Can friction ever do positive work?
a. Yes
b. No
Ans: a. Yes
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Equilibrium: A 6.00-kg ornament is held at rest by two light wires that form 30° angles with the vertical, as shown in the figure. An external force of magnitude F acts vertically downward on the ornament. The tension exerted by each of the two wires is denoted by T. A free-body diagram, showing the four forces that act on the box, is shown in the figure. If the magnitude of force F is 410 N, what is the magnitude of the tension T?
A. 271 N B. 235 N C. 188 N D. 376 N E. 470 N
Determine the molar analysis of standard air (79% N2, 20% O2, and 1% argon, by volume) with 100 ppm of radon gas at 101 kPa, 20ºC.
What will be an ideal response?
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
The Great Smokies got their name because natural VOCs created haze. Does this mean we do not need to be concerned about the effects of air pollution in the Park?
What will be an ideal response?