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In an experimental radiation therapy, an equivalent dose of 0.400rem is given to a localized area of tissue with a mass of 0.170kg by 0.800Mev protons. How many protons are absorbed by the tissue? How many alpha particles of the same energy of 0.800Mevare required to deliver the same equivalent dose of 0.400?
An electron passes through a point 3.91 cm from a long straight wire as it moves at 33.7% of the speed of light perpendicularly toward the wire. The wire carries a current of 11.3 A. Find the magnitude of the electron\'s acceleration at that point.
An electric field is E=(200 N/C) i in the region x>0 and E=( - 200 N/C) i in the region x
A parallel plate capacitor (air filled) that is maintained at a 20.0 V potential difference between plates, Calculate the surface charge density, and the charge on each plate
A juggler on stilts throws a ball straight up, from a height of 2.5cm. It reaches a height of 3.5m, and then falls back to the ground. What is the impact velocity when it hits the ground
Two astronauts are 1.40 m apart in their spaceship. One speaks to the other. The conversation is transmitted to earth via electromagnetic waves. How far away from the earth is the spaceship
Explain how the earth’s geomagnetic field is created? Hint: be sure to include thedirection of the earth’s current. Why is Northern Canadabombarded by more intensecosmic radiation (solar wind) than Mexico is? Why do astronauts keep to altitudesbeneat..
A uniform chain with a mass of 1.47 kg per meter of length is coiled on a table. One end is pulled upward at a constant rate of 0.381 m/s. Calculate the net force acting on the chain
A 121.2 N carton is pulled up a frictionless baggage ramp inclined at 27.0 degrees above the horizontal by a rope exerting a 73.2 N pull parallel to the ramp's surface. Calculate the work done on the carton by the gravity
A rocket fires two engines simultaneously. One produces a thrust of 615 directly forward while the other gives a thrust of 474 at an angle 39.6 above the forward direction.
A car is moving on a flat horizontal circular track of radius 120 m. The speed of the car is constant, 15m/s. The mass of the car is 1200 kg. What force is keeping the car in the circle
A 3500 resistor and a 1.7 µF capacitor are connected in series across a generator (60.0 Hz, 120 V rms)
A 250 kV power transmission line carrying 500 A is hung from grounded metal towers by ceramic insulators, What fraction of the power carried by the line is this
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