What is the hardness of diamond on the Mohs scale?
a. 1
b. 4
c. 7
d. 10
d
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Determine the rate of radiant heat emission in watts per square meter from a blackbody at (a) 150°C, (b) 600°C, (c) 5700°C.
GIVEN • A blackbody FIND The rate of radiant heat emission (qr) in W/m2 for a temperature of (a) T = 150°C = 423 K (b) T = 600°C = 873 K (c) T = 5700°C = 5973 K PROPERTIES AND CONSTANTS The Stefan-Boltzmann constant (?) = 5.67 ? 10–8 W/(m2 K4)
Refracting Telescope: A telescope has an angular magnification of 250 when used with a 20 mm eyepiece. What is the focal length of the objective lens?
A. 5.0 cm B. 25 m C. 5000 cm D. 5.0 m E. 2.5 m
Overall, what is our most accurate technique for measuring the distance to a nearby star?
A) radar ranging B) stellar parallax C) Hubble's law D) white dwarf supernovae
If a conductor is in electrostatic equilibrium near an electrical charge:
a. the total charge on the conductor must be zero. b. the electric field inside the conductor must be zero. c. any charges on the conductor must be uniformly distributed. d. the sum of all forces between the conductor and the charge must be zero.