Light from the Sun reaches Neptune in more than _____
A) 4 hours
B) 5 hours
C) 6 hours
D) 7 hours
A
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Two solid spheres, both of radius 5 cm, carry identical total charges of 2 µC. Sphere A is a good conductor. Sphere B is an insulator, and its charge is distributed uniformly throughout its volume. How do the magnitudes of the electric fields they separately create at radius 4 cm compare?
1. EA > EB = 0 2. EA > EB > 0 3. EA = EB > 0 4. 0 < EA < EB 5. 0 = EA < EB
An object is hung using a metal spring. If now a current is passed through the spring, what will happen to this system?
A) The spring will begin to swing like a pendulum. B) The spring will extend, lowering the weight. C) The spring will contract, raising the weight. D) The weight will not move. E) None of these are true.
You lay on your back and watch the stars for an entire night. You focus on one star and notice that it does not rise or set, nor does it trace circles in the sky. What is your latitude on Earth? Which star would be at your zenith if you stood up? Which significant feature of the celestial sphere lies along your horizon?
What will be an ideal response?
The average rate of erosion on the Moon is far less than on Earth because
A) the crust of the Moon is much denser than the Earth's crust. B) the Moon is much younger than the Earth. C) the Moon lacks wind, water and an atmosphere. D) the Moon's magnetic field protects it from the solar wind better than ours does. E) the Moon's mare long ago dried up, so there is no more wave erosion there.