$A$ block of mass $m$ slides down a plane inclined at an angle $\theta$ . Which of the following will $NOT$ increase the energy lost by the block due to friction?
Increasing the angle of inclination
Increasing the distance that the block travels
Increasing the accelertion due to gravity
Increasing the mass of the block
A knife of mass $m$ is at a height $x$ from a large wooden block. The knife is allowed to fall freely, strikes the block and comes to rest after penetrating distance $y$. The work done by the wooden block to stop the knife is ..............
A body is projected from ground at an angle ${\theta _1}$ with the horizontal with kinetic energy $K$. What is the potential energy of the body, when the velocity makes an angle ${\theta _2}$ with the horizontal?
A uniform cable of mass $‘M’$ and length $‘L’$ is placed on a horizontal surface such that its ${\left( {\frac{1}{n}} \right)^{th}}$ part is hanging below the edge of the surface. To lift the hanging part of the cable upto the surface, the work done should be
If a particle of mass $m$ is moving in a horizontal circle of radius $r$ with a centripetal force $( - k/{r^2})$, the total energy is
A block starts from rest at the top of frictionless slide at a height, $h_1$ above the ground. The block leaves the slide moving perfectly horizontally at a height $h_2$ above the ground. The block eventually hits the ground travelling at an angle $\theta = 30^o$ below the horizontal. Then