Ideal Gas Law: Originally 2.00 mol of gas are at STP. If the temperature changes to 47.0°C and the pressure decreases to half of what it was, how many liters do the two moles now occupy? (1 atm = 101 kPa, R = 8.31 J/mol ? K)
Fill in the blank(s) with the appropriate word(s).
105 L
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In what way does a 20 meter telescope outperform a 5 meter telescope?
A) The 20 meter can observe light with a wavelength 4 times longer than that of the 5 meter. B) The images of the 20 meter are 4 times brighter than those of a 5 meter. C) The images of the 20 meter are 1/8th as larger as those of the 5 meter. D) All objects observed by the 20 meter telescope will appear larger than those of the 5 meter. E) The images of the 20 meter are 16 times brighter than those of a 5 meter.
According to our present theory of solar system formation, why were solid planetesimals able to grow larger in the outer solar system than in the inner solar system?
A) because the Sun's gravity was stronger in the outer solar system, allowing more solid material to collect B) because only metal and rock could condense in the inner solar system, while ice also condensed in the outer solar system C) because gas in the outer solar system contained a larger proportion of rock, metal, and hydrogen compounds than the gas in the inner solar system D) because only the outer planets captured hydrogen and helium gas from the solar nebula
Patterns of stars in constellations hardly change in appearance over times of even a few thousand years. Why?
A) Stars are fixed and never move. B) Stars move, but they move very slowly—only a few kilometers in a thousand years. C) Although most stars move through the sky, the brightest stars do not, and these are the ones that trace the patterns we see in the constellations. D) The stars in our sky actually move rapidly relative to us—thousands of kilometers per hour—but are so far away that it takes a long time for this motion to make a noticeable change in the patterns in the sky. E) Stars within a constellation move together as a group, which tends to hide their actual motion and prevent the pattern from changing.
Parallel Wires: Two long parallel wires separated by 7.5 cm each carry 3.3 A in opposite directions. (?0 = 4? × 10-7 T ? m/A)(a) What magnetic force per length acts on each of the wires? Is it attractive or repulsive?(b) Find the magnitude of the magnetic field midway between the two wires.
What will be an ideal response?