The cosmological redshifts of galaxies are Doppler shifts
a. True
b. False
Indicate whether the statement is true or false
False
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What is created by the fusion of three helium nuclei?
B) oxygen C) carbon D) nitrogen E) iron
To achieve a high equivalent resistance for a pair of resistors, connect them in
A) series. B) parallel. C) either of these
A block of ice sliding down an incline has one-quarter its maximum potential energy
A) one-quarter from the top. B) one-quarter from the bottom. C) three-quarters the way down. D) need more information
Uniform Circular Motion: A future use of space stations may be to provide hospitals for severely burned persons. It is very painful for a badly burned person on Earth to lie in bed. In a space station, the effect of gravity can be reduced or even eliminated. How long should each rotation take for a doughnut-shaped hospital of 200-m radius so that persons on the outer perimeter would experience 1/10 the normal gravity of Earth?
A. 91 min B. 8.7 min C. 4.6 min D. 1.5 min E. 0.011 min