How did Hubble use the cosmological redshift to determine distance?
What will be an ideal response?
The redshift is caused by the Doppler effect as a result of the galaxy's velocity. Hubble found that when known galactic distances (determined with a standard candle) were plotted with the recessional velocity, all the data fell on a straight line. The slope of this line is Hubble's constant. This allowed him to use a measured redshift (or calculated velocity) to read the distance off the plot, or to use the equation to calculate the distance.
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Complete the following statement: Around any closed-circuit loop, the sum of the potential drops
a) dramatically with the addition of each resistor. b) in each loop is the same. c) equals the sum of the potential rises. d) equals the emf of the battery. e) increases with the addition of each resistor.
The type of adhesive that cures by the exclusion of oxygen is called ___________.
Fill in the blank(s) with the appropriate word(s).
The current in two identical light bulbs connected in series is 0.25 A. The voltage across both bulbs is 110 V. The resistance of a single light bulb is
A) 22 ohms. B) 44 ohms. C) 220 ohms. D) 440 ohms. E) none of the above
Every square inch of our body, at sea level, sustains ______________ of atmospheric pressure
a. 14.7 lb b. 1.47 g c. 14.7 g d. 1.47 lb