The Bohr model of the hydrogen atom accounts for which quantum number?
a. orbital
c. orbital magnetic
b. principal
d. All of the above.
B
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Starting from rest at t = 0, a 5.0-kg block is pulled across a horizontal surface by a constant horizontal force having a magnitude of 12 N. If the coefficient of friction between the block and the surface is 0.20, at what rate is the 12-N force doing work at t = 5.0 s?
a. 0.13 kW b. 0.14 kW c. 0.12 kW d. 26 W e. 12 W
For a falling ball the action force is the pull of Earth on the ball. The reaction force is the
A) air resistance acting against the ball. B) acceleration of the ball. C) pull of the ball on Earth. D) nonexistent. E) none of the above
Why do Earth and Venus have active interiors, while Mercury and Mars do not?
A. Earth and Venus have rapid rotations, while Mercury and Mars do not. B. Earth and Venus are much more massive, and cool more slowly, than Mars and Mercury. C. Mercury and Mars have small iron cores, while Earth and Venus have large ones. D. All of these choices are correct. E. None of these choices is correct.
A voltage has been applied across a capacitor. If the dielectric is replaced with another dielectric constant eight times as great and the voltage is reduced to half of what it was, the ENERGY STORED in the capacitor is how many times the original
stored energy? A) 4 B) 1/4 C) 8 D) 1/2 E) 2