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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. )
The sun is 150,000,000 km away. The mass of the sun is 2x1030 kg, the mass of the earth is 6x1024 kg. What is the torque of the earth on the sun
A 5.05 micro F capacitor is initially charged to a potential of 16.2 V. It is then connected in series with a 3.80 mH inductor. What is the total energy stored in this circuit
A ball of clay weighing 0.5 kg is thrown at a pendulum bob at rest weighing 4-kg. What is the velocity of the pendulum bob
The electric field component of a sinusoidal electromagnetic wave traveling through a plastic cylinder is given by the equation E = (5.35(V/m))cos[(1.39x10^7 (rad/m))x-(3.02x10^15(rad/s))t]
Source charge Q1= -3.00nC located at (0, 5.00mm). Source charge Q2= +2.00nC located at the origin. Find the Magnitude & direction of the net electric field
A race-car drive buys a car that can accelerate at +5.9m/s^2. find the distance the two drivers travel before they are side by side
A community wants to construct a hazardous waste incinerator for household hazardous waste. The cost of the facility is expected to be $4,000,000. What is the annual cost of this facility to the community
In 1.00 second an automatic paintball gun can fire 15 balls, each with a mass of 0.113 g , at a muzzle velocity of 90.0 m/s . Calculate the average recoil force experienced by the player
the potential difference between the accelerating plates of a tv set is about 25 kv. if the distance between the plates
A 27 year-old biologist makes a trip to study lifeforms in a distant planet 17 light-years away. How old is she when she returns according to her clock
the small spherical planet called glob has a mass of 6.50times1018kg and a radius of 6.20times104m. an astronaut on the
An experiment is performed in deep space with two uniform spheres, one with mass 24 kilogram and the other with mass 100 kilogram. Obtain the magnitude of the relative velocity with which one sphere is approaching to the other
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