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NEET UG PHYSICS MCQ: LAWS OF MOTION
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An object is placed on the surface of a smooth inclined plane of inclination . It takes time to reach the bottom of the inclined plane. If the same object is allowed to slide down rough inclined plane of same inclination , it takes time nt to reach the bottom where is a number greater than 1 . The coefficient of friction is given by
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Correct option: A
Option A () is correct because it is derived by comparing the acceleration of the object on the smooth and rough inclined planes and using the kinematic equation relating distance, acceleration, and time.
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(A): Two solid cylinders of different masses and radii take same time to roll down an inclined plane without slipping.
(R): Moment of inertia of two solid cylinders of different masses and radii about their natural axes are different. Given below are two statements:
Statement I: An elevator can go up or down with uniform speed when its weight is balanced with the tension of its cable.
Statement II: Force exerted by the floor of an elevator on the foot of a person standing on it is more than his/her weight when the elevator goes down with increasing speed.
In the light of the above statements, choose the correct answer from the options given below: A particle is projected with a velocity at an angle of . At the highest point, it explodes into three particles of equal masses. One goes vertically upwards with a velocity , the second particle goes vertically downwards. What is the velocity of third particle? A loaded coal wagon is moving on a level track at . Suddenly of coal is dropped out of the wagon. The final speed of the wagon is Assertion : Mass is a measure of inertia of the body in linear motion.
Reason : Greater the mass, greater is the force required to change its state of rest or of uniform motion. An air tight cage in which a bird is sitting is suspended from a spring balance. If the bird starts flying, then the reading of the balance will
(R): Moment of inertia of two solid cylinders of different masses and radii about their natural axes are different. Given below are two statements:
Statement I: An elevator can go up or down with uniform speed when its weight is balanced with the tension of its cable.
Statement II: Force exerted by the floor of an elevator on the foot of a person standing on it is more than his/her weight when the elevator goes down with increasing speed.
In the light of the above statements, choose the correct answer from the options given below: A particle is projected with a velocity at an angle of . At the highest point, it explodes into three particles of equal masses. One goes vertically upwards with a velocity , the second particle goes vertically downwards. What is the velocity of third particle? A loaded coal wagon is moving on a level track at . Suddenly of coal is dropped out of the wagon. The final speed of the wagon is Assertion : Mass is a measure of inertia of the body in linear motion.
Reason : Greater the mass, greater is the force required to change its state of rest or of uniform motion. An air tight cage in which a bird is sitting is suspended from a spring balance. If the bird starts flying, then the reading of the balance will