For an ohmic conductor, current is
a. directly proportional to voltage.
b. directly proportional to resistance.
c. independent of resistance.
d. independent of voltage.
a
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Determine Qnet for the toasting bread in problem 7.9, if the surroundings act as a gray surface with emissivity of 0.45 and temperature of 85ºC.
A terrestrial world's lithosphere is
A) a thin layer of rock that lies between the mantle and crust. B) the interior region in which the planet's magnetic field is generated. C) a layer of hot, molten rock encompassing the core and part of the mantle. D) a layer of relatively strong, rigid rock, encompassing the crust and part of the mantle.
A boy throws a rock with an initial velocity of 2.15 m/s at 30.0° above the horizontal. If air resistance is negligible, how long does it take for the rock to reach the maximum height of its trajectory?
A) 0.110 s B) 0.194 s C) 0.215 s D) 0.303 s
What is the magnitude of the magnetic field at point P if a = R and b = 2R?
a.
