Suppose you wanted to hold up an electron against the force of gravity by the attraction of a fixed proton some distance above it.
How far above the electron would the proton have to be? (k = 1/40 = 9.0 109 N m2/C2, e = 1.6 10-19 C, mproton = 1.67 10-27 kg, melectron = 9.11 10-31 kg)
A) 4.6 m B) 3.7 m C) 5.1 m D) 2.3 m E) 1.5 m
Question 2
A rock is projected upward from the surface of the Moon, at time t = 0 s, with an upward velocity of 30.0 m/s. The acceleration due to gravity at the surface of the Moon is 1.62 m/s2, and the Moon has no atmosphere.
The height of the rock when it is descending with a speed of 20.0 m/s is closest to A) 115 m.
B) 125 m.
C) 135 m.
D) 145 m.
E) 154 m.
Absorption of light energy by an electron
scanning electron micrograph showing an ovum (pink) released by the ovary at ovulation surrounded by
Electron Microscope
Put two tennis balls in a sock, then tie a knot in the end of the sock to hold the balls together.
Attraction between water molecules showing polar covalent bonding.
Electron Microscope