What gas would you expect to be in the letter A blank? 1 point
Gas
Percentage by Volume
A
78%
21%
B
Argon
0.93%
Carbon Dioxide
Neon
Helium
Methane
0.036%
0.0018%
0.00052%
0.00015%
0.00011%
Krypton
Hydrogen
0.00005%
oxygen
nitrogen
carbon dioxide
ozone
This is a required question

An electron and a proton are held on an x axis, with the electron at x = + 1.000 m and the proton at x = - 1.000 m. part a how much work is required to bring an additional electron from infinity to the origin? express your answer with the appropriate units. part b if, instead of the second electron coming in from infinity, it is initially at x = + 20.00 m on the axis and is given an initial velocity of 100.0 m/s toward the origin, does it reach the origin? part c how close to the origin does it come?