When a 100-kg astronaut ejects 0.1 kg of gas at a speed of 50 m/s from her propulsion pistol, her recoil speed is
A) 50 m/s.
B) 5.0 m/s.
C) 0.5 m/s.
D) 0.05 m/s.
Answer: D
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Plane polarized light of intensity 
is passed through two polarizers, the first one at 45 
more so that it is perpendicular to the original plane of polarization. What intensity is transmitted?
A. 0.50 
B. 0.35
C. 0.25
D. 0.13
E. 0
Astronomers use theory to determine the temperature of the Sun's core, because they cannot measure the core temperature directly.
Answer the following statement true (T) or false (F)
The primary source of the Sun's energy is:
A) oxidation of carbon in the core. B) gravitational collapse of the helium coreward. C) dark energy. D) the strong force fusing hydrogen into helium. E) the weak force creating energy from uranium decay.
Three identical resistors are connected in series to a battery. If the current of 12 A flows from the battery, how much current flows through any one of the resistors?
A) 12 A B) 36 A C) 4 A D) 24 A E) 6. A