Directions: Read each question carefully and answer 1. When the energy of a substance decreases, the motion of its molecules change. A substance has these 4 characteristics:
1. Molecules moving freely start to slow down
2. Collisions between molecules are less energetic
3. Intermolecular forces have more effect as molecules become closer
4. Molecules start vibrating in fixed positions

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.)