1. Derive expression for
the variation of acceleration due to gravity with latitude. What would be the
time period of rotation of the earth to make the bodies at equator weightless?
2. State and explain
kepler’s laws of planetary motion.
3 .Define kinetic energy. Derive an
expression for it.
4 .The bob of a pendulum is released from a horizontal
position. If the length of the pendulum is 1 m, What is the speed with which
the bob reaches the lower most point, given that it dissipates 10% of the
initial energy against air resistance.
5 .Consider two blocks of masses m1
and m2 (m1 > m2) connected by an
inextensible string passing over a smooth frictionless pulley. Two blocks are
released from same level. At any instant ‘t’; If ‘x’ is the relative
displacement of the blocks, then find
(i)
work done by tension on ‘m1’
(ii)
work done by tension on ‘m2’
6 .A man standing on the edge of a roof
of a 20 m tall building projects a ball of mass 100 g vertically up with a
speed of 10 ms–1 and simultaneously throws another ball of same mass
vertically down with the same speed. Find the kinetic energy of each ball when
they reach the ground. (g = 10 ms–2)
No comments:
Post a Comment