Explain the advantages and disadvantages of "superinsulated" homes
What will be an ideal response?
The advantages include increased comfort level because the home is less drafty
and reduced energy cost because of greater insulation. Disadvantages include possibilities
for mold growth in wetter rooms, buildup of pollutants from ordinary living such as
cooking, etc.
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Most of Earth's freshwater supply is now in the
form of a) oceans. b) rivers and lakes. c) groundwater. d) glacial ice.
A 1.10-kg wrench is acting on a nut trying to turn it. The length of the wrench lies directly to the east of the nut. A force 150.0 N acts on the wrench at a position 15.0 cm from the center of the nut in a direction 30.0° north of east
What is the magnitude of the torque about the center of the nut? A) 22.5 N?m B) 11.3 N?m C) 19.5 N?m D) 2250 N?m E) 1949 N?m
A point charge Q is placed on the x axis at x = 2.0 m. A second point charge, ?Q, is placed at x = 3.0 m. If Q = 40 ?C, what is the magnitude of the electrostatic force on a 30-?C charge placed at the origin?
A. 7.2 N B. 3.9 N C. 1.5 N D. 14 N E. 8.1 N
The Sun's radius is one astronomical unit by definition
Indicate whether the statement is true or false