pl answer Q 19 g. A uniform m solid hemisphere of radius r and mass M is pulled by means of a string so that it moves
with a uniform velocity. If U is the coefficient Of friction between the hemisphere and surface, then
sin e =
The centre of mass of a hemisphere is located at a distance 3r/8 from the centre.
30 +
The value of u is
A disc of mass 'm' and radius R is rolling with centres velocity vo an a flash horizontal floor when
it hits the Step in the floor of height R/4. The corner of the step is sufficicntly rough to prevent any
slipping of the disc agains itself. The velocity of centr of the disc just after the impact is
6
3. A small pulley of radius 20cm and moment of inertia 0.32kg-m2 is used so hang a 2kg mass with the
help of mass less string. If the block is released for no slipping condition acceleration of the block
will be '2r'. Then 'x' .
22• A sphere of radius r is projected up an inclined plane for which - tano with a velocity
Amor + xvo
. x is
). The total time of rise is
18gsin6
and initial angular velocity 00 (vo > roo
161
