A 2 kg box is put on an inclined plane at 27° with the horizontal. The surface is frictionless. What is the acceleration of the box down the plane and what is the magnitude of the force exerted by the inclined plane on the box?

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.)