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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?
to heat 1 cup of water 250 cm3 to make coffee you place an electric heating element in the cup. as the water
The electronic spectrum of the molecule butadiene can be approximated using the one dimensional particle in a box if one assumes that the conjugated double bonds span the entire four carbon chain
A solid disk of radius 1.60 m and mass 2.3 kg rolls without slipping to the bottom of an inclined plane. what is the height of the inclined plane
23g of copper pellets are removed from a 300?C oven and immediately dropped into 70mL of water at 23?C in an insulated cup
A swimmer bounces straight up from a diving board and falls feet first into a pool. She starts with a velocity of 4.00 m/s, and her takeoff point is 1.50 m above the pool. What is her velocity when her feet hit the water
A helicopter blade has an angular speed of 6.50 rev/s and an angular acceleration of 1.30 rev/s^2. Find the magnitudes of the tangential speed and acceleration for a point (a) 3.00m from the center of rotation and (b) a point on the blade 6.70 m ..
A force of 40.0 N is required to pull a 10.0-kg wooden block at a constant velocity across a smooth glass surface on Earth. What force would be needed to pull the same wooden block across the same glass surface on the planet Jupiter?
A 100-coil spring has a spring constant of 380 N/m. It is cut intofour shorter springs, each of which has 25 coils. What is the angular frequency of the motion
A 1.99 kg solid sphere (radius = 0.104 m) is released from rest at the top of a ramp and allowed to roll without slipping. The ramp is 0.795 m high and 4.97 m long. What is its translational kinetic energy
Assume that sunlight at the surface of Earth has an average intensity of 1.15E+3 W/m2. Calculate the rms value of the magnetic field in the sunlight
What is the thinnest soap film (excluding the case of zero thickness) that appears black when illuminated with light with a wavelength of 580
a ball is launched with a velocity of magnitude 6.00 m/s, at an angle of 41.0° to the horizontal. find the angle of its displacement from the launch point
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