Salt water is more dense than fresh water. A ship floats in both fresh water and salt water. Compared to the fresh water, the volume of salt water displaced by the ship is
A) greater than the volume of fresh water.
B) less than the volume of fresh water.
C) the same as the volume of fresh water.
B
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Two very long parallel wires carry currents in the positive x direction. One wire (current = 15 A) is coincident with the x axis. The other wire (current = 50 A) passes through the point (0, 4.0 mm, 0). What is the magnitude of the magnetic field at the point (0, 0, 3.0 mm)?
A. 3.8 mT B. 2.7 mT C. 2.9 mT D. 3.0 mT E. 0.6 mT
A coal-fired plant generates 600 MW of electric power. The plant uses 4.8 × 106 kg of coal each day. The heat of combustion of coal is 3.3 × 107 J/kg
The steam that drives the turbines is at a temperature of 300°C, and the exhaust water is at 37°C. (a) What is the overall efficiency of the plant for generating electric power? (b) What is the Carnot efficiency?
To save on electricity and eliminate heat in the kitchen, you would like to build a solar cooker. Which type of mirror would work best?
A. convex B. concave C. planar
When light passes through two or more narrow slits, an alternating dark and bright pattern is observed on a screen because of
a. interference. b. diffraction. c. specular reflection. d. diffuse reflection. e. polarization.