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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what is the outside temperature?
a. 
b. 
c. 
d. 
e. 
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
The large Jovian satellites have sizes comparable to Mercury. Why do they have an icy composition compared to Mercury's rocky composition?
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.
Only high-energy gamma rays can escape the event horizon of a black hole
Indicate whether the statement is true or false