Subject: Science, asked on on 17/3/13
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Subject: Science, asked on on 13/7/14
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Subject: Science, asked on on 14/2/14
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Subject: Science, asked on on 26/1/11
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Subject: Science, asked on on 5/5/14
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Subject: Science, asked on on 6/3/15
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Subject: Science, asked on on 4/2/14
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Subject: Science, asked on on 20/10/12
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Subject: Science, asked on on 18/11/11

1. when is work done by a force zero?.

2.Moon is experiencing a gravitational force due to earth and it is revolving around the earth by an circular orbit. How much work is done by the moon ?

3. What is the work done against gravity when a body is moving horizondally along a frictionless surface. What is the work done against gravity ?

4. A ball is thrown vertically up what happens its potential energy when becomes zero?

5. If the speed of the body is half what is the change in the kinetic energy?

6. A 2m height person holding 25 kg trunk on his head is standing at road ways bus stop. How much  work is done by him?

7. If hard works 60J in 1m . What is its power ?

8. Calculate the work done when a force of 15N moves a body by 5m in its direction .

9. what will be the kinetic energy of a body when its mass is made 4 times and velocity is doubled.?

10. IN an office a tube light of 40W, a fan of 75W and a cooler of 150W, all applicance are used 8hrs a day. Calculate the energy consumed per day in commercial unit of energy.

11. 4 persons jointly lift 350kg box to a height of 1m and holding it

(a) calculate the work done in lifting the box.

( b) how much work they do in holding it .

(c) why do they get tired while holding it. 

12. The potential enrgy of a freely falling object decreasing gradually.

(a) Does it voilate law of conservation of energy.

(b) An object is dropped from a height (h)

  a. When is it potential energy maximum?

  b. When is it kinetic energy maximum?

13. A boy of mass 45kg climbs up 20 steps in 20sec. If each step is 25cm height calculate the power of the boy used in climbing (G=10)

14. State the law of conservation of energy.

 Explain with the help of a simple pentulum. Illustrate if nessesary .

15. A mass of 10kg is droped from a height 50cm. Find its :

(a) potential energy just before dropping

(b) kinetic energy just on touching the ground

(c) velocity with which it hits the ground.

16. Can any object have momentum evenif its machanical energy is zero.

(a) a ball is droped from a height 10m

(b) if energy of the ball is reduced by 40% after stricking the ground. 

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Subject: Science, asked on on 17/4/14
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Subject: Science, asked on on 14/3/14
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Subject: Science, asked on on 13/1/11
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