Apositron is an elementary particle identical to an electron except that its charge is +e. an electron and a positron can rotate about their center of mass as if they were a dumbbell connected by a massless rod. what is the orbital frequency for an electron and a positron 1.0nm apart?

Explanation:

k = Coulomb constant =

q = Charge of electron =

d = Distance = 1 nm

v = Velocity of positron

In this system the centripetal and electrical forces are conserved

Distance to orbit is given by

Time is given by

Frequency is given by

The orbital frequency is

work: w = fd (given)

work done by chet   =50*1 = 50 j

work done by mika =40*2 = 80 j

work done by sara =30*1.5 = 45 j

work done by bill =60*0.5 = 30 j

students in order from the greatest amount of work done to the least is mika> chet> sara> bill

hence option (b) is correct.

15.3 cos 65 degrees trig