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A car of mass 900 kg is travelling at a steady speed of 30 m/s against a resistive force of 2000 N, as illustrated in figure
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1
|
50181
|
February 29, 2024
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Figure shows a conveyor belt transporting a package to a raised platform. The belt is driven by a motor
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0
|
15123
|
March 21, 2018
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|
Four men lift a 250 kg box to a height of 1 m and hold it without raising or lowering it
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0
|
3798
|
March 21, 2018
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|
A light and a heavy object have the same momentum, find out the ratio of their kinetic energies. Which one has a larger kinetic energy
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0
|
2029
|
March 21, 2018
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|
Show that when a body is dropped from a certain height, the sum of its kinetic energy at any instant during its fall is constant
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0
|
11099
|
March 21, 2018
|
|
Briefly describing the gravitational potential energy
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0
|
3725
|
March 21, 2018
|
|
A body thrown at a certain angle to the ground moves in a curved path and falls back to the ground
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0
|
1649
|
March 21, 2018
|
|
Two workmen are employed on a building project, as shown in figure
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0
|
13826
|
March 21, 2018
|
|
Figure shows, in order, five stages of an athlete successfully performing a pole-vault
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0
|
6336
|
March 21, 2018
|
|
Give one example of each of the following: Small mass but high kinetic energy
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0
|
5183
|
March 21, 2018
|
|
The velocity of a body moving in a straight line is increased by applying a constant force
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0
|
5288
|
March 21, 2018
|
|
Avinash can run at a speed of 8 ms-1 against the frictional force of 10 N, and Kapil can move at a speed of 3 ms-1 against the frictional force of 25 N. Who is more powerful and why?
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0
|
1910
|
March 21, 2018
|
|
A rocket is moving up with a velocity v. If the velocity of this rocket is suddenly tripled, what will be the ratio of two kinetic energies?
|
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0
|
3877
|
March 21, 2018
|
|
Derive an expression for kinetic energy of an object
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0
|
47178
|
March 21, 2018
|
|
What types of energy transformation takes place in the following:
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0
|
8378
|
March 21, 2018
|
|
Give three examples when the object is not displaced in spite of a force acting on it
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0
|
4197
|
March 21, 2018
|
|
Observe the diagrams I and II carefully
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0
|
13209
|
March 21, 2018
|
|
What is power? How do you differentiate kilowatt from kilowatt hour?
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0
|
1813
|
March 21, 2018
|
|
Calculate the work done against the gravity
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0
|
890
|
March 21, 2018
|
|
What is the relationship between the commercial unit and SI unit of energy?
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0
|
3136
|
March 21, 2018
|
|
What is the commercial unit of energy?
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0
|
697
|
March 21, 2018
|
|
What kind of energy transformation takes place when a body is dropped from a certain height?
|
|
0
|
3288
|
March 21, 2018
|
|
Give one example each of potential energy (i) due to position (ii) due to shape
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0
|
6016
|
March 21, 2018
|
|
Give any two uses of kinetic energy
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0
|
3891
|
March 21, 2018
|
|
What is energy? What is unit of energy?
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|
0
|
715
|
March 21, 2018
|
|
On what factors the work done on a body depends?
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|
0
|
13829
|
March 21, 2018
|
|
Give two examples from everyday life where work is done
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0
|
2844
|
March 21, 2018
|