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Calculate the dose in Sv to the chest of a patient given an x-ray under the following conditions. The x-ray beam intensity is 1.50 W/m2, the area of the chest exposed is 0.0750 m2, 35.0% of the x-rays are absorbed in 20.0 kg of tissue, and the exposure time is 0.250 s.
A spherical capacitor contains a charge of 3.50nC when connected to a potential difference of 220V. Calculate the radius of the inner sphere
A long, cylindrical conductor of radius R carries a current I as shown in the figure below. The current density J, however, is not uniform over the cross-section of the conductor but is a function of the radius according to J = br3, where b is a c..
In the Bohr model of the hydrogen atom, an electron moves in a circular path around a proton. The speed of the electron is approximately 2.19 106 m/s. Find the centripetal acceleration of the electron
A proton starts out moving horizontally from a positive plate to a negative plate of equal size and equal magnitude of charge. Calculate this difference of heights in meters
The infamous chicken is dashing toward home plate with a speed of 5.80 while he decides to hit the dirt. The chicken slides for 1.1, just reaching the plate as he stops (safe, of course).
An object is placed to the left of a lens, and a real image is formed to the right of the lens. How far from the lens is the object
A copper wire has a resistance of 0.575 ohm at 20.0°C, and an iron wire has a resistance of 0.595 ohm at the same temperature. At what temperature are their resistances equal
a frictionless stick of mass m and length l lies at rest on a frictionless horizontal table. a mass km where k is some
An archeologist on a dig finds a fragment of anancient basket woven from grass. What is the age of the basket
A metallic wire has a diameter of 4.12 millimeter. When the current in the wire is 8.00 Amp, the drift velocity is 5.40 ×105 m/s. Compute the density of free electrons in the metal
A resistor with R = 90 ohm is connected to a battery with emf 2.4 V. What is the current through the battery
a 3.0w source of light produces monochromatic beam of wavelength 550 nm . this beam is incident on a metal surfae with
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