Starting from rest, a body slides down a 45° inclined plane in twice the time it takes to slide down the same distance in the absence of friction.The coefficient of friction between the body and the inclined plane is [1988]
Two bodies of masses m and 4m are moving with equal kinetic energies. The ratio of their linear momenta will be [1988]
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A body of mass 5 kg explodes at rest into three fragments with masses in the ratio 1 : 1 : 3. The fragments with equal masses fly in mutually perpendicular directions with speeds of 21 m/s.The velocity of heaviest fragment in m/s will be
A 4 kg mass and 1 kg are moving with equal kinetic energies. The ratio of the magnitudes of their linear momenta is [1989]
A 600 kg rocket is set for a vertical firing. If the exhaust speed is 1000 ms^{–1} , the mass of the gas ejected per second to supply the thrust needed to overcome the weight of rocket is [1990]
A particle of mass m is moving with a uniform velocity v_{1}. It is given an impulse such that its velocity becomes v_{2}. The impulse is equal to [1990]
A heavy uniform chain lies on horizontal table top. If the coefficient of friction between the chain and the table surface is 0.25, then the maximum fraction of the length of the chain that can hang over one edge of the table is [1991]
Physical independence of force is a consequence of[1991]
Consider a car moving along a straight horizontal road with a speed of 72 km/h. If the coefficient of static friction between the tyres and the road is 0.5, the shortest distance in which the car can be stopped is (taking g = 10 m/s^{2}) [1992]
A particle of mass M is moving in a horizontal circle of radius R with uniform speed V. When it moves from one point to a diametrically opposite point, its [1992]
A monkey is decending from the branch of a tree with constant acceleration. If the breaking strength is 75% of the weight of the monkey, the minimum acceleration with which monkey can slide down without breaking the branch is [1993]
A block has been placed on an inclined plane with the slope angle θ, block slides down the plane at constant speed. The coefficient of kinetic friction is equal to [1993]
A shell is fired from a cannon, it explodes in mid air, its total [1994]
A satellite in a force free space sweeps stationary interplanetary dust at a rate (dM/dt) = αv. The acceleration of satellite is [1994]
If the force on a rocket moving with a velocity of 300 m/sec is 345 N, then the rate of combustion of the fuel, is [1995]
What will be the maximum speed of a car on a road turn of radius 30 m if the coefficient of friction between the tyres and the road is 0.4 (Take g = 9.8 m/s2) [1995]
A 10 N force is applied on a body produces an acceleration of 1 m/s^{2}. The mass of the body is [1996]
A ball of mass 150 g, moving with an acceleration 20 m/s^{2}, is hit by a force, which acts on it for 0.1 sec. The impulsive force is [1996]
A mass of 1 kg is suspended by a thread. It is (i) lifted up with an acceleration 4.9 m/s^{2}, (ii) lowered with an acceleration 4.9 m/s2.The ratio of the tensions is [1998]
A bullet is fired from a gun. The force on the bullet is given by F = 600 – 2 × 10^{5 }t where, F is in newton and t in second. The force on the bullet becomes zero as soon as it leaves the barrel.What is the average impulse imparted to the bullet?[1998]
A 5000 kg rocket is set for vertical firing. The exhaust speed is 800 ms^{–1}. To give an initial upward acceleration of 20 ms^{–2}, the amount of gas ejected per second to supply the needed thrust will be (g = 10 ms^{–2}) [1998]
Two blocks m_{1} = 5 gm and m_{2} = 10 gm are hung vertically over a light frictionless pulley as shown here. What is the acceleration of the masses when they are left free? [2000] (where g is acceleration due to gravity)
A person slides freely down a frictionless inclined plane while his bag falls down vertically from the same height. The final speeds of the man (V_{M}) and the bag (V_{B}) should be such that [2000]
A block of mass 1 kg lies on a horizontal surface in a truck the coefficient of static friction between the block and the surface is 0.6. If the acceleration of the truck is 5 m/s^{2}, the frictional force acting on the block is
If a cricketer catches a ball of mass 150 gm moving with a velocity of 20 m/s, then he experiences a force of (Time taken to complete the catch is 0.1 sec.)[2001]
A lift weighing 1000 kg is moving upwards with an accelertion of 1 m/s^{2}. The tension in the supporting cable is [2002]
A 100 N force acts horizontally on a block of 10 kg placed on a horizontal rough surface of coefficient of friction μ = 0.5. If the acceleration due to gravity (g) is taken as 10 ms^{–2}, the acceleration of the block (in ms^{–2}) is [2002]
A man weighing 80 kg, stands on a weighing scale in a lift which is moving upwards with a uniform acceleration of 5m/s^{2}. What would be the reading on the scale ? (g = 10 m/s^{2}) [2003]
A monkey of mass 20 kg is holding a vertical rope. The rope will not break when a mass of 25 kg is suspended from it but will break if the mass exceeds 25 kg. What is the maximum acceleration with which the monkey can climb up along the rope ? (g = 10 m/s^{2}) [2003]
The coeffici ent of static friction , μ_{s}, between block A of mass 2 kg and the table as shown in the figure is 0.2. What would be the maximum mass value of block B so that the two blocks do not move? The string and the pulley are assumed to be smooth and massless. (g = 10 m/s^{2}) [2004]
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102 videos411 docs121 tests
