In order to simulate apparent weightlessness for astronauts in training (when the astronauts do not push on a seat), they are flown in a vertical circle
If the passengers are to experience weightlessness, how fast should an airplane be moving at the top of a vertical circle with a radius of 2.5 km? A) 79 m/s
B) 310 m/s
C) 260 m/s
D) 160 m/s
E) 510 m/s
D
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Which characteristic is NOT shared by the Moon and Mercury?
a. heavily cratered surface b. negligible atmosphere c. rotations altered by tides d. dense metallic core e. geologically inactive
Why is Venus so much hotter than the Earth?
A) because it has much more carbon dioxide in its atmosphere B) because it rotates backwards compared to its orbital rotation C) because its clouds have a very high re?ectivity D) because it is closer to the Sun
On average, the Milky Way forms about ________ stars per year
Fill in the blank(s) with correct word
In a double-slit experiment, the slit separation is 2.0 mm, and two wavelengths, 750 nm and 900 nm, illuminate the slits simultaneously. A screen is placed 2.0 m from the slits
At what distance from the central maximum on the screen will a bright fringe from one pattern first coincide with a bright fringe from the other? A) 1.5 mm B) 3.0 mm C) 4.5 mm D) 6.0 mm E) 9.0 mm