What percentage of the original activity in the sample
A sample to be used for medical imaging is labeled with 18F, which has a half life of 110 minutes. What percentage of the original activity in the sample remains after 300 minutes?
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Two parallel circular plates with radius 7.0 mm carrying equal-magnitude surface charge densities of ±3.0 µC/m2 are separated by a distance of 1.0 mm. How much stored energy do the plates have?
You are given a solid that is a mixture of sodium sulfate and potassium sulfate. a o.205g sample of the mixture is dissolved in water. An excess of an aqueous solution of barium chloride is added. the barium sulfate tat is formed is filtered, drie
Determine the lowest speed of rotation of the shaft at which the maximum stress will not exceed 60 MPa and the angle of twist will not exceed 2.5 degrees.
Suppose a lot is received and it has 3% defective, i.e. there are only 3 defectives in the lot of 100 units. What is the probability that it will be accepted? Please write the mathematical equation for the probability of acceptance, and then calcu
Determine the total change in: (a) length, (b) cross-sectional dimensions, and (c) volume. For the analysis, assume the alloy exhibits elastic behavior with E = 22.7 Times 10 6 psi and v = 0.28.
A 2600 kg truck traveling north at 40 km/h turns east and accelerates to 55 km/h. (a) What is the change in the truck's kinetic energy?
A bar of length L and mass M is fixed at one end and free at the other. What mass m is attached to the free end to decrease the fundamental frequency of longitudinal vibration by 25% from its fixed, free value?
The fund earns 8 % per year. How much money must be deposited to the fund at the end of the year 0 to just deplete the fund after the last withdraw.
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