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.
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An electron micrograph showing transcription of a gene.