Most galaxies are isolated in space
Indicate whether the statement is true or false
FALSE
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Double-lobed radio galaxies are an effect of black hole jets
a. True b. False Indicate whether the statement is true or false
According to the universal law of gravitation, if the masses of both attracting objects double, then the gravitational force between them will
A) not change at all. B) increase by a factor of 2. C) decrease by a factor of 2. D) increase by a factor of 4. E) decrease by a factor of 4.
Three flat layers of transparent material are stacked upon one another. The top layer has index of refraction n1, the middle has n2 and the bottom one has n3 . If n1 < n2 < n3, at what angle of incidence will a ray of light traverse the three layers in a single straight line?
a. ?i = sin–1(1/n1) b. ?i = sin–1(1/(n1+n2+n3) c. ?i = tan–1(1/(n1+n2+n3) d. There is such an angle, but it is not given.
Kaitlin uses a bat to hit a thrown baseball. She knocks the ball back in the direction from which it came in an inelastic collision. The bat, which is heavier than the baseball, continues to move in the same direction after the hit as Kaitlin "follows through.". Is the ball moving faster before or after it was hit?
a. The ball was moving faster before it was hit. b. The ball was moving faster after it was hit. c. The ball was moving at essentially the same speed before and after the hit. d. There is insufficient information to answer this problem.