As a spaceship heads directly to Earth at a velocity of 0.8c, it sends a radio signal to Earth. When those radio waves arrive on Earth, their velocity relative to Earth is
A.
B.
C.
D.
, where vE is the velocity of the Earth.E.
, where vE is the velocity of the Earth.Answer: B
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Atmospheric pressure does NOT correspond to approximately
A) 0.1 MPa. B) 1.0 × 102 N/m2. C) 2.2 × 103 lb/ft2. D) 2.4 × 102 oz/in2. E) 15. lb/in2.
When you flip a switch to turn on a light, the delay before the light turns on is determined by:
a. the number of electron collisions per second in the wire. b. the drift speed of the electrons in the wire. c. the speed of the electric field moving in the wire. d. none of these, since the light comes on instantly.
Astronomers conclude that quasars must come from the earliest phases of the Universe because they ____
a. have supermassive black holes b. are colliding with other galaxies c. create jets d. have large redshifted spectra e. have a fluctuating luminosity
Earth's radius is 6.38 × 106 m, and it completes one revolution every day. What is the magnitude of the centripetal acceleration of a person standing on the equator?
A) 0.00844 m/s2 B) 0.00343 m/s2 C) 0.0337 m/s2 D) 0.343 m/s2 E) 0.000854 m/s2