Two spaceships, each 100 m long in its own rest frame, approach Earth from opposite directions, each with a speed 0.50c relative to Earth. As measured by a passenger in one of the spaceships, how long is the other spaceship?
A) 50 m
B) 60 m
C) 70 m
D) 80 m
E) 90 m
B
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An RLC series circuit has a 400
resistance, a 2.5 mH inductor, and a capacitor. If the circuit is in resonance at 30 kHz, what is the capacitive reactance?
a. 
b. 
c. 
D. 71 
E. 0.00
An x-ray image is typically used to diagnose which of the following?
a. A muscle tear b. A broken bone c. Cardiac arrhythmia d. Low blood-oxygen levels
What is a standard candle?
A) an object for which we are likely to know the true luminosity B) an object for which we can easily measure the apparent brightness C) a class of objects in astronomy that all have exactly the same luminosity D) any star for which we know the exact apparent brightness E) a long, tapered candle that lights easily
Neptunium is an example of
a. A compound b. A solution c. An alloy d. An element