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A beam of nuclei is used for cancer therapy. Each nucleus has an energy of 128 MeV, and the relative biological effectiveness (RBE) of this type of radiation is 16. The beam is directed onto a 0.15-kg tumor, which receives a biologically equivalent dose of 186 rem. How many nuclei are in the beam?
Starting from rest, you move with a constant acceleration of 2.1 m/s2 for 13.0 s and then move with an acceleration of -2.1 m/s2 for another 13.0 s. How far do you go during the whole trip
An aluminum calorimeter with a mass of 100 g contains 250 g of water. The calorimeter and water are in thermal equilibrium at 10.0°C. Determine the specific heat of the unknown sample
In an X ray scattering measurement the first order diffraction peak is observed at angle 1= 17.4 deg. What is the angle of the third order peak
Calculate the mass of a solid gold rectangular bar that has dimensions lwh = 4.20 cm 12.0 cm 29.0 cm. (The density of gold is 19.3 103 kg/m3.
A certain lightbulb has a tungsten filament with a resistance of 18.0 when cold and 138 when hot. Find the temperature of the hot filament
A device used in radiation therapy for cancer contains 0.29 g of cobalt-60 (59.933 819 u). Determine the activity (in Bq) of the radioactive material
assume that for the couple in, you were told that the girl's mass was two-thirds that of the boy. The boy has a velocity of v = +0.61 m/s. What would be the girl's velocity in this case.
How long did it take for officer to catch up to the car.
suppose that r2/r1 = 10.0 cm and ignoring any air inside the shell, find the temperature of the outer surface of the shell.
The electron in a hydrogen atom is in the first excited state, What is the quantum number n of the state into which the electron moves
An electron beam in an oscilloscope is deflected by the electric field produced by oppositely charged metal plates. If the electric field between the plates is 2.75 105 N/C directed downward, what is the magnitude and direction of the force on eac..
Before throwing a 1.49 kg discus, an athlete rotates it along a circular path of radius 1.18 m. The maximum speed of the discus is 25.7 m/s.
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