How many atoms of each element in the chemical formula Ca(OH)2?

Ahot-air balloonist, rising vertically with a constant speed of 5.00 m/s releases a sandbag at the instant the balloon is 40.0 m above the ground. after it is released, the sandbag encounters no appreciable air drag. compute the velocity of the sandbag at 0.250 s after its release.

Which diagram correctly demonstrates the various forces acting on a ball moving horizontally with some speed?

Suppose a comet has an orbital period of 309.1 years around the sun. what is it’s average distance from the sun?