Tests using a thermal probe in a laboratory setting to determine the thermal conductivity of a granular material, earth, as shown in the figure are limited by the diameter of the container. Estimate the minimum diameter of the container of sample, D, for a test run for 3 minutes. Assume the thermal diffusivity is 5 x 10^-6m^2/s.
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Inelastic Collisions: A 2.0-kg mass moving at 5.0 m/s suddenly collides head-on with a 3.0-kg mass at rest. If the collision is perfectly inelastic, what is the speed of the masses just after the collision?
A. 10 m/s B. 2.5 m/s C. 2.0 m/s D. 0 m/s, since the collision is inelastic
Heat is applied to an ice-water mixture to melt some of the ice. In this process
a. work is done by the ice-water mixture. b. the temperature increases. c. the internal energy increases. d. all of the above are correct.
When a switch is closed, completing an LR series circuit, the time needed for the current to reach three-quarters its maximum value is ____ time constants
a. 0.500 b. 0.693 c. 0.725 d. 1.33 e. 1.39
Sundogs and halos of the Sun and the Moon are caused by:
a. refraction by the atmosphere. b. refraction by water droplets. c. reflection of the object in water. d. scattering by molecules in the air. e. refraction by atmospheric ice crystals.