Olbers' paradox is an apparently simple question, but its resolution suggests that the universe is finite in age. What is the question?
A) What would it be like to ride on a beam of light?
B) How many stars are in the universe?
C) Can we measure the position and momentum of an electron at the same time?
D) Why is the sky dark at night?
D
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All stars spend approximately the same amount of time on the main sequence
Indicate whether the statement is true or false
Based on DNA studies, it seems that all life on Earth
A) shares a common ancestor. B) belongs to one of just two kingdoms: plants and animals. C) arose from one of five distinct ancestors that lived about 2 billion years ago. D) requires oxygen to survive.
Viscosity: A fluid is flowing with an average speed of 1.5 m/s through a tube that has a radius of 2.0 mm and is 18 cm long. The drop in pressure is 967 Pa. What is the viscosity of the fluid?
A. 0.0018 N ? s/m2 B. 0.0056 N ? s/m2 C. 0.028 N ? s/m2 D. 0.013 N ? s/m2 E. 0.0034 N ? s/m2
Which of the following lists the stages of life for a low-mass star in the correct order?
A) protostar, main-sequence star, red giant, planetary nebula, white dwarf B) protostar, main-sequence star, red giant, supernova, neutron star C) protostar, main-sequence star, planetary nebula, red giant D) main-sequence star, white dwarf, red giant, planetary nebula, protostar