How does the age of the universe depend on Hubble's constant, and why?
What will be an ideal response?
The larger the value of Hubble's constant, the younger is the universe. This is because a larger value for Hubble's constant means the universe is expanding faster, which means it took less time to reach its current size.
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Velocity Addition: Consider three galaxies, Alpha, Beta and Gamma. An astronomer in Beta sees each of the other two galaxies moving away from her in opposite directions at 0.70c. At what speed would an observer in Alpha see the galaxy Beta moving?
A. 0.82c B. 0.70c C. 0.94c D. 0.35c E. 0.57c
An LC circuit is to have resonant oscillations at 5.0 MHz. Find the value of a capacitor which will work with a 1.0-mH inductor
a. 2.0 mF b. 1.0 ?F c. 0.020 ?F d. 1.0 pF e. 40 pF
I the inductance and the capacitance both double in an LRC series circuit, the resonate frequency of that circuit will
A. decrease by a factor of 1?2. B. decrease by a factor of 1/4. C. increase by a factor of 2. D. increase by a factor of 4.
If the efficiency of a reversible engine is 28.%,
(a) what is its COP operated as a refrigerator? (b) what is its COP operated as a heat pump?