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General
Easy
Question
A man crosses a river from point ‘A’. If he swims perpendicular to the bank, he reaches point C 10minutes later. If he swims at angle a to ‘AB’ he reaches B in 12.5 minutes.
Find the direction of the boat with the vertical.
The correct answer is:
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A river is flowing from west to east at a speed of 5m/min. In what direction should a man on the south bank of the river capable of swimming at 10m/min, in still water should swim to cross the river in shortest time.
A river is flowing from west to east at a speed of 5m/min. In what direction should a man on the south bank of the river capable of swimming at 10m/min, in still water should swim to cross the river in shortest time.
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Two objects ‘A’ and ‘B’ are moving along the directions as shown in figure. Find the relative velocity of B with respect to A.
Two objects ‘A’ and ‘B’ are moving along the directions as shown in figure. Find the relative velocity of B with respect to A.
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A plank is moving on the ground with velocity ‘V1 ’ and a block is moving on the plank with velocity ‘V2 ’ relative to the plank. What will be the actual velocity of the block.
A plank is moving on the ground with velocity ‘V1 ’ and a block is moving on the plank with velocity ‘V2 ’ relative to the plank. What will be the actual velocity of the block.
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Two cars A and B are moving with a velocity of 50m/s in opposite directions along the same path. Find the relative velocity of ‘A’ with respect to ‘B’.
Two cars A and B are moving with a velocity of 50m/s in opposite directions along the same path. Find the relative velocity of ‘A’ with respect to ‘B’.
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If two cars A and B are travelling with velocities 4m/s and 3m/s in same direction then velocity of car A with respect to car B is ..
If two cars A and B are travelling with velocities 4m/s and 3m/s in same direction then velocity of car A with respect to car B is ..
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The angle made by instantaneous velocity with the horizontal b is ...
The angle made by instantaneous velocity with the horizontal b is ...
physics-General
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Assertion : When a bicycle is in motion, the force of friction exerted by the ground on the two wheels is always in forward direction.
Reason : The frictional force acts only when the bodies are in contact.
Assertion : When a bicycle is in motion, the force of friction exerted by the ground on the two wheels is always in forward direction.
Reason : The frictional force acts only when the bodies are in contact.
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A rough vertical board has an acceleration ‘a’ so that a2 kg block pressing against it does not fall. The coefficient of friction between the block and the board should be :
A rough vertical board has an acceleration ‘a’ so that a2 kg block pressing against it does not fall. The coefficient of friction between the block and the board should be :
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Block A weighing 100 kg rests on a block B and is tied with a horizontal string on the wall at C. Block B weighs 200 kg. The coefficient of friction between A and B is 0.25 and between B and the surface is 1/3. The horizontal force P necessary to move the block B should be (g = 10 m/s2) :
Block A weighing 100 kg rests on a block B and is tied with a horizontal string on the wall at C. Block B weighs 200 kg. The coefficient of friction between A and B is 0.25 and between B and the surface is 1/3. The horizontal force P necessary to move the block B should be (g = 10 m/s2) :
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A body of weight 50 N placed on a horizontal surface is just moved by a force of 28.2 N. The frictional force and the normal reaction are :
A body of weight 50 N placed on a horizontal surface is just moved by a force of 28.2 N. The frictional force and the normal reaction are :
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If the normal force is doubled, the coefficient of friction is :
If the normal force is doubled, the coefficient of friction is :
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physics-
An insect crawls up a hemispherical surface very slowly (see the figure). The coefficient of friction between the insect and the surface is 1/3. If the line joining the centre of the hemispherical surface to the insect makes an angle a with the vertical, the maximum possible value of a is given by :
An insect crawls up a hemispherical surface very slowly (see the figure). The coefficient of friction between the insect and the surface is 1/3. If the line joining the centre of the hemispherical surface to the insect makes an angle a with the vertical, the maximum possible value of a is given by :
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A 40 kg slab rests on a frictionless floor as shown in the figure. A 10 kg block rests on the top of the slab. The static coefficient of friction between the block and slab is 0.60 while the kinetic friction is 0.40. The 10 kg block is acted upon by a horizontal force 100 N. If g = 9.8 m/s2 , the resulting acceleration of the slab will be :
A 40 kg slab rests on a frictionless floor as shown in the figure. A 10 kg block rests on the top of the slab. The static coefficient of friction between the block and slab is 0.60 while the kinetic friction is 0.40. The 10 kg block is acted upon by a horizontal force 100 N. If g = 9.8 m/s2 , the resulting acceleration of the slab will be :
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A body of mass m rests on horizontal surface. The coefficient of friction between the body and the surface is µ. If the mass is pulled by a force P as shown in the figure, the limiting friction between body and surface will be :
A body of mass m rests on horizontal surface. The coefficient of friction between the body and the surface is µ. If the mass is pulled by a force P as shown in the figure, the limiting friction between body and surface will be :
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A block P of mass m is placed on a frictionless horizontal surface. Another block Q of same mass is kept on P and connected to the wall with the help of a spring of spring constant k as shown in the figure. µS is the coefficient of friction between P and Q. The blocks move together performing SHM of amplitude A. The maximum value of the friction force between P and Q is :
A block P of mass m is placed on a frictionless horizontal surface. Another block Q of same mass is kept on P and connected to the wall with the help of a spring of spring constant k as shown in the figure. µS is the coefficient of friction between P and Q. The blocks move together performing SHM of amplitude A. The maximum value of the friction force between P and Q is :
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