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What is the minimum energy needed to create a electron-positronpair when the photon collides with an electron? I know what to do when it collides with a nucleus, I can not figureout what to do about an electron.
An explosion of a 10.0-kg bomb releases only two separate pieces the bomb was initially at rest and a 4.00-kg piece travels westward at 100 m/s immediately after the explosion. What are the speed and direction of the other piece
An ideal gas expands at a constant total pressure of 2.5 atm from 3.45 L to 6.70 L. calculate the total heat flow into the gas
A uniform plank of length 4.50 m and weight 275 N rests horizontally on two supports, with 1.1 m of the plank hanging over the right support. To what distance x can a person who weighs 456 N walk on the overhanging part of the plank before it just be..
A large air conditioner has a resistance of 7.0?and an inductive reactance of 17?. Find the impedance of the air conditioner
A 5 kg object is dropped from rest 2.5m above the ground. What is the kinetic energy of the object just before it hits the ground
In the Challenger Deep of the Marianas Trench, the depth of seawater is 10.9 km and the pressure is 1.16 x 10^8Pa (about 1.15 x 10^3 atm). What is the density of seawater at this depth
Discover the horizontal and vertical displacement
Tendons are strong elastic fibers that attach muscles to bones. To a reasonable approximation, they obey Hooke's law. Find the force constant of this tendon in N/m
Two indentical spaceships are travelling in the same direction. an observer on earth measure the first to have a speed of 0.80c, what is the speed of second spaceship
A solid uniform marble and a block of ice, each with the same mass, start from rest at the same height above the bottom of a hill and move down it. find Which is moving faster at the bottom of the hill
A uniform diving board, of length 5.21 m and mass 50.4 kg, is supported at two points; one support is located L1 = 3.32 m from the end of the board and the second is at 4.89 m from the end. What is the force acting on the board due to the right sup..
A string is wrapped tightly around the circumference of a wheel with a mass of 1.23 kg and a radius of 0.324 m. find the velocity of the block just before it hits the floor
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