A conductor is distinguished from an insulator with the same number of atoms by the number of:
A) nearly free atoms
B) electrons
C) nearly free electrons
D) protons
E) molecules
Answer: C) nearly free electrons
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Friction: As shown in the figure, block B on a horizontal tabletop is attached by very light horizontal strings to two hanging blocks, A and C. The pulleys are ideal, and the coefficient of kinetic friction between block B and the tabletop is 0.100. The masses of the three blocks are mA = 12.0 kg, mB = 7.00 kg, and mC = 10.0 kg. Find the magnitude and direction of the acceleration of block B after the system is gently released and has begun to move.
What will be an ideal response?
Magnetic Field of a Current Loop: A current-carrying loop of wire lies flat on a horizontal tabletop. When viewed from above, the current moves around the loop in a counterclockwise sense. For points on the tabletop inside the loop, the magnetic field lines caused by this current
A. circle the loop in a clockwise direction. B. circle the loop in a counterclockwise direction. C. point straight up. D. point straight down.
The nebular theory predicts that the young Sun should have been rotating quite rapidly, but the Sun rotates slowly today. Can this fact be explained by the nebular theory?
A) Yes; the young Sun's solar wind would have carried away angular momentum, slowing the Sun's rotation. B) Yes, objects always slow their rotations over time. C) No, it is a complete mystery as to why the Sun would rotate slowly today.
___________ have elongated nuclei with spiral structure extending from the ends of the elongations. The Milky Way is a member of this class of galaxy
a. Spiral galaxies b. Barred spiral galaxies c. Elliptical galaxies d. Irregular galaxies e. S0 galaxies