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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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
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
Flares and prominences are more numerous during ________
Fill in the blank(s) with correct word
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