One end of a massless rope, which passes over a massless and frictionless pulley P is tied to a hook C while the other end is free. Maximum tension that the rope can bear is 360 N. with what value of minimum safe acceleration (in ms–2) can a monkey of 60 kg move down on the rope 

(1) 16

(2) 6

(3) 4

(4) 8

Concept Questions :-

Application of laws
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A light string passing over a smooth light pulley connects two blocks of masses m1 and m2 (vertically). If the acceleration of the system is g/8 then the ratio of the masses is 

(1) 8 : 1

(2) 9 : 7

(3) 4 : 3

(4) 5 : 3

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Application of laws
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Two masses m1 = 5 kg and m2 = 4.8 kg tied to a string are hanging over a light frictionless pulley. What is the acceleration of the masses when they are free to move (g = 9.8 m/s2) 

(1) 0.2 m/s2

(2) 9.8 m/s2

(3) 5 m/s2

(4) 4.8 m/s2

Concept Questions :-

Application of laws
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A block of mass 4 kg is suspended through two light spring balances A and B. Then A and B will read respectively 

(1) 4 kg and zero kg

(2) Zero kg and 4 kg

(3) 4 kg and 4 kg

(4) 2 kg and 2 kg

Concept Questions :-

Spring force
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Two masses M and M/2 are joint together by means of a light inextensible string passes over a frictionless pulley as shown in figure. When bigger mass is released the small one will ascend with an acceleration of 

(1) g/3

(2) 3g/2

(3) g/2

(4) g

Concept Questions :-

Application of laws
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Two masses m1 and m2 (m1 > m2) are connected by massless flexible and inextensible string passed over massless and frictionless pulley. The acceleration of centre of mass is 

(1) m1m2m1+m22g

(2) m1m2m1+m2g

(3) m1+m2m1m2g

(4) Zero

Concept Questions :-

Types of forces
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The mass of a body measured by a physical balance in a lift at rest is found to be m. If the lift is going up with an acceleration a, its mass will be measured as 

(1) m1ag

(2) m1+ag

(3) m

(4) Zero

Concept Questions :-

Pseudo force
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Three weights W, 2W and 3W are connected to identical springs suspended from a rigid horizontal rod. The assembly of the rod and the weights fall freely. The positions of the weights from the rod are such that 

(1) 3W will be farthest

(2) W will be farthest

(3) All will be at the same distance

(4) 2W will be farthest

Concept Questions :-

Spring force
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When forces F1, F2, F3 are acting on a particle of mass m such that F2 and F3 are mutually perpendicular, then the particle remains stationary. If the force F1 is now removed then the acceleration of the particle is 

(1) F1/m

(2) F2F3/mF1

(3) (F2F3)/m

(4) F2/m

Concept Questions :-

Application of laws
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Consider the following statement: When jumping from some height, you should bend your knees as you come to rest, instead of keeping your legs stiff. Which of the following relations can be useful in explaining the statement?

1. ΔP1=ΔP2

2. ΔE=Δ(PE+KE)=0

3. FΔt=mΔv

4. ΔxΔF

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