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Radioactive isotopes decay according to a first order process. If N(t) is the number of atoms of a radioactive isotope at time t, then N(t)=N(0)e^(-kt).
A. cu-64 (1/2 = 12.8 hr) is used in brain scans for tumors and in studies of Wilson/s disease, a genertic inability to metabolize copper. how many days are requird before the dose of cu-64 administered to a patient drops to 0.10% of its initial activity? (Cu isnt leaving the body by any process other than its normal radioactive decay.)
B. U-238 decays to Pb-206 with a half life of 4.51*10^9 years, A sample of ocean sediment contains 1.50 mg of U-238 and 0.460 mg of Pb-206. estimate the age of the sediment. (assume that Pb-206 is formed only as a resultant of the decay of U-238; you may also assume that Pb-206 is stable and does not itself decay.)
how long does it take electrons to get from a car battery to the starting motor? assume the current is 200 a and the
An oscillating block - spring system has a mechanical energy of 1.70 J, and amplitude of 10.0 cm, and a maximum speed of 1.1 m/s. A) Find the spring constant. B)Find the mass of the block. C) Find the frequency of oscillation. (three questions)
A ball is released from the top of a cliff; it hits the ground 1.1 seconds later. how many meters is the cliff above the ground below
2-kg of nitrogen gas is contained in a 2.1-m3 volume at 3.9 atm. pressure. what is the temperature of the gas? your
A cyclist is traveling at an initial speed of 10.0m/s. She accelerated at a rate of 0.500m/s^2. What is her final speed after 9.
an object having a mass of 8.0 g and a charge of 10.0 x 10-5 c is placed in a uniform electric field e where ex 2.00 x
Your report should comprise be in the form of a two page memo/document that discusses the regulations and explain how they will apply to your hiring process.
two 10 cm diameter charged disks face each other 19 cm apart. the left disk is charged to -50 nc and the right disk is
During an all-night cram session, a student heats up a (0.7 x 10-3 m3) glass (Pyrex) beaker of cold coffee.Initially, the temperature is 18°C, How much coffee(in cubic meters) has spilled out of the beaker
If a four-engine jet accelerates down the runway at 2 m/s2 and one of the jet engines fails, explain how much acceleration will the other three produce?
The displacement of a standing wave on a string is given by D = 9.9 sin(0.55x)cos(56t), where x and D are in centimeters and t is in seconds. What is the distance (cm) between nodes
Four charged particles are at the corners of a square of side. (Let A = 3, B = 4, and C = 5.) (a) Determine the electric field at the location of charge q.
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