Which of the following is not one of the most common nonsilicate groups of minerals?
a. Sulfides
b. Oxides
c. Chlorides
d. Carbonates
c
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Air at 20ºC moves over a horizontal roof at 20 cm/s. The roof is 40 m by 40 m and its temperature is 30ºC. Estimate the heat transfer by convection.
What will be an ideal response?
Lenz's Law: A bar magnet is oriented above a copper ring, as shown in the figure. If the magnet is kept fixed while the ring is dropped, what is the direction of the current induced in the ring, as viewed from below the ring?
A. There is no current in the ring. B. counterclockwise C. clockwise
If a solar eclipse occurs when the Moon is relatively far from Earth, so that its full shadow (umbra) does not reach Earth, then people directly behind the full shadow will experience
A) a penumbral eclipse. B) a total solar eclipse. C) a partial solar eclipse. D) an annular eclipse. E) no eclipse.
Neutron stars are 100,000 times denser than white dwarfs
Indicate whether the statement is true or false