It is an advantage for an automobile engine to run at a high temperature because
A. it allows the use of lighter engine components made from aluminum.
B. a high operating temperature cools off the fuel before ignition.
C. its efficiency is higher, since the temperature difference is what dictates efficiency.
D. gasoline only ignites under high temperature conditions.
Answer: C
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Stable equilibrium is:
a. an equilibrium state where any small rotation results in a torque that acts to produce rotation back in the opposite direction. b. any form of equilibrium, because all equilibrium conditions are stable. c. an equilibrium state where nothing is moving. d. an equilibrium state where there is no net torque or net force. e. an equilibrium state where no torque is involved.
How many electrons are there in the third shell of sodium, Na (atomic number 11)?
A) none B) one C) two D) three
In a situation where an object can move only along the x axis, you see this statement in a book: “The object’s velocity is v = (x ? x0) / t, where x is the object’s position at time t to the left or right of its position x0 at time t = 0.” Is being used here as a shorthand for 
(A) or vx (C)?
A. A B. C
Which of the following best describes the modern definition of a constellation
a) a group of stars that all lie at about the same distance from Earth b)a region of the celestial sphere c)a pattern of bright stars in the sky