A second's pendulum is mounted in a rocket. Its period of oscillation decreases when the rocket 

(1) Comes down with uniform acceleration

(2) Moves round the earth in a geostationary orbit

(3) Moves up with a uniform velocity

(4) Moves up with uniform acceleration

Concept Questions :-

Application of laws
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Two balls of masses m1 and m2 are separated from each other by a powder charge placed between them. The whole system is at rest on the ground. Suddenly the powder charge explodes and masses are pushed apart. The mass m1 travels a distance s1 and stops. If the coefficients of friction between the balls and ground are same, the mass m2 stops after travelling the distance 

(1) s2=m1m2s1

(2) s2=m2m1s1

(3) s2=m12m22s1

(4) s2=m22m12s1

Concept Questions :-

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A force vector applied on a mass is represented as F=6i^8j^+10k^ and accelerates with 1 m/s2. What will be the mass of the body 

(1) 102kg

(2) 210kg

(3) 10 kg

(4) 20 kg

Concept Questions :-

Application of laws
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A cricket ball of mass 250 g collides with a bat with velocity 10 m/s and returns with the same velocity within 0.01 second. The force acted on bat is 

(1) 25 N

(2) 50 N

(3) 250 N

(4) 500 N

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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

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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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