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In proton-beam therapy, a high-energy beam of protons are fired at a tumor. As the protons stop in the tumor their kinetic energy breaks apart the tumor's DNA, thus killing the tumor cells. For one patient, it is desired to deposit 0.12 Joule of proton energy in the tumor. To create the proton beam, protons are accelerated from rest through a 9000 kV potential difference.
Find the total charge of protons that must be fired at tumor?
suppose a uniformly charged ring in the xy plane, centered at the origin. The ring has radius a and positive charge q distributed evenly along its circumference.
An oscillating LC circuit has a current amplitude of 7.10 mA, a potential amplitude of 250 mV, and a capacitance of 200 nF. What is the maximum energy stored in the capacitor
A disk shaped grindstone of mass 3.0 kg and radius 8 cm is spinning at 600 rpm. After the power is shut off the frictional torque brings the grindstone to rest in 10 s. ? What is the number of complete revolutions of the grindstone after the power is..
A 10-kg body is force against a horizontal elastic spring compressing it an amount of 0.5 meter. When the body was released,it moves on a horizontal distance of 3 meters before coming torest. The force constant of the spring is 50 N/m.
a nearsighted person wears contacts to correct for a far point that is only 3.24 m from his eyes. the near point of his
how to estimate the initial temperature of the hot horseshoe.
The potential difference between the accelerating plates of a TV set is about 25 kV. If the distance between the plates is 1.5 cm, find the magnitude of the uniform electric field in the region between the plates.
A 290-N sphere 0.20 m in radius rolls without slipping 6.0 m down a ramp that is inclined at 25° with the horizontal, What is the angular speed of the sphere at the bottom of the slope
A solenoid 85.0 cm long has a cross-sectional area of 22.0 cm2. It has 1000 turns of wire, and is carrying a current of 6.60 A. What is the magnetic field inside the solenoid
a 75m-long train begins uniform acceleration from rest. the front of the train has a speed of 23 ms when it passes a
While leaning out a window that is 5.5 m above the ground, you drop a 0.60-kg basketball to a friend at ground level. determine the amount of work done by the force of gravity
A dolphin in seawater at a temperature of 25 °C emits a sound wave directed toward the ocean floor 246 m below. How much time passes before it hears an echo? (The speed of sound in ocean water is 1533 m/s.)
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