Two uniform rods, each of length 2.0 m, are bent to form semicircles. One rod has a charger per unit lent of 1.5 nC/m, and the other has a charge per unit length of –1.5 nC/m. The semicircles are joined to make a circle. What is the magnitude of the electric field at the center of the circle?
a. 42 N/C
b. 84 N/C
c. 34 N/C
d. 68 N/C
e. 0
B
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Isolated main-sequence stars as massive as 10 to 12 times the mass of the Sun may still manage to avoid going supernova. Why?
A) because they can also have strong stellar winds B) because about half that mass will be contained in the carbon core C) because they would be classified as brown dwarfs D) because these stars will eject at least 4 solar masses in the planetary nebula stage E) because their masses will decrease as they fuse heavy elements into lighter elements in their cores
The greater the frequency of the illuminating light on a photosensitive surface, the greater the
A) number of ejected electrons. B) velocity of ejected electrons. C) both of these D) neither of these
How much energy is in an 89.7 MHz photon of FM-radiation?
a. 2.2 × 10^-33 J b. 9.5 × 10^-27 J c. 7.4 × 10^-42 J d. 5.9 × 10^-26 J e. 3.7 × 10^-25 J
Uniform Circular Motion: An object moves in a circular path at a constant speed. Compare the direction of the object's velocity and acceleration vectors.
A. Both vectors point in the same direction. B. The vectors point in opposite directions. C. The vectors are perpendicular to each other. D. The acceleration is zero but the velocity is constant.