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In the text I claimed that the universe was filled with ionized gas until its temperature cooled to about 3000 K. To see why, assume that the universe contains only photons and hydrogen atoms, with a constant ratio of 109 photons per hydrogen atom. Calculate and plot the fraction of atoms that were ionized as a function of temperature, for temperatures between 0 and 6000 K. How does the result change if the ratio of photons to atoms is 108 , or 101O? (Hint: Write everything in terms of dimensionless variables such as t kT/ I, where I is the ionization energy of hydrogen. )
A wire 30 centimeter long with an east-west orientation carries a current of 3 Amp eastward. evaluate the direction and magnitude of the magnetic field
A plane has an airspeed of 400mph . The pilot wishes to reach a destination 800mi due east, but a wind is blowing at 60mph in the direction 30 degrees north of east. How long will the trip take
After an average acceleration of 3.27m/s2 during a 2.09 s, your car riches a velocity of 15.7 m/s. Find the cars initial velocity
A rotating fan completes 1200 revolutions every minute. Consider a point on the tip of a blade, at a radius of .20 m.
Find out the velocity with which he strikes the water. (Hint: When the diver reaches the water, his displacement is y = -3 m (measured from the board), assuming that the downward direction is chosen as the negative direction.)
A jet airplane is in level flight. The mass of the airplane is m = 8910 kg. What is the magnitude of the lift force acting on the plane
a force of 5.0rm n is required to stretch a certain spring by 1.5rm cm .a. how far must this spring be stretched for
A refracting telescope has an angular magnification of -92.00. The length of the barrel is 1.100 m. What are the focal lengths of the objective
An artificial lens is implanted in a person's eye to replace a diseased lens. The distance between the artificial lens and the retina is2.82cm. What is the power of the implanted lens
A screw with 25 threads per centimeter is driven 1.49 cm into its fixture in 12.4 s with a cordless electric screwdriver. What is the average angular speed of the screwdriver
Consider a Boeing 777-200 airplane of wing span 60.93 m cruising horizontally at Mach 0.785 (about 828 km/h) due north in a region where the earth's magnetic field is .98*10
A green LED has a forward voltage drop of 2.3 V. Estimate the bandgap energy for the semiconductor that makes the green LED
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