Physics - W.E.P. Question with Solution | TestHub

(A) In the final configuration, energy of A is more than energy of B.

(P) A disc A is radius $R$ and a mass $m$ is rotating freely with angular velocity $\omega$. Another disc B of mass $2m$ and radius $R/2$ is kept gently on the disc A such that their axes coincide. Finally they rotate with same angular velocity.

(B) In the final configuration, energy of A is equal to energy of B.

(Q) B collides elastically with A on a smooth surface as shown. B has mass $2m$ and speed $v_0$, A has mass $m$ and is at rest.

(C) In final configuration energy of A is less than energy of B.

(R) A is a solid block of mass $m$ and specific heat capacity $S$ at temperature $T$ is given heat of $mST$. B is a solid block of mass $2m$ and specific heat capacity $S/2$ at temperature $T$ is given heat of $mST$. None of the bodies reach melting point.

(S) A is a wire of young's modulus $Y$ and radius $r$, length ${\ell }_0$. B is wire of young's modulus $2Y$, radius $r/2$ length ${\ell }_0$. Both are stretched by same force $F$.