How long is one Hubble time?
a. 1/4 the age of the Universe b. 1/2 the age of the Universe
c. the age of the Universe d. double the age of the Universe
c
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Resistors in Combination: Three light bulbs, A, B, and C, have electrical ratings as follows:Bulb A: 96.0 W, 1.70 ABulb B: 80.0 V, 205 WBulb C: 120 V, 0.400 AThese three bulbs are connected in a circuit across a 150-V voltage power source, as shown in the figure. Assume that the filament resistances of the light bulbs are constant and independent of operating conditions. What is the equivalent resistance of this combination of bulbs between the terminals of the power source?
A. 61.5 ? B. 15.3 ? C. 74.0 ? D. 86.2 ? E. 364 ?
Magnetic Field of a Long Wire: The magnitude of the magnetic field that a long and extremely thin current-carrying wire produces at a distance of 3.0 µm from the center of the wire is 2.0 × 10-3 T. How much current is flowing through the wire? (?0 = 4? × 10-7 T ? m/A)
A. 30 mA B. 190 mA C. 19 mA D. 380 mA
Why does the Milky Way appear as a bright band from Earth?
A: Because it's a band type galaxy. B: Because it would look like a beautiful spiral if we could see it the ultraviolet. C: Because it would look like a beautiful spiral if it weren't for the dust. D: Because we are inside it and looking through the disk. E: Because it's really steam coming out of the Teapot (the asterism in Sagittarius).
The law of universal gravitation is written F = GMm/r2. Why did we use the form F = mg when we studied projectile motion?
A. The first form is not valid for projectile motion. B. The first form does not work because it requires two masses. C. The first form is not valid near the surface of Earth. D. The second form is a good approximation to the first and much simpler to use.