If the atmosphere were about 40 times thicker, at noon the Sun would appear
A) red-orange.
B) orange-green.
C) green-blue.
D) blue-violet.
E) none of the above
Answer: A
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An unusual lightning strike has a vertical portion with a current of ?400 A downwards. The Earth's magnetic field at that location is parallel to the ground and has a magnitude of 30 ?T. In N, the force exerted by the Earth's magnetic field on the 25 m-long current is
a. 0. b. 0.012 N, East. c. 0.012 N, West. d. 0.30 N, West. e. 300 N, East.
The change in shape due to transport of atoms through the bulk of the material is called _________ creep.
Fill in the blank(s) with the appropriate word(s).
White light is spread out into spectral hues by a diffraction grating. If the grating has 1000 lines per cm, at what angle will red light (? = 640 nm) appear in first order?
a. 14.7° b. 7.35° c. 17.7° d. 3.67° e. 1.84°
The horizontal component of the velocity of a projectile remains constant during the entire trajectory of the projectile
Indicate whether the statement is true or false