You throw a ball straight up at 45 m/s. how many seconds elapse before it is traveling downward at 9 m/s?

What is the change in internal energy if 60 J of heat are added to a system and the system does 40 J of work on its surroundings? Use AU = Q-W.

A ball is thrown straight up. What can be said about the sign of work done by the force exerted by gravity while the ball moves up and then down?

What is the correct displacement for the following vectors: 4 km south, 2 km north, 5 km south, and 5 km north? 2 km south 16 km total 11 km west 6 km south

In a total-immersion measurement of a woman's density, she is found to have a mass of 63 kg in air and an apparent mass of 0.0975 kg when completely submerged with lungs almost totally empty. A. What mass, in kg, of water does she displace? B.

A car is initially travelling at 12.1m/s It accelerates at a rate of - 3.9m/s^2 for 7 seconds. What is it's final velocity?

Which of the following planets has the highest surface temperature as compared to the others? Earth Jupiter Mars Venus

Steel is made of atoms of iron and carbon. Would iron and carbon form metallic bonds? Explain your answer choice.

A sprinter runs 200m west and 100 m east her displacement is

An ideal gas is at a pressure 1.00 Ã 105 n/m2 and occupies a volume 2.00 m3. if the gas is compressed to a volume 1.00 m3 while the temperature remains constant, what will be the new pressure in the gas?

A bicyclist rides with a constant speed of 7 m/s. What is his initial speed?