Author Question: A particle is moving with a certain speed. Its speed and energy are being measured with respect to ... (Read 107 times)

jlmhmf · **on:** Jul 29, 2018

A particle is moving with a certain speed. Its speed and energy are being measured with respect to Earth. When the particle's speed doubles, the energy increases by a factor of 4. What was the original speed of the particle?

A) 0.447c
B) 0.488c
C) 0.523c
D) 0.648c
E) 0.800c

Question 2

Two objects, A and B, are rubbed together. As a result, object A acquires an excess negative charge while object B becomes positively charged. In comparison to their masses before the charging process, you can say that

A) the mass of both objects increased.
B) the mass of A increased and that of B decreased.
C) the mass of A decreased and that of B increased.
D) the mass of both objects decreased.
E) None of the other choices is correct.