Which of the following is the smallest unit of heat energy?
A) Btu
B) calorie
C) kilocalorie
D) Joule
D
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The Sun traces a path along the ecliptic in a period that is longer than 365 days
a. True b. False Indicate whether the statement is true or false
The Oort Cloud is believed to have been formed by
A) planetesimals that were flung far from the Sun in gravitational encounters with the jovian planets. B) icy bodies formed between stars that have been captured by our solar system's gravity. C) moons that escaped from the jovian planets. D) debris from an icy planet that broke apart early in the solar system's history. E) debris from impacts of planetesimals, asteroids and comets with the jovian planets.
When the first law of thermodynamics, Q = ?u + W, is applied to an ideal gas that is taken through an isothermal process,
A) ?u = 0. B) W = 0. C) Q = 0. D) ?P = 0.
How many valence electrons does an atom of phosphorus have?
a. 15 b. 5 c. zero d. 3