A carnival Ferris wheel has a 15-m radius and completes five turns about its horizontal axis every minute. What is the acceleration of a passenger at his lowest point during the ride?
A. 5.7 m/s2 downward
B. 4.1 m/s2 upward
C. 14 m/s2 downward
D. 4.1 m/s2 downward
E. 19 m/s2 downward
Answer: B
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Which of the following processes slowed the collapse of protogalactic clouds?
A) the conversion of gravitational potential energy into kinetic and thermal energy as the cloud collapsed B) the formation of the first generation of stars C) the shock waves from the exploding supernovae of the earliest stars D) the pull of gravity of the mass of the cloud material E) the radiating away of thermal energy
How can close analysis of the spectra of quasars let us map the whole universe?
What will be an ideal response?
What was the approximate temperature of the universe at an age of 5 minutes?
A) about 300 K B) about 106 K C) about 109 K D) about 1012 K
) A light woman and a heavy man jump from an airplane at the same time and open their same-size parachutes at the same time. Which person will get to a state of zero acceleration first?
A) The light woman B) The heavy man C) Both should arrive at the same time. D) not enough information