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a positron emission tomography scanner examines the gamma rays emitted when positrons and electrons annihilate each other. since the mass of both the electron and positron is 510 keV/c^2, two 510-keV photon are generated. What is the wavelenth of the photons?
A person with perfect pitch sits on a bus bench listening to the 450{\rm Hz} horn of an approaching car. how fast is the car moving
A 200-pound boy lifts a 40-kg box off of the floor 1.3 meters in 0.7 seconds. determine Which boy is more powerful
If the end of the crutch is a circle of radius 1.0 without the tip, by what factor does the tip reduce the pressure exerted by the crutch
A three level laser has energy levels E 1=1.50 eV, E 2=2.50 eV, and E 3=3.50 eV. Level E 2 is the metastable state. What is the lasing wavelength
Four (and only four) full spectral orders can be seen on either side of the central maximum, find the maximum number of slits per cm for the grating
A 2.4 m long rod of mass m1 = 16.0 kg, is supported on a knife edge at its midpoint. Find the angular momentum of the rod and clay system about the point of support immediately after the inelastic collision
write a two to three page paper in which you1.provide at least three reasons for believing in the accuracy or
Two particles lie on an x axis, particle 1 at x = 1 m and particle 2 at x = 2 m. what happens to the center of mass of the two-particle system
A student driving at a constant speed of 45 m/sec passes a highway patrol car parked on the side of the road. How long does it take to over take the student
A neutral conductor completely encloses a hole inside of it. you observe that the outer surface of this conductor carries a charge of -12 microC. how much charge is on the inner surface of the conductor
A cubic block of lead alloy 0.1m on a side is placed in a bucket of mercury. What is the magnitude of the buoyant force
What credible cosmological models, besides the Big Bang, are out there, and what are their implications for the age of the Universe
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