A pendulum of length L is suspended from the ceiling of an elevator. When the elevator is at rest the period of the pendulum is T. How does the period of the pendulum change when the elevator moves upward with constant velocity?
A) The period does not change.
B) The period increases.
C) The period decreases.
D) The period becomes zero.
E) The period increases if the upward acceleration is more than g/2 but decreases if the upward acceleration is less than g/2.
A
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When an unstable O nucleus undergoes beta decay, the nucleus formed is that of
a. Oxygen. b. Neon. c. Nitrogen. d. Carbon. e. Fluorine.
Light shines through atomic hydrogen gas that was initially in its ground state. You observe that after awhile much of the hydrogen gas has been excited to its n = 5 state
What wavelength of light entering the gas caused this excitation? (c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s, 1 eV = 1.60 × 10-19 J) A) 110 nm B) 91.4 nm C) 95.2 nm D) 2280 nm
Why is it important for a chemist to know the relative masses of atoms?
A) There are not that many different kinds of atoms and so it's important to know how they relate to one another. B) It provides information about how many atoms two samples have relative to each other. C) It provides an indication of how the different atoms will interact. D) Because the mass of an atom is directly related to its chemical properties.