The gravitational force between the Sun (mass = 1. 99 Ă— 1030 kg) and Mercury (mass = 3. 30 Ă— 1023 kg) is 8. 99 Ă— 1021 N. How far is Mercury from the Sun? 6. 98 Ă— 1010 km 6. 98 Ă— 107 km 4. 87 Ă— 1013 km 4. 87 Ă— 1024 km.

50 g of ice at 0°c is dropped in a beaker containing 100 g of water at 0°c. what will be the contents of the beaker after 5 hours? assume that the room temperature is 0°c.

Atemperature inversion can cause a warm air mass to move over a colder air mass. this traps the colder air mass and prevents surface air from rising. this may result in which of these? a) smog b) acid rain c) freezing rain d) a thunderstorm

Which of the following are forms of phase changes a. freezing b. condensation c. heating d. exchanging