Maximum efficiency of a screw jack for the angle of friction ?, is

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Maximum efficiency of a screw jack for the angle of friction ?, is
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1. If the radius of the earth is 600 km the height of a mountain above sea level at the top of which a beat seconds pendulum at sea level, looses 27 seconds a day, is
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A. 500 metres
B. 1000 metres
C. 1500 metres
D. 2000 metres
E. 25000 metres.

4. A uniform rod 9 m long weighing 40 kg is pivoted at a point 2 m from one end where a weight of 120 kg is suspended. The required force acting at the end in a direction perpendicular to rod to keep it equilibrium, at an inclination 60� with horizontal, is
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A. 40 kg
B. 60 kg
C. 10 kg
D. 100 kg.

5. u₁ and u₂ are the velocities of approach of two moving bodies in the same direction and their corresponding velocities of separation are v₁ and v₂. As per Newton's law of collision of elastic bodies, the coefficient of restitution (e) is given by
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A.
B.
C.
D.

6. Pick up the correct statement from the following :
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A. Nature plays an important role in the launch of a satellite
B. The earth's gravity reduces the speed of a satellite by 32 km per second
C. The gravitational force relents as the satellite climbs higher
D. The gravitational intensity declines with height
E. All the above.

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