Two hot cubes are at same
temperature and
both are cooled by forced
convetion the cube are made
from the same material
but one has side of L metre
and other one 2L metre.
which cube is at quicker
rate of cooling
A ball is bouncing down
a flight of stairs.The
coefficiate of restitution
is e.The height of each step
d and the ball descends
one step at each bounce.
After each bounce it rebounds
to heigt h above the next
lower step.The height h is/
large enough compare with
width of a step that
the empacts are effectively
head on.show that
h=(d/(1−e^2 ))
Two similar spherical
bodies of radius R and 2R
are initially are at same
temperature.if they are
kept to cool under the same
condition.show qualitatively
which of the two spherical
body will cool faster.
Two similar ball of mass
m attached by silk thread
of length a and carry
similar charge q.assume θ is
small enough that
tanθ≈sinθ to this
approximation,show
that X=(((qa)/(2πε_0 mg)))^(1/3)
where X is distance of
separation.