Q.1 An ice box made if 1.5cm thick Styrofoam has dimensions 60cmX30cm. It contains ice at 0°C and is kept in a room at 40°C. Find the rate at which the ice is melting . Latent heat of fusion of ice =3.36X105 J/kg and thermal conductivity of Styrofoam=0.4W/m-°C.
Q.2 All the particles of a body are situated at a distance R from the origin. The distance of the center of mass of the body from the origin is
Q.3 A particle travelling in a horizontal straight line has an acceleration of 2m/s2?