What is the direction of 
at point P?
A. A
B. B
C. C
D. D
E. E
F. F
T. Zero
E. E
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Which of the following statements is true of the first reaction in the proton-proton chain?
A) It yields a helium atom. B) It emits a positron. C) It emits a gamma ray. D) It yields carbon dioxide.
A source emits sound at a fixed constant frequency f.If you run towards the source, the frequency you hear is
a. the same as f. b. higher than f. c. lower than f. d. unrelated to f.
In an inelastic collision between two objects with unequal masses:
a. the velocity of one will increase by the amount that the velocity of the other decreases. b. the momentum of one will increase by the amount that the momentum of the other decreases. c. the energy of one increases by the amount that the energy of the other decreases. d. the total momentum of the system will decrease.
An object is placed 10 cm in front of a mirror, and an image is formed that has a magnification of 2.5 . Which of the following statements is true?
a. This is the only true statement. b. The focal length of the mirror is 30 cm. c. The image is real. d. The image is inverted.