Two capacitors with capacitances of 1.5 mC and 0.25 mF, respectively, are connected in parallel. The system is connected to a 40-V battery. What charge accumulates on the 1.5-mF capacitor?
a. 100 mC
c. 60 mC
b. 75 mC
d. 33 mC
C
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Which of the following was NOT a contribution of Galileo to astronomy?
A) Sunspots showed the Sun was rotating on its axis, like the Earth does. B) The four moons of Jupiter are a model for the solar system motions in general. C) The phases of Venus prove it orbits completely around the Sun. D) The changing appearance of Saturn's rings corresponds to our seasons. E) The craters and mountains of the Moon prove it a world in its own right.
The wavelength of ultrasound at 1 million Hz in air where the speed of sound is 340 m/s is
a. 0.00000034 m. b. 0.0000034 m. c. 0.00034 m. d. 0.34 m. e. 340,000,000 m.
Knowing that the dot near the upper center of the Sun in this photo is the planet Venus, you can conclude that the photo was taken
A) during a transit. B) when Venus is at greatest western elongation. C) when Venus is at greatest eastern elongation. D) when Venus is at superior conjunction.
Which of the following transitions in hydrogen from an initial state (ni) to a final state (nf) results in the most energy emitted?
a. ni = 80, nf = 2 b. ni = 3, nf = 95 c. ni = 2, nf = 1 d. ni = 1, nf = 3