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Energetic proton Cosmic ray primary protons with energy up to 1020 eV (almost 10 J) have been detected. Our galaxy has a diameter of about 105 light years. (a) How long does it take the proton to traverse the galaxy, in its own rest frame (proper time)? (1 eV = 1.6 × 10-19 J, Mp = 1.67 × 10-27 kg.) What is the proper time for a photon to traverse our galaxy? (b) Compare the proton's energy to the kinetic energy of a baseball, mass = 145 g, traveling at 100 miles/hour.
a rectangular channel 3-m-wide carries 10 m3s at a depth of 2m. is the flow subcritical or supercritical? for the same
A refrigeration cycle maintains a clean room at 68oF by removing energy entering the room by heat transfer at the rate of 0.21 Btu/s. The cycle rejects energy by heat transfer to the outdoors where the temperature is 80oF.
Determine the mean effective pressure of an ideal Otto cycle that uses air as the working fluid; it's state at the beginning of compression is 13 psia and 56°F; it's temperature at the end of combustion is 1,525°F; and it's compression ratio is 11. U..
a partivcle along a plane cirve from point a to a point b. the path length between a and b is 60 in. the speed at a is
consider a finite wing with an aspect ratio of 7 the airfoil section of the wing is a symmetric airfoil with an
the buoyancy force acting on a 500 kg balloon is fb6kn and the air resistance is fd100v n where v is in ms. determine
large cylindrical bales of hay used to feed livestock in the winter months are d2m in diameter and are stored
How much oil must be released from a press cylinder with a 20 in bore to relieve the pressure from 2800 psi to 0 psi if the ram is extended 20 in? The compressibility of the fluid is .525% per thousand psi.
calculate the energy efficiency of a continuous glass melter that uses room temperature air for burning methane gas.
On a hot summer day, a student turns his fan on when he leaves his dorm room in the morning. The dorm is well insulated but not air conditioned, and all of the doors and windows are closed. Draw a simple picture of this room after the student leaves ..
Calculate the ratio of final pressure to the intial pressure Calculate the final temperature Change in internal energy Calculate the molar specific heat capacity of the process.
the bar rotates in the horizontal plane about a smooth pin at the origin. the 2 kg sleeve a slides on the smooth bar
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