_____ is a constant in Einstein's equations of space and time that represents a force of repulsion
A) Planck's constant
B) Cosmological constant
C) Archimedes' constant
D) Hubble's constant
B
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A steel billet is to be heat treated by immersion in a molten salt bath. The billet is 5-cm-square and 1-m-long. Prior to immersion in the bath, the billet is at a uniform temperature of 20°C. The bath is at 600°C and the heat transfer coefficient at the billet surface is 20 W/(m2K). Plot the temperature at the center of the billet as a function of time. How much time is needed to heat the billet center to 500°C? Use an implicit difference scheme with node spacing of 1 cm. The thermal conductivity of the steel is 40 W/(m K) and the thermal diffusivity is 1 x 10–5 m2/s.
GIVEN Steel billet undergoing heat treatment FIND (a) Temperature at the center of the billet as a function of time (b) How much time is needed to heat the center of the billet to 500°C
The mechanical equivalent of heat was first determined by
A) Lord Kelvin. B) James Joule. C) Stefan and Boltzmann. D) Count Rumford. E) Con Edison.
Briefly describe the phenomena of the sunspot cycle
What will be an ideal response?
The fact that the Voyager spacecraft continues to travel out of the solar system, even though its rockets have no fuel, is an example of
A) Newton's first law of motion. B) Newton's second law of motion. C) Newton's third law of motion. D) the universal law of gravitation. E) none of the above.