A uniform rod is 2.0 m long. The rod is pivoted about a horizontal, frictionless pin through one end. The rod is released from rest at an angle of 30° above the horizontal. What is the angular acceleration of the rod at the instant it is released?
a. 4.7 rad/s2
b. 6.9 rad/s2
c. 6.4 rad/s2
d. 5.6 rad/s2
e. 4.2 rad/s2
C
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Remember Kepler's third law, which relates the period of revolution to the average distance to a planet. How do we modify that law to use with binary stars? a. Add the total mass of the two stars
b. Add Newton's Law of Gravitation. c. Add Einstein's Law of Relativity. d. Add the difference of their masses. e. Add the distance between the two stars.
Which hypothesis suggested that the Moon formed elsewhere and was later caught by Earth's gravity?
a. fission hypothesis b. fusion hypothesis c. large-impact hypothesis d. capture hypothesis e. condensation hypothesis
What would happen to the core of the Sun if its temperature rose slightly?
A) The rate at which fusion occurs would decrease, leading to a contraction of the core, which would in turn cause the temperature to rise even further. B) The rate at which fusion occurs would increase, leading to a contraction of the core, which would in turn cause the temperature to rise even further. C) The rate at which fusion occurs would increase, leading to an expansion of the core, which would in turn cause the temperature to drop back down. D) The rate at which fusion occurs would decrease, leading to an expansion of the core, which would in turn cause the temperature to drop back down.
Nearly all life on Earth passes on its heredity using
A) lipids B) RNA C) DNA D) proteins