Uppose we observe a cepheid variable
Uppose we observe a Cepheid variable in a distant galaxy. The Cepheid brightens and dims with a regular period of about 10 days. What good will this observation do us?
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Three equal point charges, each with charge 2.00 , are placed at the vertices of an equilateral triangle whose sides are of length 0.650 . What is the electric potential energy of the system? (Take as zero the potential energy of the three charges
Create a response for each of the investigations listed from a through f.For each of the following investigations:Identify the causal hypothesis at issue.Identify what kind of investigation it is.Describe the control and experimental groups.
Use Bernoulli's equation to estimate the upward force on an airplane's wing if the average flow speed of air is 192 m/s above the wing and 164 m/s below the wing. The density of the air is 1.5 kg/m3 and the area of each wing surface is 26 m2.
A 35.0-g bullet strikes a 4.3-kg stationary piece of lumber and embeds itself in the wood. The piece of lumber and bullet fly off together at 7.6 m/s. What was the original speed of the bullet?
A pitcher throws a curveball that reaches the catcher in 0.61 s. The ball curves because it is spinning at an average angular velocity of 370 rev/min (assumed constant) on its way to the catcher's mitt. What is the angular displacement of the bas
Weigh the relative importance of the Industrial and Market revolutions in changing the American economy. In what ways was the economy different in 1860 from what it had been in 1800? How would you explain those differences?
When an 85.0-kg adult uses a spiral staircase to climb to the second floor of his house, his gravitational potential energy increases by 1.70 x 103 J. By how much does the potential energy of a 23.0-kg child increase when the child climbs a normal
The volume of a gas collected when the temperature is 11 degrees Celsius and the pressure is 710 mmHg measures 14.8 ml. What is the calculated volume of the gas at 20 degrees Celsius and 740 mmHg?
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