Velocity Addition: A spaceship is moving away from an asteroid with a speed of 0.80c relative to the asteroid. The spaceship then fires a missile with a speed of 0.50c relative to the spaceship. What is the speed of the missile measured by astronauts on the asteroid if the missile is fired toward the asteroid?
A. 0.30c
B. 0.50c
C. 0.93c
D. 1.3c
E. 0.65c
Answer: B
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Suppose that Earth's ice caps melted, but everything else about the Earth's surface and atmosphere stayed the same. What would happen to Earth's average surface temperature?
A) The temperature would not be affected at all. B) The surface temperature would decrease. C) The surface temperature would increase. D) The surface temperature would change radically, until it was equal to the melting temperature of ice.
In latitudes where the subsurface layer of soil always remains frozen, the frozen layer is called
a. an aquifer. b. the frost table. c. a glacier. d. permafrost.
A proton and electron are separated by 3.5 nm
(a) What is the magnitude of the force on the electron? (b) What is the magnitude of the force on the proton? (c) What is the electric field of the proton at the electron position?