John Lester is at the park practicing his pitching. Since he doesn’t have a catcher, John wants to pitch the ball all the way around the Earth so he can catch it himself. Neglecting air drag and any obstacles that might be in the way, about how fast must the ball be moving? You may take the radius of the Earth to be 6400 km.

Explanation:

Let assume that John Lester has a height of 1.80 meters and throws the ball at 70 percent of John Lester's height. The time before the ball hits the soil is:

The initial horizontal velocity required to pitch the ball all the way around the Earth is:

the answer is false. this is because for ice to melt, it requires latent heat of melting. latent heat means heat energy required to change phase without any increase in temperatures. therefore, the ice will take energy from the environment to melt hence atmospheric temperatures will reduce.