Question

Q11. Earth is rotating about its north-south axis with a period of 24 hours. The density of the Earth is not uniform. Generally the density is higher in the core than on the surface. If the mass of the Earth is re-distributed so that the density is the same everywhere, its rotational period should be

A. longer than 24 hours

B. shorter than 24 hours

C. the same

D. not enough information to determine the outcome

E. either A. or B., dependent on whether there is energy dissipation during the mass re- distribution

Q12. A block is sliding down an inclined plane that makes an angle a with the flat surface. The block and the inclined plane has a kinetic friction coefficient mk = 0.15 . The block is seen to slide down with a constant speed. What is the angle a ?

A. 8.53^o

B. 81.47^o

C. Dependent on the mass of the block, hence insufficient information

D. Not possible to slide down with a constant speed

E. 10.36^o

Q13. A block with mass 0.5 kg moving at v_x=1 m/sec collides head on with another block with mass 1 kg moving at v_x= ? 1 m/sec. Suppose the collision is inelastic and can therefore dissipate energy, what is the maximum amount of energy that can be dissipated?

A. 0.75 J

B. 0.25 J

C.   0.67 J

D. 0.375 J

E. None of the above

Answer 1

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