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Carts with rubber tyres are easier to play than those with iron tyres. Why?
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0
|
3384
|
August 18, 2016
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Friction is independent of the area, but brakes of very small contact area are not used. Why?
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0
|
1924
|
August 18, 2016
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|
Mention a factor on which coefficient of friction depends
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0
|
1477
|
August 18, 2016
|
|
Why are the lubricants used in machines?
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0
|
1091
|
August 18, 2016
|
|
How can the friction be reduced?
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0
|
1074
|
August 18, 2016
|
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Is force of friction independent of path?
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0
|
1563
|
August 18, 2016
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|
What are concurrent forces
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0
|
2361
|
August 18, 2016
|
|
A stream of water flowing horizontally with a speed of 15 m rushes out of a tube of cross-sectional area
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1
|
1947
|
August 18, 2016
|
|
The given figure shows the position time graph of a particle of mass 4 kg
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1
|
697
|
August 18, 2016
|
|
A pebble of mass 0.05 kg is thrown vertically upwards. Give the direction and magnitude of the new force on the pebble
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1
|
1535
|
August 18, 2016
|
|
State and prove impulse-momentum theorem
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0
|
35385
|
August 18, 2016
|
|
In the case of rocket propulsion derive expression for
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1
|
25279
|
August 18, 2016
|
|
Figure below shows the position-time graph of a particle of mass 4 kg. What is the
|
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1
|
4664
|
August 18, 2016
|
|
Prove that Newtons second law is the real law of motion
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0
|
62567
|
August 18, 2016
|
|
The figure given below shows position-time graph of a particle of mass 0.04 kg. Suggest a suitable
|
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1
|
3661
|
August 18, 2016
|
|
If in Q. 9 the speed of the stone is increased beyond the maximum permissible value, and the string breaks suddenly, which of the fallowing correctly describes the trajectory of the stone after the string breaks?
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1
|
476
|
August 18, 2016
|
|
A batsman deflects a ball by an angle of 45° without changing its initial speed, which is equal to 54 km. What is the impulse imparted to the ball ? Mass of the ball is 0.15 kg
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0
|
18085
|
August 18, 2016
|
|
A shell of mass 0.02 kg is fired by a gun of mass 100 kg. If the muzzle speed of the shell is 80 ms-1, what is the recoil speedof the gun?
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0
|
8540
|
August 18, 2016
|
|
Two billiard balls each of mass 0.05 kg moving in opposite directions with speed 6 m collide and rebound with the same speed. What is the impulse imparted to each ball due to the other?
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0
|
12325
|
August 18, 2016
|
|
A nucleus is at rest in the laboratory frame of reference. Show that if it disintegrates into two smaller nuclei, the products must be emitted in opposite directions
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0
|
4891
|
August 18, 2016
|
|
A bob of mass 0.1 kg hung from the ceiling of a room by a string 2 m long is set into oscillation
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|
1
|
2689
|
August 18, 2016
|
|
A rocket with a lift-off mass 20,000 kg is blasted upwards with net initial acceleration of 5 m, calculate initial thrust of the blast
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0
|
4396
|
August 18, 2016
|
|
What is a non-inertial frame of reference?
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0
|
871
|
August 18, 2016
|
|
What is inertial frame of reference?
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0
|
751
|
August 18, 2016
|
|
The driver of a three wheeler moving with a speed of 36 km see a child standing in the middle of the road and brings his vehicle to rest in 4 s, just in time to save the child
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0
|
4961
|
August 18, 2016
|
|
A constant force acting on a body of mass 3 kg changes its speed from 2 m to 3.5 m in 24 s. The direction of motion of the body remains same. Find magnitude and direction of force
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0
|
4036
|
August 18, 2016
|
|
A learner shooter fired a shot from his rifle and his shoulder got injured in the process. What mistake did he commit?
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0
|
1616
|
August 18, 2016
|
|
A body is moving with uniform velocity. Can it be said to be in equilibrium ? Why?
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0
|
2400
|
August 18, 2016
|
|
Which law can be an example in physics where results of a law are truer than the parent law from which it is derived in the first pface. How?
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|
0
|
679
|
August 18, 2016
|
|
Two particles A and B collide to separate out Show that their total momentum conserves
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0
|
1632
|
August 18, 2016
|