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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?
Estimate how many times planet has orbited its star
Find out the time that the arrow spends in the air.
An electron is projected with an initial speed 1.00×106 into the uniform field between the parallel plates. Suppose that field between the plates is uniform and fixed vertically downward, and that field outside the plates is zero. The electron enters..
Three concentric, thin, long conducting cylindrical shells have radii of 3.00 mm, 5.00 mm, and 6.00 mm, Find the capacitance per unit length of this configuration
A series RCL circuit has a resonant frequency of 750 kHz, what is the value of the inductance?
The collision is not head-on. After the collision, the two pucks fly apart with the angles shown in the drawing. Find out the final speed of puck A also Find out the final speed of puck B. m/s
A sled weighs 100N. It is held in place on a frictionless 20 degrees slope by a rope attached to a stake at the top, the rope is parallel to the slope. What is the normal force of slope acting on the sled.
A particle of charge Q is fixed at the origin of an xy coordinate system. At t = 0 a particle (m = 0.897 g, q = 3.51 µC is located on the x axis at x = 15.4 cm, moving with a speed of 72.2 m/s in the positive y direction. For what value of Q (in ?..
A bicyclist is finishing his repair of a flat tire when a friend rides by with a constant speed of 3.6 m/s. Two seconds later the bicyclist hops on his bike and accelerates at 2.2 m/s2 until he catches his friend.
Describe briefly a current health problem. A father racing his son has half the kinetic energy of the son, who has one-third the mass of the father. The father speeds up by 2.5 m/s and then has the same kinetic energy as the son.
If the pendulum makes a maximum angle of 5.4? with the vertical, what is the length of the pendulum
Blocks A and B are connected across a frictionless pulley by a cord of negligible weight. If block B lies on a horizontal, frictionless surface and block A hangs vertically, what can be said about the acceelration of block B?
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