5. The temperature of air in a foundry increases when molten metals cool and solidify. Suppose 9.9 X 10 J of energy is added to the sur- rounding air by the solidifying metal. The air's temperature increases by 55 K, and the air has a specific heat capacity of 1.0 x 100 J/kg. K. a. What is the mass of the heated air? b. Assuming a density of 1.29 kg/m', what is the heated air's volume?​

An object moves from position +34m to the position -15m in 15 seconds. what is the total displacement? what is the total velocity?

The coulomb's law explains which of the following? select all the force between two charged objects is inversely proportional to the charge on each object. the force between two charged objects is directly proportional to the charge on each object. the force between two charged objects is directly proportional to the distance separating them. the force between two charged objects is inversely proportional to the square of the distance separat coulomb's law is similar to newton's 2nd law. if the force between two objects is f and the charge on both objects is doubled, the new force between the would now be 2f. if the force between two objects is 2f and the distance separating them is doubled, the new force between the objects would now o the be zf.

World class speed skaters can skate a 3,000-m course in about 4 minutes.what is their average speed for this course? a. 12.5 m/sb. 1.33 m/sc. 1.25 m/sd. 13.3 m/s