As a spaceship is moving toward Earth, an Earthling measures its length to be 325 m,
while the captain on board radios that her spaceship's length is 1150 m. (c = 3.00 × 108 m/s)
(a) How fast is the rocket moving relative to Earth?
(b) What is the TOTAL energy of a 75.0-kg crewman as measured by (i) the captain in the rocket and (ii) the Earthling?
(a) 0.959c = 2.88 × 108 m/s
(b) (i) 6.75 × 1018 J (ii) 2.39 × 1019 J
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A spaceship moving past the Earth with a speed of 0.800 c signals to the Earth with pulsed laser photons emitted at 10.0-second intervals according to the spaceship's clock. According to observers on Earth who see the flashes, the time interval they measure is
a. 13.4 s b. 16.7 s c. 12.5 s d. 9.70 s e. 6.03 s
If R = 3.0 k?, C = 6.0 nF, ? 1 = 10.0 V, Q = 18 nC, ? 2 = 6.0 V, and I = 5.0 mA, what is the potential difference Vb ? Va?
a.
?13 V
b.
+28 V
c.
+13 V
d.
?28 V
e.
+2.0 V
How long does it take for a radio signal to travel to a spacecraft 
m away?
A. 5.0 s
B. 50 s
C. 
D. 
E. 
Newton's Second Law of Motion tells us that the net force applied to an object equals its
A) mass multiplied by acceleration. B) mass multiplied by energy. C) momentum multiplied by velocity. D) mass multiplied by velocity.