Author Question: A +7.5-nC point charge is 5.0 cm from a -9.4-C point charge in your laboratory in California. How ... (Read 20 times)

Arii_bell · **on:** Jul 29, 2018

A +7.5-nC point charge is 5.0 cm from a -9.4-C point charge in your laboratory in California.

How much work would you have to do if you left the +7.5-nC charge in the lab but took the -9.4-C charge to New York City? (k = 1/40 = 9.0 109 N m2/C2 )

Question 2

A gas of helium atoms (each of mass 6.65 10-27 kg) are at room temperature of 20.0C.

What is the de Broglie wavelength of the helium atoms that are moving at the root-mean-square speed? (h = 6.626 10-34 J s, the Boltzmann constant is 1.38 10-23 J/K)
A) 7.38 10-11 m
B) 3.99 10-10 m
C) 1.04 10-10 m
D) 5.22 10-11 m
E) 2.82 10-10 m