Supernova remnants differ from star forming regions because, although there is ionized hydrogen in both, supernova remnants
A) don't look like star forming regions.
B) are much bigger than star forming regions.
C) are located far from star forming regions.
D) are more diffuse than star forming regions.
E) contain no ionizing stars.
E
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Vegetable oil is boiled by passing steam at 215ºF through a 1-inch ID by 1.25-inch OD steel tube. Predict the overall heat transfer coefficient based on the outside area of the tube if the convective heat transfer coefficients are 25 Btu/hr?ft^2?ºF for steam and 15 Btu/hr?ft^2 ?ºF for the vegetable oil. Neglect fouling factors.
What will be an ideal response?
Two vertical tubes of equal cross-sectional areas are filled with liquids to heights producing atmospheric pressure at their bottoms. One liquid is water and the other is mercury. Both liquids have equal
A) volumes. B) densities. C) weights. D) viscosity. E) none of the above
We cannot see a new moon in our sky because
A) it is obscured by Earth's shadow. B) no sunlight is illuminating the Moon. C) a new moon is quite near the Sun in the sky. D) it is above the horizon during the daytime.
Pennies used to be made of copper, but now they are made of copper-coated zinc. If one were to do a precise calorimetry experiment to determine the specific heat of the new pennies, what would the result be?
a. It would be that of copper since copper is on the outside. b. It would be that of zinc since zinc is in the center. c. It would be the sum of the copper and zinc specific heats. d. It would be between that of copper and that of zinc, depending on coating thickness.