A charge of 50-?C is placed on the y axis at y = 3.0 cm and a 77-?C charge is placed on the x axis at x = 4.0 cm. If both charges are held fixed, what is the magnitude of the initial acceleration of an electron released from rest at the origin?
a. 1.2 × 10^20 m/s2
b. 1.5 × 10^20 m/s2
c. 1.0 × 10^20 m/s2
d. 1.8 × 10^20 m/s2
e. 2.0 × 10^20 m/s2
a
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A 120-V circuit has a breaker rated at 10 amps. If a 1050-W toaster is operating on this circuit, what is the largest number of 100-W bulbs that may also operate simultaneously on this circuit without tripping the breaker?
1.0 2.1 3.2 4.more than 2
Consider the cosine of any angle between 35° and 40°. If the angle were doubled, what would happen to the cosine of the angle
a. It would halve. b. It would decrease to less than half its original value. c. It would decrease but be more than half its original value. d. In different cases, it could do any of the above.
Accretion is
a. the adding of material to an object an atom or molecule at a time. b. the adding of material to an object by collection of solid particles. c. the release of gas from rocks as they are heated. d. the largest of the Galilean satellites. e. caused by the bombardment of the solar wind.
Super-earths are
A) planets that are most earthlike, likely to harbor life. B) planets that are a few times the mass of the Earth. C) planets that have earthlike masses, but orbit much closer to their star than the Earth does to the Sun. D) any rocky (or terrestrial) planet. E) Earth-mass planets that are much lower in density than the Earth, giving them larger radii.