Which of the following occurs during an El Niño year?
A) Fishing catches improve along the South American coast.
B) Cold water upwelling increases.
C) The Trade winds become stronger.
D) Storms increase on the western side of the Pacific.
Answer: D
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A +4.0-mC charge is placed on the x axis at x = +3.0 m, and a -2.0-mC charge is located on the y axis at y = -1.0 m. Point A is on the y axis at y = +4.0 m. Determine the electric potential at point A (relative to zero at the origin)
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A large spherical tank is filled with liquid nitrogen at -200ºC. Using an approximation that the elements of the sphere are infinite walls with initial temperature of 10ºC, when the surroundings are at 10ºC as shown, predict the temperature through the wall after 5 minutes using graphical techniques. The tank is 1% carbon steel, 2 cm thick, and the convective heat transfer coefficients are 40 W/m^2 K for air and 60 W/m^2 K for the nitrogen. Also determine the time before the outside wall reaches 5ºC.
