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1. Would the formation of 1r+ or 1r0 have occurred for a longer time from creation by thermal interactions in the early universe? What is the difference in mean temperatures for their thresholds of formation?
2. Calculate the temperature of the universe when photons can no longer disassociate deuterons. Use the mean value of the distribution.
3. Determine the temperature of the universe when it had cooled enough that photons no longer disassoci- ate the hydrogen atom. Use the mean value of the distribution.
A radioactive isotope has a half-life of 76.0 min. A sample is prepared that has an initial activity of 16.0E10 Bq. How many radioactive nuclei are initially present in the sample
If a heater supplies 1.8×106 J/h to a room5.0 m × 5.2m×3.0 m containing air at 20°C and 1.0 atm, by how much will the temperature rise in one hour, assuming no losses of heat or air mass to the outside?
A plank 2.00 cm thick and 12.4 cm wide is firmly attached to the railing of a ship by clamps so that the rest of the board extends 2.00 m, find the shear modulus of the wood
Lets assume that a very, very small drop of rain starts its way somewhere up in the sky with a mass of m0 and a velocity of 0. We know that when it hits the ground, its usually not that small, and the question of how it grows in mass arises. Lets ..
An alpha particle (which is a helium nucleus Q=+2e, m=6.64 X 10-27 kilogram) is emitted in a radioactive decay with KE= 5.63 MeV. Calculate what is its speed
Two waves are traveling in the same direction along a stretched string. The waves are 90.0° out of phase. Each wave has amplitude of 4.00 cm. Discover the amplitude of the resultant wave.
water moves through a constricted pipe in steady ideal flow. at the lower point the pressure is 1.70 105 pa and the
an artillery shell is fired with an initial velocity of 300 ms at 55.0deg above the horizontal. to clear an avalanche
An electron is confined to a box size of a small atom, 0.10 nm across. What's the uncertainty in the electron's momentum
A large disk with a radius of 20 cm has a string attached to its edge, which is hanging over a table with a 200 g mass attached to it. determine the moment of inertia of the disk
A circular hole of radius 8.468x 10-1 cm must be cut into the front panel of a display unit. What is the difference between the actual area and the desired area of the hole
A tennis ball is struck and departs from the racket horizontally with a speed of 29.4 m/s. The ball hits the court at a horizontal distance of 20.7 m from the racket. How far above the court is the tennis ball when it leaves the racket?
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