The quark structure of the proton is __________
Fill in the blank(s) with correct word
uud
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What did Carl Sagan mean when he said that we are all "star stuff"?
A) that life would be impossible without energy from the Sun B) that the Earth formed at the same time as the Sun C) that the carbon, oxygen, and other elements essential to life were created by fusion 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
A railroad train travels forward along a straight track at 90.0 m/s for 1 000 m and then travels at 70.0 m/s for the next 1 000 m. What is the average velocity?
a. 79.3 m/s b. 78.8 m/s c. 83.8 m/s d. 75.8 m/s e. 81.5 m/s
How many significant figures are there in the number 46.20?
a) 4 b) 3 c) 2 d) 5
A change in the direction of a wave when the wave finds an obstacle or an edge.
a) Refraction b) Standing wave c) Reflection d) Diffraction