Gravitational Force: A spaceship is traveling to the Moon. At what point is it beyond the pull of Earth's gravity?
A. when it gets above the atmosphere
B. when it is half-way there
C. when it is closer to the Moon than it is to Earth
D. It is never beyond the pull of Earth's gravity.
Answer: D
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A 3.0-mF capacitor charged to 40 V and a 5.0-mF capacitor charged to 18 V are connected to each other, with the positive plate of each connected to the negative plate of the other. What is the final charge on the 3.0-mF capacitor?
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An ac generator consisting of a coil with N turns rotating at angular speed ? in an external magnetic field B produces a maximum emf ?0
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The main difference between an incandescent bulb and a fluorescent bulb is that the incandescent bulb
A) uses electromagnetic radiation to heat a wire, while a fluorescent bulb uses magnetic fields to heat a gas. B) sends an electric current through a gas while the fluorescent bulb heats a thin wire electrically. C) uses electric current to heat a wire, while a fluorescent bulb sends an electric current through a gas. D) heats a wire by sending an electric current through it, while the fluorescent heats a solid powdery material by sending a current through it. E) heats a wire by sending an electric current through it, while a fluorescent bulb uses magnetic fields to heat a gas.