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The entrance exposure during a mammography examination is 100mR.
(a) Suppose the photon bean consists of photons each of energy 20 keV. How many photons are incident on a 1 cm^2 surface of breast tissue?
(b) Now suppose the energy of each photon is 50 keV. How many photons are incident on a 1 cm^2 surface of tissue?
A 69-g steel ball is released from rest and falls vertically onto a steel plate. The ball strikes the plate and is in contact with it for 0.5 ms. The ball rebounds elastically, and returns to its original height. The time interval for a round trip is..
Your cup of coffee is too hot to drink when served at 95.0. What is the mass of an ice cube, taken from a -23.0 freezer, that will cool your coffee to a pleasant 59.0
A small plastic ball of mass 9.44 × 10-3 kg and charge +0.181C is suspended from an insulating thread and hangs between the plates of a capacitor, What is the magnitude of the charge on each plate
a meter stick lies along the x axis of the lab frame and approaches the origin with velocity szlig. a thin plate
A small welding machine uses a voltage source of 120 V at 60 Hz. When the source is operating, it requires 1200 W of power, and the power factor is .75. FInd the rms current in the machine while operating
the shear modulus of steel is 8.1x10^10N/m^2. a steel nail of radius 7.5x10^-4m projects 0.040m horizontally outward from thw wall. what is the vertical deflection of the other end of the nail
A long straight wire carries a current of 40 Amp in a region where a uniform external magnetic field has a 30 μT magnitude and is parallel to the current. Obtain the magnitude of the resultant magnetic field
define How long are the skid marks. calculate the time it takes the sled to go 21 m down the slope.
Blood circulating from the heart to the hands and back to the heart travels a distance of about 1.9 m in 42 s. Find the average speed of the blood
An electron has a de Broglie wavelength ? = 7.0×10?10m, What voltage was needed to accelerate it to this speed and What is its speed
a ball is thrown horizontally from a 20-m-high building with a speed of 5.0 m/s , Make a sketch of the balls trajectory
a landing airplane makes contact with the runway with a speed of 40 m/s and moves toward the south. What is the average acceleration of the airplane
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