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1. A radioactive source has a half life of 74 days and an activity of 370 MBq. what was the activity 30 days ago?
2. A radioactive source has a half life of 60 days. what is the relative activity after one week?
3. An 11- Ci Ir- 192 source is recieved on August 20. Regulatory requirementss do not allow use of the source until its activity is 10 Ci or less. On what date will the source reach activity?
4. A patient had a 25- mCi I - 125 permanent seed implant 3 years ago. what is the activity now?
5. For a prostate seed implant, I- 125 seeds with an activity of .350 mCi are needed on the day of the implant. the seeds are to be delivered one week prior to the implant. what activity should the seeds have on the day of delivery?
A square conducting loop has side a and carries clockwise current I as shown in the diagram. calculate the magnitude and direction of the magnetic field at the center of the square
an adventurous archaeologist crosses between two rock cliffs by slowly going hand-over-hand along a rope stretched
In 1916 Milikan used measurements of the kinetic energy of photoelectrons to detemine plancks constant
A man with a mass of 62 kilogram skis down a frictionless hill that is h = 2.2 meter high. Find at what horizontal distance from the edge of the ledge does the man land
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Two particles are fixed to an x axis: particle 1 of charge-4.00*10-7 C at x = 6.00 cm, and particle 2 of charge +4.00*10-7 C at x = 18.0 cm. Midway between the particles, what is their net electric field?
can a photon and an electron of the same momentum have the same wavelengths? calculate their wavelengths if the two
A 0.1 T magnetic field points to the east. What is the force on 5 meters of wire carrying 2A of current at a 45 degree angle to the magnetic field
A large man sits on a four-legged chair with his feet off the floor. The combined mass of the man and chair is 95.0 kg. what pressure does each leg exert on the floor
an initially empty bottle is filled with water from a line at 0.8 mpa 350 deg c. assuming no heat transfer and that the
A person runs up a long flight of stairs in 10 seconds. If the person's weight is 600 N, determine the person's power output
An elevator manufacturing company is stress-testing a new elevator in an airless test shaft. Compute its velocity when the cable snapped
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