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1- Find the decay constant of cesium-137, half-life 30.2 y; then calculate the activity in becquerels and curies for a sample containing 3 1019 atoms.
2- Calculate the activity A for 1 g of radium-226 with the modern value of the half-life, and compare it with the definition of a curie.
3- A capsule of cesium-137, half-life 30.2 y, is used to check the accuracy of detectors of radioactivity in air and water. Draw a graph on semilog paper of the activity over a 10 y period of time, assuming the initial strength is 1 mCi. Explain the results
4- There are approximately 140 grams of potassium in a typical person's body. From this weight, the abundance of potassium-40, and Avogadro's number, find the number of atoms. Find the decay constant in s1. How many disintegrations per second are there in the body? How many becquerels and how many microcuries is this?
the vertical motion of mass a is defined by the relation x10sin2t15cos2t100. determine a the position velocity and
a random sample of size 56 from a normal population showed a mean of 63 and a sum of squares of deviation from the
Average pressure at end of stroke? Upsetting force required at the end of the stroke? If friction is neglected, what is the amount of upsetting force?
Describe the principle and operation of an hearth furnace. Possible references: Making and Shaping of Steels by the American Society of Metals and Google resources.
what is the specific volume, internal energy (kj/kg) and enthalpy (kj/kg) for water at 1.8 mpa and 120 Degrees C? Locate the state on p-v diagram and document assumptions.
as part of a heat treatment process cylindrical 304 stainless steel rods of 100-mm diameter are cooled from an initial
a strain gauge that has a nominal resistance of 350 ohms and a gauge factor of 1.8 is mounted in an equal-arm bridge
a robot unloads a finished component from a machine and places it on a gravity conveyor. the conveyor accelerates from
what is a beach profile that will provide protection to the infrastructure fronting a beach is it a wide well profiled
The link BD is a single solid bar with a width x thickness measuring 1.000 in. x 0.50 in. If the pins at A, B and D have a diameter of 0.375 in, determine the average normal stress in link BD when:(b) Fx = 0 and Fy =4.00 kips.
The uniform 6-kg slender rod rests on the top center of the 3kg block. If the coefficients of static friction at the points of contact are ua=.4 and ub=.6, and uc=.3, determine the largest couple moment M which can be applied to the rod without ca..
for flow over a circular cylinder as shown below the velocity outside of boundary layer can be estimated to beux 2
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