A piston compresses a gas, while at the same time heat is lost to the surroundings. The temperature of the gas rises. This is governed by the second law of thermodynamics
a. True
b. False
Indicate whether the statement is true or false
False
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Calculate the concentration of vacancies in silicon at the solid-liquid equilibrium temperature of 1683 K where single crystals of silicon are grown. The enthalpy of formation for vacancies in silicon is 2.3 eV/vacancy.
What will be an ideal response?
Estimate the following:
(a) The change in your gravitational potential energy on taking an elevator from the ground floor to the top of the Empire State Building. The building is 102 stories high (assuming a 3 min ride to the top of the building). (Assuming your mass is 68 kg and the height of one story to be 3.5 m.) (b) The average force exerted by the elevator on you during the trip. (c) The average power delivered by that force.
Sulfur has an atomic number of 16. What would be the valence number of this element?
A. One B. Two C. Three D. Four E. Six
What does the equivalence principle say?
A) Gravity is the same thing as curvature of spacetime. B) The effects of gravity are exactly equivalent to the effects of acceleration. C) You cannot distinguish between motion at constant velocity and weight in a gravitational field. D) The effects of relativity are exactly equivalent to those predicted by Newton's laws of motion. E) All observers must always measure the same (equivalent) weights for moving objects.