Ordinary matter in the form stars and planet makes up approximately what proportion of the total mass and energy in the universe?
A) about 70 percent
B) a few percent
C) about 25 percent
D) nearly a 100 percent
B
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The celestial equator is
a. a line around the sky directly above Earth's equator. b. the dividing line between the north and south celestial hemispheres. c. the path that the sun appears to follow on the celestial sphere as Earth orbits the sun. d. a and b. e. a and c.
Websites typically only have one goal.
Answer the following statement true (T) or false (F)
What do astronomers mean when they say that we are all "star stuff"?
A) that life would be impossible without energy from the Sun B) that Earth formed at the same time as the Sun C) that the carbon, oxygen, and many elements essential to life were created by nucleosynthesis in stellar cores D) that the Sun formed from the interstellar medium: the "stuff" between the stars E) that the Universe contains billions of stars
Waves travel along a 100-m length of string which has a mass of 55 g and is held taut with a tension of 75 N. What is the speed of the waves?
A) 3700 m/s B) 370 m/s C) 37 m/s D) 0.37 m/s E) 3.7 m/s