The amount that light of a distant galaxy is bent by the gravity of a nearby cluster of galaxies
A: allows us to measure the mass of the cluster.
B: proves that dark matter does not exist in clusters.
C: allows us to measure the mass of the galaxy.
Ans: A: allows us to measure the mass of the cluster.
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Within a given system, the internal forces
A. are always balanced by the external forces. B. all add to zero. C. are only determined by subtracting the external forces from the net force on the system. D. determine the motion of the system. E. are measured with a gravimeter.
When two identical waves arrive at the same place in phase, there is destructive interference
a. True b. False Indicate whether the statement is true or false
"Big Mike" throws a baseball straight up and it eventually falls back to him. When the ball was at its highest point, what was its velocity and what was its acceleration? (remember to include magnitude and direction)
What will be an ideal response?
An open organ pipe is tuned to a given frequency. A second pipe with both ends open resonates with twice this frequency. What is the ratio of the length of the first pipe to the second pipe?
A) 1 B) 2 C) 4 D) .5