It there were no gravity a stone thrown upward at 45 degrees would follow a straight-line path. But because of gravity, at the end of 1 second, the stone is actually
A) 5 m below the straight line.
B) 10 m below the straight line.
C) 15 m below the straight line.
Answer: A
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Thin Films: When a beam of light, originally traveling in air, enters a piece of glass having an index of refraction of 3/2, its wavelength
A. increases by a factor of 3/2. B. is reduced to 2/3 its original value. C. is unaffected.
Assume that D and R have units of meters, T has units of seconds, m and M have units of kilograms, has units of meters per second, and has units of m/s2. Which of the following equations has self-consistent units?
A. D = mR2
B. m = M[1 + R2]
C. D = [1 – m/M]gT2
D. 
= mv2/R
E. D = 
2/RT
F. None of these can be correct.
A mass which weighs 19.6 Newtons on Earth is 2.3 meters away from a 2.00 kg mass
(a) Determine their mutual gravitational attraction to each other. (b) How much work would have to be done to put a very large distance between the two masses?
How much energy would be released if 2.0 kg of material was lost during a reaction? (c = 3.0 × 108 m/s)
A) 4.7 × 10-8 J B) 1.5 × 1016 J C) 6.0 × 108 J D) 1.8 × 1017 J