Graphical Addition: The sum of two vectors of fixed magnitudes has the greatest magnitude when the angle between these two vectors is
A. 90°.
B. 180°.
C. 60°.
D. 0°.
E. 270°.
Answer: D
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A guitar string is supposed to be played with a fundamental frequency of 880 Hz. If it is determined to have, instead, a fundamental frequency of 882 Hz, by what amount (as a percentage) must the tension in the string be changed in order that the fundamental frequency be restored to 880 Hz?
A. -0.45% B. +0.45% C. -0.11% D. -0.23%
The first evidence confirming the crystal structure of matter was
A) the citing of experiments by Nobel Prize-winning scientists. B) testimonials by crystal-loving investigators. C) X-ray diffraction patterns.
Two Styrofoam balls, of radii R and 2R, are released simultaneously from a tall tower. Which will reach the ground first?
A) The result will depend on the atmospheric pressure. B) the larger one C) Both will reach the ground simultaneously. D) the smaller one
Five moles of an ideal gas expands isothermally at 100°C to five times its initial volume. Find the heat flow into the system
a. 2.5 × 10^4 J b. 1.1 × 10^4 J c. 6.7 × 10^3 J d. 2.9 × 10^3 J e. 7.0 × 10^2 J