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1.) A 2.0-kg tumor is being irradiated by a radioactive source. The tumor receives an absorbed dose of 10 Gy in a time of 910 s. Each disintegration of the radioactive source produces a particle that enters the tumor and delivers an energy of 0.39 MeV. What is the activity N/ t (in Bq) of the radioactive source?
2.) A beam of nuclei is used for cancer therapy. Each nucleus has an energy of 108 MeV, and the relative biological effectiveness (RBE) of this type of radiation is 16. The beam is directed onto a 0.230-kg tumor, which receives a biologically equivalent dose of 210 rem. How many nuclei are in the beam?
A stone is dropped at t = 0. A second stone, with 2 times the mass of the first, is dropped from same point at t = 190 ms. (a) How far below the release point is the center of mass of two stones at t = 390 ms? (Neither stone has yet reached the gr..
One generator uses a magnetic field of 0.15 T and has a coil area per turn of 0.050 m2. What magnetic field should be used in the second generator, so that its peak emf is the same as that of the first generator
A car travelling at 25.0 {rm m/s} runs out of gas while travelling up a 22.0^circ slope. How far will the car go up the hill before it runs out of gas.
A 56 kg student runs at 5.0 m/s, grabs a hanging rope, and swings out over a lake, What is the maximum tension in the rope?
A population of 500,000 around a nuclear facility receives an average wholebody dose of 0.5 rad as a result of an accidental release of radionuclides. Estimate the collective gonad dose received
An artificial lens is implanted in a person's eye to replace a diseased lens. The distance between the artificial lens and the retina is 2.70 cm. What is the power of the implanted lens
A massless pan hangs from a spring that is suspended from the ceiling. When empty, the pan is 50cm below the ceiling. What is the pan's distance from the ceiling when the spring reaches its maximum length
A copper ion with a single electron (denoted Cu28+) is in an excited state with radius the same as that of the ground state of hydrogen. How much energy in eV is needed to ionize the ion from this excited state
A 1.0 ball hangs from the ceiling of a truck by a 1.0--long string. The back of truck, where you are riding with the ball, has no windows and has been completely soundproofed. The truck travels along an exceedingly smooth test track, and you feel no ..
A long straight horizontal wire carries a current I = 2.40Ato the left. What is the magnitude F of the magnitude force on the charge
The passengers in a roller coaster car feel 50% heavier than their true weight as the car goes through a dip with a 28 m radius of curvature, What is the car's speed at the bottom of the dip
If a parallel mirror He-Ne laser had a homogeneous line shape with v=1.5GHz, and small signal peak coefficient of .001/cm length=100cm and reflectance's 100 percent and 97 percent, how many longitudinal modes would initially contribute to the laser o..
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