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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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3783
|
December 22, 2016
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A block of mass 15 kg is placed on a long trolley
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1
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3383
|
December 22, 2016
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If the speed of stone is increased beyond the maximum permissible value
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1
|
1214
|
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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5778
|
December 22, 2016
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A body placed on a rough inclined plane just begins to slide
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1
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8520
|
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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11424
|
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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3842
|
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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3148
|
December 22, 2016
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Give the magnitude and direction of the net force acting on
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1
|
2323
|
December 22, 2016
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A pebble of mass 0.05 kg is thrown vertically upwards
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1
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7820
|
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
|
3025
|
December 22, 2016
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A person of mass 50 kg
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1
|
6781
|
December 22, 2016
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A passenger of mass 72.2 kg
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1
|
4539
|
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
|
8787
|
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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5799
|
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
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2853
|
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
|
3038
|
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
|
1267
|
August 18, 2016
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Explain why these situations happen
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1
|
1348
|
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
|
11314
|
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
|
12717
|
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
|
5247
|
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
|
2492
|
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
|
11670
|
August 18, 2016
|
|
Define angle of friction
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1
|
16118
|
August 18, 2016
|
|
Define coefficient of friction and angle of friction and hence derive a relation between them
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0
|
33743
|
August 18, 2016
|
|
Define centripetal acceleration. Find the expression for it. Give one example of centripetal force
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|
0
|
26905
|
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
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|
1
|
6155
|
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
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0
|
4360
|
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?
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|
0
|
17518
|
August 18, 2016
|