To save energy while you leave your cool house for a half hour on a hot day, turn the temperature setting on the air conditioner
A) down.
B) up.
C) off altogether.
D) to room temperature.
Answer: C
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Power: If electricity costs 7.06¢/kW?h, how much would it cost you to run a 120-W stereo system 4.0 hours per day for 4.0 weeks?
A. $0.95 B. $0.14 C. $1.62 D. $2.66
A 25-kg television set rests on four rubber pads, each one having a height of 1.0 cm and a radius of 0.60 cm. A 200-N horizontal force is applied to the television set
How far does it move sideways due to the deformation of the rubber pads if the pads do not slide on the floor? The shear modulus of these rubber pads is 2.6 × 106 Pa. A) 6.8 mm B) 1.3 mm C) 3.4 mm D) 1.5 mm E) 1.7 mm
The direction of the force on an electric charge in a magnetic field is
a. in the direction of the magnetic field. b. in the direction of motion of the charge. c. perpendicular to the magnetic field. d. perpendicular to the direction of motion of the charge. e. none of the above.
Which best describes the property of surface tension in the examples pictured here?
a. Neighboring molecules of the liquid bond to each other, forming a flexible atomic sheet at the surface. b. Molecules at the surface have different properties than atoms surrounded on all sides by other atoms. c. At a surface, the interaction between air molecules and the fluid create the surface tension. d. The surface tension pulls molecules out from the center of a liquid to the surface. e. The surface tension only occurs at high temperatures.