Two spaceships approach Earth from opposite directions. One has a speed of 0.21c and the other a speed of 0.34c, both relative to Earth. What is the speed of one spaceship relative to the other?
A) 0.51c
B) 0.55c
C) 0.58c
D) 0.61c
E) 0.64c
Question 2
If the maximum voltage of an ac signal is 8.0 V, what is the rms value of this voltage?
A) 2.8 V
B) 5.7 V
C) 6.2 V
D) 4.0 V
E) 16.0 V