Consider a situation where a skater pulls her arms inward, causing her rotation rate to speed up. Angular momentum is conserved
Indicate whether the statement is true or false
T
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Distance divided by time
A. Gerard de Vaucouleurs |
B. Georges Lemaître |
C. Hubble’s Law |
D. Edwin Hubble |
E. Velocity or Speed |
F. Ho |
A pure sample of 226Ra contains 2.0 × 10^14 atoms of the isotope. If the half-life of 226Ra = 1.6 × 10^3 years, what is the decay rate of this sample? (1 Ci = 3.7 × 10^10 decays/s)
Sea level fluctuated several times during the Paleozoic. Which of the following is not a representative factor for sea level rise in the Paleozoic?
A) Melting of continental glaciers. B) Ocean basins stood high on the asthenosphere due to active seafloor spreading. C) Ocean basins stood high on the asthenosphere due to slow but continuous seafloor convergence. D) The breakup of the Precambrian supercontinent.
An old 78 rpm record rotates through an angle of 320° as it slows down uniformly from 78.0 rpm to 22.8 rpm. What is the magnitude of the angular acceleration of the record?
A) 2.34 rad/s2 B) 5.46 rad/s2 C) 6.50 rad/s2 D) 8.35 rad/s2 E) 10.9 rad/s2