Calculate the density of paraffin oil, if a glass capilla de 0.25mm dipped in paratin oil of the surface tension 0.0245
to a height of 4cm. (Angle of contact of paraffin oil with
and g=9.8m​

Estimate the kinetic energy of mars with respect to the sun as the sum of two terms, that due to its daily rotation about its axis, and that due to its yearly revolution about the sun. (assume mars is a uniform sphere with mass = 6.4×10 to the power of 23 kg, radius = 3.4×10 to the power of 6 m, rotation period = 24.7 hours, orbital period = 686 days and is 2.3×10 to the power of 8 km from the sun.)