|
A block of mass 25 kg is raised by a 50 kg man in two different ways as shown in figure
|
|
1
|
3747
|
December 22, 2016
|
|
A block of mass 15 kg is placed on a long trolley
|
|
1
|
3366
|
December 22, 2016
|
|
If the speed of stone is increased beyond the maximum permissible value
|
|
1
|
1186
|
December 22, 2016
|
|
A block of mass M is held against a rough vertical wall by pressing it with a finger
|
|
1
|
5718
|
December 22, 2016
|
|
A body placed on a rough inclined plane just begins to slide
|
|
1
|
8460
|
December 22, 2016
|
|
Explain why a horse cannot pull a cart and run in empty space?
|
|
1
|
11351
|
December 22, 2016
|
|
Figure below shows the position-time graph of a particle of mass 4 kg
|
|
1
|
3779
|
December 22, 2016
|
|
Give the magnitude and direction of the net force acting on a stone of mass 0.1 kg
|
|
1
|
3115
|
December 22, 2016
|
|
Give the magnitude and direction of the net force acting on
|
|
1
|
2299
|
December 22, 2016
|
|
A pebble of mass 0.05 kg is thrown vertically upwards
|
|
1
|
7799
|
December 22, 2016
|
|
Ten one-rupee coins are put on top of each other on a table
|
|
1
|
3008
|
December 22, 2016
|
|
A person of mass 50 kg
|
|
1
|
6769
|
December 22, 2016
|
|
A passenger of mass 72.2 kg
|
|
1
|
4447
|
December 22, 2016
|
|
A woman throws an object of mass 500 g with a speed of 25 m/s
|
|
1
|
8783
|
December 22, 2016
|
|
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?
|
|
0
|
5780
|
December 22, 2016
|
|
Why are porcelain objects wrapped in paper or straw before packing for transportation?
|
|
0
|
2838
|
December 22, 2016
|
|
A person driving a car suddenly applies the brakes on seeing a child on the road ahead
|
|
1
|
3025
|
December 22, 2016
|
|
Chemical, gravitational and nuclear energies are nothing but potential energies for different types of forces in nature. Explain this statement clearly with examples
|
|
0
|
1263
|
August 18, 2016
|
|
Explain why these situations happen
|
|
1
|
1323
|
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
|
|
1
|
11245
|
August 18, 2016
|
|
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
|
|
0
|
12642
|
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
|
|
1
|
5143
|
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
|
|
0
|
2465
|
August 18, 2016
|
|
Derive a relation for the velocity at the lowest point and the highest point for looping the loop of a vertical circle
|
|
0
|
11274
|
August 18, 2016
|
|
Define angle of friction
|
|
1
|
16046
|
August 18, 2016
|
|
Define coefficient of friction and angle of friction and hence derive a relation between them
|
|
0
|
33259
|
August 18, 2016
|
|
Define centripetal acceleration. Find the expression for it. Give one example of centripetal force
|
|
0
|
26362
|
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
|
6143
|
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
|
4341
|
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
|
17492
|
August 18, 2016
|