A pendulum clock uses a simple pendulum as its timing device. The clock is correct at noon. The next day, when the clock reads noon, the actual time is 11:50 a.m
What is the fractional change in pendulum length that must be made so the clock runs at the correct rate?
A)
1.40% longer
B)
16.7% longer
C)
0.699% longer
D)
0.699% shorter
E)
2.84% longer
A
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Neptune may have more atmospheric activity than Uranus because it:
A) lacks an inclined magnetic field. B) contains 1.5 times less methane. C) has minimal cloud formations. D) has more heat flowing out of its interior.
A gas-filled vertical cylinder, closed at the bottom end, is fitted at the top with a piston that can move freely
The mass of the piston is 10.0 kg, and the initial height of the piston above the bottom of the cylinder is 25 cm. A mass of 8.0 kg is placed on the piston. What is the resulting height of the piston, assuming that the temperature of the ideal gas is kept constant? A) 12 cm B) 13 cm C) 14 cm D) 15 cm E) 16 cm
Energy Levels: A hydrogen atom is in its n = 2 excited state when its electron absorbs 9.5 eV in an interaction with a photon. What is the energy of the resulting free electron?
A. 6.1 eV B. 7.9 eV C. 8.2 eV D. 9.2 eV
Why do astronomers suspect there may be a ninth planet beyond Neptune?
A. The Kuiper Belt is not in the expected position. B. Pluto has more moons than it should. C. Several Trans-Neptunian Objects have elongated orbits yet are all currently closest to the Sun. D. Neptune's orbit extends closer to the Sun than expected.