The use of the term "sound waves" in air is meant to describe:
1.the position of air molecules.
2.the velocity of air molecules.
3.the pressure variations in air.
4.the displacement of air molecules.
5.the flow of energy through the air.
3
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Hydrogen Balmer lines are strongest near ____ spectral class whereas ionized Calcium (CaII) lines are strong in ___ stars
a. A0, K b. O5, M5 c. M5, G1 d. M0, B0
Nuclear Binding Energy: One of the fusion reactions that occurs in the sun is:
The following atomic masses are known:
What is the reaction energy released in this fusion reaction? (1 u = 931.5 MeV/c2)
A. 11 MeV B. 13 MeV C. 15 MeV D. 17 MeV E. 19 MeV
Answer the following questions for projectile motion on level ground assuming negligible air resistance (the initial angle being neither 0º nor 90º: (a) Is the acceleration ever zero? (b) Is the acceleration ever in the same direction as a component of velocity? (c) Is the acceleration ever opposite in direction to a component of velocity?
A. (a) No, (b) No, when the projectile is coming down, (c) No, on way up, because the acceleration is always downward throughout the satellite trip. B. (a) No, (b) Yes, when the projectile is coming down, (c) Yes, on way up, because the acceleration is always downward throughout the satellite trip. C. (a) Yes, (b) No, when the projectile is coming down, (c) Yes, on way up, because the acceleration is always downward throughout the satellite trip.
Mineral sample #5 is ________.
Fluorite - CaF2 Muscovite - KAl2(AlSi3O10)(F,OH)2 Gypsum - CaSO4·2H2O