Ten kilograms of water at 0°C is mixed with 10 kg of water at 100°C. What is the change in entropy (in cal/K) of the system?
a. 1000
b. 480
c. ?720
d. 240
e. ?168
d
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Which one has the largest range of possibilities [or quantum uncertainty range]?
A) proton B) electron C) dust grain D) helium atom E) water molecule
The location of the Galactic Center was first found by Harlow Shapley with
A) radio emissions from Sagittarius A. B) RR Lyrae variables in the globular clusters. C) Cepheids of population I in the spiral arms. D) infrared observations of the heat from its accretion disk around the black hole. E) planetary nebulae in the open clusters.
A point charge Q1 = +6.0 nC is at the point (0.30 m, 0.00 m); a charge Q2 = -1.0 nC is at (0.00 m, 0.10 m),
and a charge Q3 = +5.0 nC is at (0.00 m, 0.00 m). What are the magnitude and direction of the net force exerted on the +5.0-nC charge by the other two charges? (k = 1/4??0 = 9.0 × 109 N ? m2/C2 )
A crystal diffracts a beam of electrons, like a grating, as they hit it perpendicular to its surface
The crystal spacing is 0.18 nm, and the first maximum scattering occurs at 80° relative to the normal to the surface. (e = 1.60 × 10-19 C, melectron = 9.11 × 10-13 kg, h = 6.626 × 10-34 J ? s) (a) What is the wavelength of the electrons? (b) What potential difference accelerated the electrons if they started from rest?