The choices describe four hypothetical planets. Which one's surface would you expect to be most crowded with impact craters? (Assume the planets orbit a star just like the Sun and that they are all the same age as the planets in our solar system.)
A) Size: same as the Moon
Distance from Sun: same as Mars
Rotation rate: once every 10 days
B) Size: twice as big as Earth
Distance from Sun: same as Mercury
Rotation rate: once every 6 months
C) Size: same as Mars
Distance from Sun: same as Earth
Rotation rate: once every 18 hours
D) Size: same as Venus
Distance from Sun: same as Mars
Rotation rate: once every 25 hours
A) Size: same as the Moon
Distance from Sun: same as Mars
Rotation rate: once every 10 days
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Exclusion Principle: The elements in the periodic table that have completely filled shells or subshells are referred to as
A. noble gases. B. halogens. C. alkali metals. D. transition elements.
A glance at the speedometer on your vehicle will tell you your
A) average speed. B) instantaneous speed. C) overall speed. D) acceleration.
An electric clothes dryer draws 10 A at 220 V. If the clothes put into the dryer have a mass of 10 kg when wet and 3 kg dry, about how long does it take to dry the clothes? (Assume all heat energy goes into vaporizing water, Lv = 2.26 × 10^6 J/kg)
a. 171 min b. 120 min c. 51 min d. 40 min e. 5 min
A cup that is 6.0 cm tall is in front of a concave lens. The image of the cup is 2.5 cm tall and 7.5 cm from the lens. What is the focal length of the lens?
A) -6.0 cm B) -7.5 cm C) -13 cm D) +18 cm E) +6.0 cm