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A hospital patient has been given 131I (half-life = 8.04 days) which decays at 4.4 times the acceptable level for exposure to the general public. How long must the patient wait to reach the acceptable level? Assume that the material merely decays and is not excreted.
a 4 cm diameter vertical cylinder is sealed at the top by a frictionless piston. the piston is23 cm above the bottom of
In November 2004, the United States tested a scramjet that flew at 10.0times the speed of sound for 11.0s , as measured by engineers on earth. How long did the flight last as measured inside the jet
Four wires meet at a junction. In two of the wires currents I1 = 1.03 A and I2 = 2.05 A enter the junction. In one of the wires current I3 = 6.17 A leaves the junction. Find the current in the fourth wire and indicate its direction.
Valerie is able to do 1200 joules of work in 10seconds. Brett is able to do 5000 joules of work in 50 seconds. Who is more powerful.
To celebrate a victory, a pitcher throws her glove straight upward with an initial speed of 6.5 m/s a) How long does it take for the glove to return to the pitcher? b) How long does it take for the glove to reach its maximum height?
A proton, initially traveling in the +x-direction with a speed of 5.50×10^5m/s , enters a uniform electric field directed vertically upward. After traveling in this field for 4.02×10^7s
A typical red blood cell subtends an angle of only 1.91E-5 rad while viewed at a person's near-point distance of 25cm. Assume a red blood cell is examined with a compound microscope in which the objective and eyepiece are separated by a distance o..
The drawing shows two situations in which charges are placed on the x and y axes. They are all located at the same distance of 6.1 cmfrom the origin O. For each of the situations in the drawing, determine the magnitude of the net electric field at..
A storage tank 30 m high is filled with gasoline. Calculate the force that acts on a square access hatch at the bottom of the tank measures .5 m by .5 m
A spherical steel shell with shell thickness 10 mm rolling down the ramp without slipping.assume that the density of aluminum.
A magnetic field is perpendicular to the plane of a singleturn circular coil. The magnitude of the field is changing,so that an emf of .80V, What emf and current are induced in the square coil
A waterproof rubber ball with bulk modulus 2.725·107 N/m2 is submerged underwater to a depth of 98.69 m. What is the fractional change in the volume of the ball
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