A merry-go-round spins freely when Diego moves quickly to the center along a radius of the merry-go-round. As he does this, it is true to say that
A) the moment of inertia of the system decreases and the angular speed remains the same.
B) the moment of inertia of the system decreases and the angular speed decreases.
C) the moment of inertia of the system decreases and the angular speed increases.
D) the moment of inertia of the system increases and the angular speed increases.
E) the moment of inertia of the system increases and the angular speed decreases.
C
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What did Le Verrier and Adams do differently than Herschel when they discovered Neptune?
a. found the planet by scanning thousands of photographic plates b. found the planet by accident by simply searching the sky c. applied the basic laws of physics to discover Neptune's position d. applied a newly modified telescope to find the position of Neptune e. witnessed the parallax of Neptune and calculated its position
General Questions: An elevator suspended by a vertical cable is moving downward but slowing down. The tension in the cable must be
A. greater than the weight of the elevator. B. less than than the weight of the elevator. C. equal to the weight of the elevator.
Moving electric charges make magnetic fields
a. True b. False Indicate whether the statement is true or false
What was Tycho Brahe's contribution to astronomy? a. He proved that Earth rotates on its own axis and revolves around the Sun
b. He designed the three laws of planetary motion. c. He discovered satellites around Jupiter, which proved Earth could move and keep its satellite. d. He described why each of the planets moved in uniform circular motion. e. He compiled detailed observations of the positions of the Sun, Moon, and planets over a period of 20 years.