How did Mr. Hubble calculate the age of the universe?
A) by measuring the rate of expansion of the universe
B) by looking at the age of the oldest stars
C) by measuring the redshift of stars within 360 degrees of the center of our galaxy
D) by measuring the rate of radioactive decay within the farthest galaxies
Answer: A
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The existence and location of ____________ was accurately predicted and located based on differences in the expected and observed orbit of another planet
Fill in the blank(s) with correct word
At equilibrium on a bathroom weighting scale, the downward pull of gravity on you is balanced by
A) your weight. B) an upward support force. C) your mass.
A motor converts
a. electricity into magnetism. b. electrical energy into mechanical energy. c. mechanical energy into electrical energy. d. force into power.
When the principal quantum number is n = 5, how many different values of m? are possible?
1.1 2.5 3.9 4.25