A homeowner has a new oil furnace which has an efficiency of 60%. For every 100 barrels of oil needed to heat his house, how much (in barrels of oil) goes up the chimney as waste heat?
a. 20
b. 60
c. 40
d. 80
e. 10
c
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Latent Heats: A substance has a melting point of 20°C and a heat of fusion of 3.4 × 104 J/kg. The boiling point is 150°C and the heat of vaporization is 6.8 × 104 J/kg at a pressure of one atmosphere. The specific heats for the solid, liquid, and gaseous phases are 600 J/kg ? K (solid), 1000 J/kg ? K (liquid), and 400 J/kg ? K (gaseous). How much heat is required to raise the temperature of 1.90 kg of this substance from -4°C to 106°C at a pressure of one atmosphere?
A. 260 kJ B. 190 kJ C. 230 kJ D. 92 kJ E. 320 kJ
Magnetic Field of a Current Loop: A single current-carrying circular loop of radius R is placed next to a long, straight wire, as shown in the figure. The current I in the wire flows to the right. In which direction must current flow in the loop to produce a net magnetic field of zero at its center?
A. counterclockwise B. clockwise C. It could be either clockwise or counterclockwise. D. The current in the loop should be zero.
A particle with a positive charge sits at rest near the south pole of a magnet as shown below. What is the direction of the magnetic force on the particle? Choose from the answers provided to the right and below the diagram.
A.A
B.B
C.C
D.D
E. Toward the viewer
F. Away from the viewer
T. There is no magnetic force on the particle.
Because of the Coriolis force, a wind in the Northern Hemisphere is deflected
A) upward. B) downward. C) toward the right. D) toward the left.