60 543
Assignments Done
Successfully Done
In April 2018

Answer to Question #1844 in Mechanics | Relativity for matt sturm

Question #1844
A net force of 1.6×10−15 N acts on an electron over a displacement of 5.0 cm, in the same direction as the net force. (a) What is the change in kinetic energy of the electron? (b) If the electron was initially at rest, what is the speed of the electron? An electron has a mass of 9.1×10−31 kg. answer part a) in joules and part b) in meters per second.

Expert's answer
a) the change in kinetic energy equals to the work done by the force (if the potential energy remains the same):
A = F s = 1.6×10−15[N] * 0.05 [m] = 0.8×10−16J.

b) if the electron was initially at rest, the speed of the electron can be found from the expression
A = mv2/2: v = √(2A/m) = √(2*0.8×10−16J/9.1×10−31) = 0.17×1015m/s

Need a fast expert's response?

Submit order

and get a quick answer at the best price

for any assignment or question with DETAILED EXPLANATIONS!


No comments. Be first!

Leave a comment

Ask Your question

Privacy policy Terms and Conditions