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A gamma ray (a high-energy photon) can produce an electron (e?) and a positron (e+) of equal mass when it enters the electric field of a heavy nucleus: ? ? e+ + e?. What minimum gamma-ray energy is required to accomplish this task?
___________MeV
How long does it take the crate to hit the ground. suppose that the plane continues to fly with the same velocity.
how much weight must each man support. by how much would the temperature of the air rise over a period of 2.0 h due to the metabolism of the people.
A block of mass of 4kg is dragged 2m along a horizontal surface by a force F=30N acting on a 53 degree to the horizontal. Find change in kinetic energy of the block
An uncharged capacitor and a resistor are connected in series to a source of emf. If e m f = 9.00 V, C = 15.0 µF, and R = 100 ?, find the charge on the capacitor after one time constant
What is decrease in kinetic energy throughout the collision.
Calculate the magnetic force per meter between two such lightning bolts separated by 10 meters. (This is mainly to give a feeling for the strength of the magnetic field)
The LC circuit of a radar transmitter oscillates at 30.2 GHz. What is the inductive reactance of the circuit at this frequency
A large tanker truck can carry 30 ton of liquid. (a) What volume of water can it carry? (b) What volume of gasoline can it carry.
A 1.00 kg soccer ball is kicked down field at 5 m/s by a Bob on Team A. Tom, a member of Team B, runs up and kicks the ball so that it is traveling at 15 m/s, what is the impulse acting on the ball
For the polarisers, assume the incident light is linearly polarized, the transmitted intensity (through both polarisers) is 0.15×I0, and the axis of the second polarizer makes an angle θ=41° with the axis of the first polarizer. What is the angle (in..
An underwater diver sees the sun 55 degrees above horizontal. How high is sun above the horizon to a fisherman in a boat above the diver.
A block of mass .250 kg traveling at (1.0 m/s)y hits a second block with a .375 kg mass travelling at (1.2m/s)x.
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