Suppose there is a cloud containing interstellar dust between a star and us. How will the dust affect the light we see from the star?
A) It makes the star appear dimmer and redder in color.
B) It makes the star appear dimmer and bluer in color.
C) It does not affect the star's brightness but makes it appear redder in color.
D) It makes the star appear dimmer but does not affect the star's color.
A) It makes the star appear dimmer and redder in color.
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Why should galaxy collisions have been more common in the past than they are today?
A) Galaxies were closer together in the past because the universe was smaller. B) Galaxies attracted each other more strongly in the past because they were more massive; they had not yet turned most of their mass into stars. C) Galaxies were more active in the past and therefore would have collided with each other more frequently. D) Galaxies were much bigger in the past since they had not contracted completely.
The ____________________ of a black hole is the radius from the black hole at which the escape velocity is equal to the speed of light
Fill in the blank(s) with correct word
The type of energy that a swinging pendulum has at the low point of its swing is
A) elastic. B) kinetic. C) gravitational. D) thermal. E) sexual.
What is the mass of an object that experiences a gravitational force of 685 N near Earth's surface where g = 9.80 m/s2?
A) 69.9 kg B) 68.5 kg C) 71.3 kg D) 72.7 kg