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Shortly after detonation the fireball of a uranium fission bomb consists of a sphere of gas radius 15 m and a temperature 3E5 K. Assuming that the expansion is adiabatic and that the fireball remains spherical, estimate the radius of the ball when the temperature is 3000K. (Take gamma = 1.4).
A helium balloon can just lift a load of 780 N. The skin of the balloon has a mass of1.0 kg. What is the volume of the balloon
Electrons are emitted from a surface when the light of wavelength 500 nm is shone on the surface but electrons are not emitted for longer wavelengths of light. What is the work function of the surface?
on 2003 august 27 mars was in opposition as seen from the earth. on 2005 july 14 687 days later mars was in western
A microscope uses beams of protons instead of photons/electrons. What wavelength would the beam of protons have if their momentum was acquired from a potential drop of 100 volts? (The answer is 2.87*10^-10 cm, but I don't know how to get there
Six identical books, ( 4cm thick and .8kg mass ), all lie flat on a table. If done in 5sec, what is the power expended
A massless string runs around two massless, frictionless pulleys. An object with mass m = 12.20 kg hangs from one pulley. A force F is exerted on the free end of the string. What is the magnitude of the force F if the object is lifted at the constant..
you are trying to determine the wavelength of a particular line of a samples emission spectrum using a diffraction
A drunk driver in a 1700 kg car plows into a 1300 kg parked car with its brake set. how fast was the drunk going just before the collision
A distant galaxy is moving away from the earth with a speed that results in each wavelength received on the earth being shifted so that wavelength = 1.75. Find the speed of the galaxy relative to the earth
A sanding disk with rotational inertia 7.0 x 10^-3 kg·m^2 is attached to an electric drill whose motor delivers a torque of magnitude 19 N·m about the central axis of the disk. About that axis and with torque applied for 53 ms, what is the magnitude ..
What is the unknown charge at x = +0.19 m in micro-coulombs? If negative, indicate so with a negative sign, but omit a sign if positive.
An electromagnetic wave traveling in the negative x direction has an electric field amplitude of 10.0 V/m in the positive y direction. calculate the amplitude of the magnetic field
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