What is the difference between "center of gravity" (cg) and "center of mass" (cm)? When are they the same?
What will be an ideal response?
The cm is at the average position of the masses and does not depend upon gravity. The cg is the average position of weights with each mass being weighted by the strength of gravity g. The cm and the cg are identical when g is the same for all the masses.
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A certain ideal gas has a temperature 300 K and a pressure 5.0 × 104 Pa. The molecules have a mean free path of 4.0 × 10?7 m. If the temperature is raised to 350 K and the pressure is reduced to 1.0 × 104 Pa the mean free path is then:
A. 6.9 × 10?8 m B. 9.3 × 10?8 m C. 3.3 × 10?7 m D. 1.7 × 10?6 m E. 2.3 × 10?6 m
Compton Scattering: X-rays of energy 3.5 × 104 eV scatter through an angle of 105° off of a free electron. What is the energy (in eV) of the scattered x-rays? (melectron = 9.11 × 10-31 kg, c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s, 1 eV = 1.60 × 10-19 J)
Fill in the blank(s) with the appropriate word(s).
Which of the following provides evidence for the quantization of light?
A) Interference effects seen when light passes through a narrow opening B) The individual dots seen on a photographic plate when a photo is taken at extremely short exposure times C) Both of the above. D) Experiments that spread light out into a spectrum of colors E) All of the above.
In an isovolumetric process
a. the temperature remains constant. b. no heat is transferred between a system and its surroundings. c. the pressure remains constant. d. the volume remains constant. e. the internal energy is constant.