A projectile leaves the muzzle of a projectile launcher with a speed of 35m/s [the launcher is oriented vertically].

a) What is the maximum height reached by the projectile?

b) How long did it take the projectile to reach its maximum height?

c) How long was the projectile in the air [ttot]?

In a system, when potential energy decreases, then entropy also decreases. true false

What are the starting materials for nuclear fission? two small nuclei two large nuclei a neutron and a large nucleus a neutron and a small nucleus

Uranium has two naturally occurring isotopes. 238u has a natural abundance of 99.3% and 235u has an abundance of 0.7%. it is the rarer 235u that is needed for nuclear reactors. the isotopes are separated by forming uranium hexafluoride uf6, which is a gas, then allowing it to diffuse through a series of porous membranes. 235uf6 has a slightly larger rms speed than 238uf6 and diffuses slightly faster. many repetitions of this procedure gradually separate the two isotopes. what is the ratio of the rms speed of 235uf6 to that of 238uf6? express your answer to five significant figures.