A hot air balloon contains 85,000 moles of air. To what temperature must the

air be heated to fill a volume of 2500 m at a pressure of 100 kPa? A. 260K

B. 2900 K C. 350 K

D. 0.35 K

What did johannes kepler contribute to the study of planets

a kg object and a kg object are separated by m. find the magnitude of the net gravitational force exerted by these objects on a kg object placed midway between them.

The principal limitation of wind power is unpredictability. True or False

A crate is hung from a spring with a force constant of 525 nm. this stretches the spring 0.30 m from its equilibrium position. what is the mass of the crate? use 10 m/s2

A child does 0.20 joule of work to compress the spring in a pop-up toy. if the mass of the toy is 0.010 kilogram, what is the maximum vertical height that the toy can reach after the spring is released?

Winston stands on the edge of a building's flat roof, 12 m above the ground, and throws a 147.0-g baseball straight down. the ball hits the ground at a speed of 18 m/s. what was the initial speed of the ball?

When is the zebra in motion when it is not moving

1) What happens when two negatively charged tape strips are placed near each other?

Claudia throws a baseball to her dog. Which free-body diagram shows the baseball when it's flying horizontally in midair? (Assume no air resistance.)

What causes an air conditioned to turn on