Potential: A proton with a speed of 2.0 × 105 m/s accelerates through a potential difference and thereby increases its speed to 4.0 × 105 m/s. Through what magnitude potential difference did the proton accelerate? (e = 1.60 × 10-19 C , mproton = 1.67 × 10-27 kg)
A. 630 V
B. 210 V
C. 840 V
D. 1000 V
E. 100 V
Answer: A
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A) They formed beyond the frost line, where ices were three to four times more abundant than metals and rock. B) They are captured comets. C) They experienced many more cometary impacts during the Late Heavy Bombardment. D) They formed from hydrogen compounds expelled by the Jovian planets.
Wave Characteristics: How long does it take light to travel 1.0 m? (c = 3.0 × 108 m/s)
A. 3.3 ns B. 3.3 ?s C. 3.3 ms D. 3.3 s
Only high-energy gamma rays can escape the event horizon of a black hole
Indicate whether the statement is true or false
A circular window in the wall of a home has a diameter of 25 cm and is made of a single pane of glass 0.30 cm thick. Thermal conductivity for the glass is 0.63 W/mK. If 1.6 kJ is lost through the window in 12 s, and if inside the house the temperature is 
what is the outside temperature?
a. 
b. 
c. 
d. 
e. 