Three resistors, 80 ?, 10 ?, and 70 ?, are wired in parallel and connected to a 120-V battery. How much current flows in this circuit?
a. 0.75 ?
b. 15 ?
c. 950 ?
d. 0.0021 ?
b
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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
A 6.5-g iron meteor hits Earth at a speed of 295 m/s. If its kinetic energy is entirely converted to the thermal energy of the meteor, by how much will its temperature rise? The specific heat of iron is 113 cal/kg ? C°, and 1 cal = 4.186 J
A) 92.0 C° B) 57,100 C° C) 0.147 C° D) 384 C°
Standard time zones
a)contain 30° of latitude. b)contain 15° of longitude. c)are 12 in total number. d)are 7.5° wide.
In a chiller unit, ammonia is to be condensed at a saturation temperature of 50ºC by passing the ammonia vapor over vertical plates 100 cm high by 150 cm wide and at a surface temperature of 20ºC. Estimate the average convective heat transfer coefficient and the amount of ammonia condensing from one plate surface. Use a value of 1052.8 kJ/kg for hnfg for ammonia.
What will be an ideal response?