Resistors in Combination: A number of resistors are connected across points A and B as shown in the figure. What is the equivalent resistance between points A and B?
A. 4 ?
B. 6 ?
C. 8 ?
D. 10 ?
E. 12 ?
Answer: C
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If Venus and Earth outgassed a similar amount of CO2 early in their histories, why are their surface temperatures so different today?
a. Venus didn’t contain any water, so couldn’t be dissolved and converted into sediments. Therefore, the runaway greenhouse effect made its surface much hotter. b. Venus was closer to the Sun, water tended to be in the atmosphere rather than in oceans, and couldn’t be dissolved. Therefore, the runaway greenhouse effect made the surface of Venus much hotter c. Venus’s moon fell onto the planet with a catastrophic impact, producing massive ejecta and increasing the abundance of in the atmosphere. Therefore, the greenhouse effect made its surface much hotter. d. Venus didn’t have a detectable magnetic field, so the solar wind reached Venus’s surface and evaporated additional from the crust, increasing the greenhouse effect and making its surface much hotter.
The distributed loading on beam ABCD is to be replaced by a statically equivalent set of forces. The mag- nitude and location of the statically equivalent force on beam segment AB are:
(A) 575 lb, 4.1 ft
(B) 638 lb, 4.2 ft
(C) 740 lb, 3.9 ft
(D) 428 lb, 4.4 ft
The greater the mass of a star, the ______________ it moves through its life cycle
Fill in the blank(s) with correct word
Give the formula, including the ionic charge, for each of the following polyatomic ions
a. hydroxide b. sulfate c. ammonium d. phosphate