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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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
The work done by the gas is zero during an
A) isothermal expansion. B) isobaric expansion. C) adiabatic expansion. D) isometric process.
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
Mechanical wave motion is a phenomenon in which there is a transport of ________ without net motion of the medium.
Fill in the blank(s) with the appropriate word(s).