An 8.0-kg object moving 4.0 m/s in the positive x direction has a one-dimensional collision with a 2.0-kg object moving 3.0 m/s in the opposite direction. The final velocity of the 8.0-kg object is 2.0 m/s in the positive x direction. What is the total kinetic energy of the two-mass system after the collision?
a. 32 J
b. 52 J
c. 41 J
d. 25 J
e. 29 J
c
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Two 100 W bulbs differ in that one is designed for the American 120 V rms and the other is designed for the European 220 V rms. Which bulb has the greater resistance, and what is that resistance?
A. American, 288
B. American, 144
C. European, 484
D. European, 242 
E. they are the same, 265 
In stars, helium can sometimes be fused into carbon and heavier elements (in their final stages of life). Why didn't the same fusion processes produce carbon and heavier elements in the early universe?
A) By the time stable helium nuclei had formed, the temperature and density had already dropped too low for helium fusion to occur. B) Helium fusion occurred, but the carbon nuclei that were made were later destroyed by the intense radiation in the early universe. C) Temperatures in the early universe were never above the roughly 100 million Kelvin required for helium fusion. D) No one knows; this is one of the major mysteries in astronomy.
In a nuclear plant, 1017 J of energy is available from mass conversion. How much mass of fuel was lost to produce this energy? (c = 3.0 × 108 m/s)
A) 0.1 kg B) 1 kg C) 10 kg D) 100 kg
Enforce laws
What will be an ideal response?