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A block of mass 25 kg is raised by a 50 kg man in two different ways as shown in figure
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1
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3400
|
December 22, 2016
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A block of mass 15 kg is placed on a long trolley
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1
|
3159
|
December 22, 2016
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If the speed of stone is increased beyond the maximum permissible value
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1
|
1032
|
December 22, 2016
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A block of mass M is held against a rough vertical wall by pressing it with a finger
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1
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5053
|
December 22, 2016
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A body placed on a rough inclined plane just begins to slide
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1
|
7505
|
December 22, 2016
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Explain why a horse cannot pull a cart and run in empty space?
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1
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10776
|
December 22, 2016
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Figure below shows the position-time graph of a particle of mass 4 kg
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1
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3528
|
December 22, 2016
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Give the magnitude and direction of the net force acting on a stone of mass 0.1 kg
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1
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2925
|
December 22, 2016
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Give the magnitude and direction of the net force acting on
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1
|
2132
|
December 22, 2016
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A pebble of mass 0.05 kg is thrown vertically upwards
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1
|
7528
|
December 22, 2016
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|
Ten one-rupee coins are put on top of each other on a table
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1
|
2841
|
December 22, 2016
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A person of mass 50 kg
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1
|
6544
|
December 22, 2016
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A passenger of mass 72.2 kg
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1
|
3897
|
December 22, 2016
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A woman throws an object of mass 500 g with a speed of 25 m/s
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1
|
8517
|
December 22, 2016
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|
Why does a child feel more pain when she falls down on a hard cement floor, than when she falls on the soft muddy ground in the garden?
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0
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5567
|
December 22, 2016
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Why are porcelain objects wrapped in paper or straw before packing for transportation?
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0
|
2652
|
December 22, 2016
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|
A person driving a car suddenly applies the brakes on seeing a child on the road ahead
|
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1
|
2872
|
December 22, 2016
|
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Chemical, gravitational and nuclear energies are nothing but potential energies for different types of forces in nature. Explain this statement clearly with examples
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0
|
1094
|
August 18, 2016
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Explain why these situations happen
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1
|
1081
|
August 18, 2016
|
|
A stone of mass 0.25 kg tied to the end of a string is whirled round in a circle of radius 1.5 m with speed 40 rev./min in a horizontal plane
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1
|
10563
|
August 18, 2016
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|
Two masses 8 kg and 12 kg are connected at the two ends of a light inextensible string that goes over a friction less pulley. Find the acceleration of the masses and the tension in the string when the masses are released
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0
|
11696
|
August 18, 2016
|
|
Two bodies A and B of masses 10 kg and 20 kg respectively kept on a smooth, horizontal surface are tied to the ends of a light string
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1
|
4111
|
August 18, 2016
|
|
An object is moving on a circular path in horizontal plane. Radius of the paths is r and constant speed is v. Deduce expression for centripetal acceleration
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0
|
2149
|
August 18, 2016
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Derive a relation for the velocity at the lowest point and the highest point for looping the loop of a vertical circle
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0
|
8814
|
August 18, 2016
|
|
Define angle of friction
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1
|
14839
|
August 18, 2016
|
|
Define coefficient of friction and angle of friction and hence derive a relation between them
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0
|
28841
|
August 18, 2016
|
|
Define centripetal acceleration. Find the expression for it. Give one example of centripetal force
|
|
0
|
23808
|
August 18, 2016
|
|
A 70 kg man stands in contact against the inner wall of a hollow cylindrical drum of radius 3 m rotating about its vertical axis with 200 rev/min
|
|
1
|
5808
|
August 18, 2016
|
|
A train rounds an unbanked circular bend of radius 30 m at a speed of 54 kmh-1. The mass of the train is 106 kg. What provides the centripetal force required for this purpose ? The engine or the rails ? What is the angle of banking to prevent wearing out
|
|
0
|
4016
|
August 18, 2016
|
|
An aircraft executes a horizontal loop at a speed of 720 km/h with its wings banked at 15°. What is the radius of the loop?
|
|
0
|
17001
|
August 18, 2016
|