Multiple Choice
Two spaceships are traveling past Earth at 90% of the speed of light in opposite directions (i.e., they are approaching each other) . One spaceship turns on a searchlight, which is seen by scientists aboard the other. What speed do the scientists measure for this light (c = speed of light in a vacuum) ?
A) 1.9 c (equal to c + 0.9 c)
B) 1.8 c (equal to 2 *0.9 c) .
C) c
D) 0.9 c
Correct Answer:
Verified
Correct Answer:
Verified
Q137: What is a primordial black hole?<br>A) black
Q138: What is the ergoregion of a Kerr
Q139: A space freighter accidentally drops a steel
Q140: A photon is emitted from the surface
Q141: How does a gravitational field affect the
Q143: The black hole at the center of
Q144: X-rays that come from the vicinity of
Q145: Which of these statements does NOT correctly
Q146: Which of these techniques has been successful
Q147: In what way is the general theory