Which of the following statements are true? 1. Liquid water expands with increasing temperature above 4°C.
2. Liquid water expands with increasing temperature between 0°C and 4°C.
3. Water contracts as it freezes at 0°C.
4. Solid ice is less dense than liquid water.

The earth remains in orbit around the sun due to the force of gravity. how does the force of gravity exerted by the sun on the earth compare to the force of gravity exerted by the earth on the sun?

For the car in the picture ,in which direction is the normal force? -into the screen -down -out of the screen -up

Two manned satellites approaching one another at a relative speed of 0.550 m/s intend to dock. the first has a mass of 2.50 ✕ 103 kg, and the second a mass of 7.50 ✕ 103 kg. assume that the positive direction is directed from the second satellite towards the first satellite. (a) calculate the final velocity after docking, in the frame of reference in which the first satellite was originally at rest.(b) what is the loss of kinetic energy in this inelastic collision? (c) repeat both parts, in the frame of reference in which the second satellite was originally at rest. final velocity(d) loss of kinetic energy = ?