Which of the following statements about the Milky Way Galaxy is not true?
A) One rotation of the galaxy takes about 200 million years.
B) Our solar system is located very close to the center of the Milky Way Galaxy.
C) The galaxy is about 100,000 light-years in diameter.
D) It contains between 100 billion and 1 trillion stars.
B
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Which model of the universe gives the youngest age for the present size of the universe? (Assume that the present expansion rate is the same for all of these models. The different models have different expansion histories.)
A) a recollapsing universe B) a coasting universe C) a critical universe D) an accelerating universe E) All models give the same age.
The position of a cart that is oscillating on a spring is given by the equation
x = (12.3 cm) cos[(1.26 s-1)t]. When t = 0.805 s, what are the (a) velocity and (b) acceleration of the cart?
Carbon-14 has a half-life of 5730 years. You discover a single carbon-14 nucleus in your laboratory. What is the probability that it will decay in the next 24 hours?
A. 4.9 x 10-7 B. 3.3 x 10-7 C. 4.8 x 10-7 D. It cannot be known unless the age of the nucleus is known.
A car enters a level, unbanked semi-circular hairpin turn of 100-m radius at a speed of 28 m/s. The coefficient of friction between the tires and the road is ? = 0.800 . If the car maintains a constant speed of 28 m/s, it will
a. attempt to dig into the road surface. b. tend to veer toward the center of the semicircle. c. arrive safely at the end of the semicircle. d. tend to veer toward the outside of the circle. e. veer toward the center for the first quarter-circle, then veer toward the outside for the second quarter-circle.