Which of the following reactions is the second reaction in the proton-proton chain?
A) 1H + 1H ? 2H + e+ + ?
B) 2H + 2H ? 4He + e+ + ?
C) 2H + 1H ? 3He + ?
D) 3He + 3He ? 4He + 1H + 1H
C
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What is the index of refraction inside a certain transparent material if the critical angle is found to be 48.° (air is outside)?
A) 1.49 B) 1.48 C) 1.35 D) 0.743 E) 1.22
If beam 1 is the incoming beam in the figure below, which of the other four beams are due to reflection?
Try to identify reasons that the population growth rate, both in the U.S. and worldwide, has declined in the last century rather than remaining constant
What will be an ideal response?
A 1200-kg ore cart is rolling at 10.8 m/s across a flat friction-free surface. A crane suddenly drops of ore vertically into the cart. How fast does the cart move just after being loaded with the ore?
A) 5.70 m/s B) 4.20 m/s C) 6.30 m/s D) 3.80 m/s