Theta=?
a person in the passenger basket of a hot-air balloon throws a ball horizontally outward from the basket with speed 10 m/s
what initial velocity (magnitude and direction) does the ball have relative to a person standing on the ground if the hot-air balloon is rising at 2.8 m/s?
what initial velocity (magnitude and direction) does the ball have relative to a person standing on the ground if the hot-air balloon is descending at 2.8 m/s relative to the ground?

theta=?

Ahydroelectric plant takes energy from water and turns it into electrical energy. what are the transformations of energy in the water molecules that are used in the process of generating electricity this way?

The air that we breath is made mostly of which gaseous molecule

Afisherman notices that his boat is moving up and down periodically without any horizontal motion, owing to waves on the surface of the water. it takes a time of 2.20 s for the boat to travel from its highest point to its lowest, a total distance of 0.670 m . the fisherman sees that the wave crests are spaced a horizontal distance of 5.80 m apart. (a) how much is the wavelength? (b) find the period of the wave. (c) how fast are the waves traveling? (d) what is the amplitude a of each wave?