This diagram represents a person's local sky. What does the red semicircle represent?
A) the horizon
B) the meridian
C) the zenith
D) the celestial equator
B) the meridian
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Motional Emf: A conducting rod whose length is ? = 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 out of the paper. An external applied force moves the rod to the left with a constant speed of 12 m/s. What are the magnitude and direction of the induced current in the circuit?
A. 150 mA clockwise B. 150 mA counterclockwise C. 34 mA counterclockwise D. 34 mA clockwise E. 100 mA clockwise
An electric clothes dryer draws 20 A at 220 V. If the clothes put into the dryer have a mass of 7.0 kg when wet and 3.0 kg dry, how long does it take to dry the clothes? (Assume all heat energy goes into vaporizing water, Lv = 2.26 × 10^6 J/kg.)
a. 55 min c. 16 min b. 26 min d. 34 min
A car accelerates from to at a rate of How far does the car travel while accelerating?
A) 80.0 m B) 133 m C) 226 m D) 399 m
Two blocks with mass m2 > m1 are pulled as shown along horizontal surfaces, each at a constant speed v. Which tension force does more work moving the block a distance D along the surface?