The owner of a cabin that is located on a small stream is thinking of placing a dam across the stream to create a possible drop of 120 cm. The stream is measured to have approximate dimensions of 180 cm by 10 cm and a leaf on the water’s surface is observed to travel 10 m in 8 s. If an 80% efficient turbine is used, how much power can the owner expect to generate?
(A) 1 kW
(B) 2 kW
(C) 3 kW
(D) 4 kW
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Flares and prominences are more numerous during ________
Fill in the blank(s) with correct word
The magnetic field due to the current in a long, straight wire is 8.0 ?T at a distance of 4.0 cm from the center of the wire. What is the current in the wire?
A) 0.20 A B) 0.40 A C) 0.80 A D) 3.2 A E) 1.6 A
At what distance from a long straight wire carrying a current of 5.0 A is the magnitude of the magnetic field due to the wire equal to the strength of Earth's magnetic field of about 5.0 × 10-5 T? (?0 = 4? × 10-7 T ? m/
A) A) 1.0 mm B) 1.0 cm C) 2.0 cm D) 3.0 cm E) 4.0 cm
At solar noon on the winter solstice, the Sun is located ________.
A. 23.5 degrees above the ecliptic B. 23.5 degrees above the Celestial Equator C. 23.5 degrees below the ecliptic D. 23.5 degrees above the horizon E. 23.5 degrees below the Celestial Equator