Problem 1 the van de graaff electrostatic generator develops a charge of approximately −1 × 10−5c and a pith ball has charge of approximately 1 × 10−9c. which of the following describes the relationship between the size of the force the van de graaff exerts on the pith ball and the size of the force the pith ball exerts on the van de graaff? select one of the following: (a) the van de graaff exerts a much larger force on the pith ball. (b) the pith ball exerts a much larger force on the van de graaff. (c) the forces have the same magnitude.

Standing side by side ,you and a friend step off a bridge at different times and fall for 1.6s to the water below.your friend goes first,and you follow after he has dropped a distance of 2.0m.when your friend hits the water,is the seperation between the two of you 2.0m or more than 2.0m? verify your answer with a calculation.

Compare the horizontal displacement of the two balls as they travel to the ground. what do you observe?

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.