Wire B has twice the length and twice the radius of wire A. Both wires are made from the same material. If wire A has a resistance R, what is the resistance of wire B?
1. 4R
2. 2R
3. R
4. ½ R
5. ¼ R
4
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Light of wavelength 550 nm in air is found to travel at 1.96 × 108 m/s in a certain liquid. (c = 3.0 × 108 m/s)
(a) What is the index of refraction of this liquid? (b) What is the frequency of the light in air?
You charge a parallel-plate capacitor, remove it from the battery, and prevent the wires connected to the plates from touching each other. When you increase the plate separation, what happens to the value of C?
1.It increases. 2.It decreases. 3.It stays the same.
Why is Galileo Regio, the large circular feature on Ganymede, so dark?
A) It is composed of dense basaltic mantle rock that once flowed like lunar mare. B) It is the result of micrometeorite dust settling onto it over several billion years. C) It has an asphalt-like material that is like the dark side of Iapetus of Saturn. D) It is the result of ultraviolet light from the Sun interacting with the ice and creating a substance that is quite dark. E) It is the site of a recent meteorite impact that scattered a lot of dark, rocky material.
A leaky faucet drips 40 times in 30s. What is the frequency of the dripping?
A) 1.3 Hz B) 0.75 Hz C) 1.6 Hz D) 0.63 Hz