When shearing force is applied on a body, then the elastic potential energy is stored in it. On removing the force, this energy
Converts into kinetic energy
Converts into heat energy
Remains as potential energy
None of the above
If the force constant of a wire is $K,$ the work done in increasing the length of the wire by $l$ is
The strain energy stored in a body of volume $V$ due to shear strain $\phi$ is (shear modulus is $\eta$ )
A $2 \,m$ long rod of radius $1 \,cm$ which is fixed from one end is given a twist of $0.8$ radians. The shear strain developed will be
Which of the following is true for elastic potential energy density
The work done per unit volume to stretch the length of area of cross-section $2 \,mm ^2$ by $2 \%$ will be ....... $MJ / m ^3$ $\left[Y=8 \times 10^{10} \,N / m ^2\right]$