Awave with a period of 1/3 second has a frequency of

Ahot-air balloon is drifting straight downward with a constant speed of 2.40 m/s. when the balloon is 7.63 m above the ground, the balloonist decides to drop one of the ballast sandbags to the ground below. how much time elapses before the sandbag hits the ground?

What is a subatomic particle with a negative charge and very little mass?

The total amount of energy contained in an object