Modern evidence based on what can be determined about the products of nuclear reactions in the first few minutes after the big bang shows that dark matter:
A) does not have any density.
B) does not exist.
C) is not present in galaxies.
D) is not baryonic.
D
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In one way of naming stars, a(n) ____ letter indicates its brightness relative to the other stars in the constellation
a. English b. Arabic c. Greek d. Cyrillic
Relative Velocity: On a calm day with no wind, you can run a 1500-m race at a velocity of 4.0 m/s. If you run the same race on a day when you have a constant headwind that slows your speed by 2.0 m/s, how much time would it take you to finish the race?
A. 250 s B. 750 s C. 1125 s D. 9000 s
Rotational Kinetic Energy: A solid uniform ball with a mass of 125 g is rolling without slipping along the horizontal surface of a table with a speed of 4.5 m/s when it rolls off the edge and falls towards the floor, 1.1 m below. What is the rotational kinetic energy of the ball just before it hits the floor?
A. 0.51 J B. 0.73 J C. 1.1 J D. 2.6 J E. This question cannot be answered without knowing the radius of the ball.
The Early Bird communication satellite hovers over the same point on Earth's equator indefinitely, because
A) other forces than Earth's gravity act on it. B) it pulls as hard on Earth as Earth pulls on it. C) it is beyond the main pull of Earth gravity. D) it is kept aloft by ground control. E) its orbital period is 24 hours.