Six pounds on Earth has what weight on the moon?
A) 1. kg
B) 6. lb
C) 36. lb
D) 1. lb
E) 1/6 lb
D
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Double-Slit Interference: In a two-slit experiment, the slit separation is 3.00 × 10-5 m. The interference pattern is created on a screen that is 2.00 m away from the slits. If the 7th bright fringe on the screen is 10.0 cm away from the central fringe, what is the wavelength of the light?
A. 100 nm B. 204 nm C. 214 nm D. 224 nm E. 234 nm
What do we mean when we say that the rotation curve for the Milky Way Galaxy is "flat"?
A) Gas clouds orbiting far from the galactic center have approximately the same orbital speed as gas clouds located further inward. B) The amount of light emitted by stars at different distances is about the same throughout the galaxy. C) The disk of a spiral galaxy is quite flat rather than spherical like the halo. D) All the galaxy's mass is concentrated in its flat, gaseous disk.
A bucket of cement is raised by a rope at constant speed at a construction site. Compared with the force of gravity on the bucket, the upward force supplied by the rope is
A) greater. B) equal. C) less.
Where is the center of mass of the Earth-Moon system?
a. Near the Moon. b. In Australia. c. Not very far above the surface of the Earth. d. Halfway between the Earth and the Moon. e. Under the surface of the Earth.