A pendulum bob of mass 50 gm is suspended from the ceiling of an elevator. The tension in the string if the elevator goes up with uniform velocity is approximately 

(1) 0.30 N

(2) 0.40 N

(3) 0.42 N

(4) 0.50 N

Concept Questions :-

Application of laws
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The average force necessary to stop a bullet of mass 20 g moving with a speed of 250 m/s, as it penetrates into the wood for a distance of 12 cm is 

(1) 2.2 × 103 N

(2) 3.2 × 103 N

(3) 4.2 × 103 N

(4) 5.2 × 103 N

Concept Questions :-

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A man measures time period of a pendulum (T) in stationary lift. If the lift moves upward with acceleration g4, then new time period will be 

(1) 2T5

(2) 5T2

(3) 52T

(4) 25T

Concept Questions :-

Application of laws
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If rope of lift breaks suddenly, the tension exerted by the surface of lift (a = acceleration of lift) 

(1) mg

(2) m(g + a)

(3) m(ga)

(4) 0

Concept Questions :-

Types of forces
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A lift of mass 1000 kg is moving with an acceleration of 1 m/s2 in upward direction. Tension developed in the string, which is connected to the lift, is 

(1) 9,800 N

(2) 10,000 N

(3) 10,800 N

(4) 11,000 N

Concept Questions :-

Types of forces
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A lift accelerated downward with acceleration 'a'. A man in the lift throws a ball upward with acceleration a0(a0 < a). Then acceleration of ball observed by observer, which is on earth, is 

(1) (a + a0) upward

(2) (aa0) upward

(3) (a + a0) downward

(4) (aa0) downward

Concept Questions :-

Application of laws
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A lift is moving down with acceleration a. A man in the lift drops a ball inside the lift. The acceleration of the ball as observed by the man in the lift and a man standing stationary on the ground are respectively 

(1) g, g

(2) ga, ga

(3) ga , g

(4) a, g

Concept Questions :-

Application of laws
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A monkey of mass 20kg 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/s2) 

(1) 10 m/s2

(2) 25 m/s2

(3) 2.5 m/s2

(4) 5 m/s2

Concept Questions :-

Application of laws
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A plumb line is suspended from a ceiling of a car moving with horizontal acceleration of a. What will be the angle of inclination with vertical 

(1) tan–1(a/g)

(2) tan–1(g/a)

(3) cos–1(a/g)

(4) cos–1(g/a)

Concept Questions :-

Pseudo force
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A body of mass 2 kg has an initial velocity of 3 meters per second along OE and it is subjected to a force of 4 N in a direction perpendicular to OE. The distance of the body from O after 4 seconds will be 

(1) 12 m

(2) 20 m

(3) 8 m

(4) 48 m

Concept Questions :-

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