Is there a force on the moon, and how do you know?
A) No, because the moon moves at an unchanging speed.
B) No, because the moon is not accelerated.
C) Yes, because there must be a force to keep the moon moving.
D) Yes, because the moon is accelerated.
E) Yes, because there must be a force pulling outward on the moon, away from Earth, to keep the moon from falling down to Earth.
D
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Shown following are six different types of light that travel to Earth from sources in space. Rank these types of light from left to right based on the altitude in the atmosphere where they are completely absorbed, from highest to lowest (Earth’s surface). If two (or more) of the choices reach the same altitude or the surface, rank them as equal by dragging one on top of the other(s).
The Bohr model pictures a hydrogen atom in its ground state as a proton and an electron separated by the distance a0 = 0.529 × 10^?10 m. The electric potential created by the proton at the position of the electron is
a. ?13.6 V. b. +13.6 V. c. ?27.2 V. d. +27.2 V. e. +5.12 × 10^9 V.
What is the highest order maximum that is possible when using a grating with 600 slits per mm for a wavelength of 700 nm?
A. 1 B. 2 C. 3 D. 4 E. 5