Power: If the current flowing through a circuit of constant resistance is doubled, the power dissipated by that circuit will
A. quadruple in magnitude.
B. double in magnitude.
C. decrease to one-half of what it was.
D. decrease to one-fourth of what it was.
Answer: A
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A cluster containing a thousand or more galaxies, usually mostly ellipticals, scattered over a volume only a few Mpc in diameter is referred to as a(n) _____
A) elliptical galaxy cluster B) irregular galaxy cluster C) poor galaxy cluster D) rich galaxy cluster
A composite beam is made up of a 90 mm 5 160 mm wood beam (Ew 5 11 GPa) and a steel bottom cover plate (90 mm 3 8 mm, Es 5 190 GPa). Allowable stresses in wood and steel are 6.5 MPa and 110 MPa, respectively. The allowable bending moment about the z axis of the composite beam is most nearly:
(A) 2.9 kN?m
(B) 3.5 kN?m
(C) 4.3 kN?m
(D) 9.9 kN?m
Supernova 1987A was the first supernova observed by astronomers since Galileo first turned a telescope to the heavens
Indicate whether the statement is true or false
Increased reactant concentration usually leads to an increase in reaction rate, because collisions are
a. more violent only. b. more frequent only. c. both more violent and more frequent. d. none of these