Conservation of Momentum: Two ice skaters suddenly push off against one another starting from a stationary position. The 45-kg skater acquires a speed of 0.375 m/s relative to the ice. What speed does the 60-kg skater acquire relative to the ice?
A. 0.50 m/s
B. 0.28 m/s
C. 0.38 m/s
D. 0.75 m/s
E. 0.00 m/s
Answer: B
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What frequency must a photon have to raise an electron in a hydrogen atom from the n = 2 to the n = 4 state? (h = 6.626 × 10-34 J ? s, 1 eV = 1.60 × 10-19 J)
A) 3.06 × 1014 Hz B) 6.16 × 1014 Hz C) 4.11 × 1014 Hz D) 5.20 × 1014 Hz E) 9.24 × 1014 Hz
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A) isothermal expansion. B) isobaric expansion. C) adiabatic expansion. D) isometric process.
A cold, irregularly shaped region in the interstellar medium that diminishes or completelyobscures the light from background stars is called a//an:
a) irregular galaxy b) dark dust cloud c) emission nebula d) reflection nebula e) planetary nebula
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Fill in the blank(s) with the appropriate word(s).