Hot sand cools off faster at night than plants and vegetation, which indicates that the specific heat capacity of sand is
A) less than for plants.
B) more than for plants.
C) likely the same as for plants.
D) not enough information
Answer: A
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Motional Emf: A conducting rod with a length ? = 25 cm is placed on a U-shaped metal wire that is connected to a lightbulb having a resistance of 8.0 ? as shown in the figure. The wire and the rod are in the plane of the page. A constant uniform magnetic field of strength 0.40 T is applied perpendicular to and into the paper. An external applied force moves the rod to the right with a constant speed of 6.0 m/s. What are the magnitude and direction of the induced current in the circuit?
A. 17 mA clockwise B. 17 mA counterclockwise C. 75 mA counterclockwise D. 75 mA clockwise E. 52 mA clockwise
Polaroid sunglasses help when skiing on snow on a sunny day by reducing the sunlight from the snow. This light from the snow has been polarized by:
a. selective absorption. b. reflection. c. double refraction. d. scattering.
Thin film interference is responsible for the colors of
a. bird feathers. b. gasoline spills. c. soap bubbles. d. all of the above.
What is the minimum frequency with which a 300-turn, flat coil of cross sectional area 370 cm2 can be rotated in a uniform 25-mT magnetic field if the maximum value of the induced emf is to equal 8.6 V?
a. 0.20 Hz b. 2.2 Hz c. 4.9 Hz d. 31 Hz e. 0.031 Hz