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A 50-g sample of carbon is taken from the pelvis bone of a skeleton and is found to have a 14C decay rate of 200 decays/min. It is known that carbon from a living organism has a decay rate of 15decays=min g and that 14C has a half-life of 5730 years = 3:01 109 min. Find the age of the skeleton.
A freezer has a coefficient of performance of 2.40 and can convert 1.80 kg of water at 25 degree C to ice at -5 degree c in 1 hr.
Large blooms of algae result from high nutrient loading in rivers and lakes, for example, as a result of runoff of fertilizers from agricultural fields.
Express the maximum radius (Rmax) and maximum thickness (Tmax) in terms of bulk oxygen concentration, Cb (mol/mL), diffusivity of oxygen through the device D (cm2/s) and maximum oxygen consumption rate, Vmax (mol/mL/s).
When the load is completely removed without change of excitation currents.
Compute the primary current and the braking torque at the instant of plugging (i.e., reversal of the phase sequence) if the slip immediately before plugging is 0.05.
Consider a diatomic gas, N2, at 298 K. This gas is compressed reversibly and adiabatically from 15 dm3 to 5.0 dm3. Assume that the heat capacity of this gas is CV=5R/2, and that it behaves ideally. Calculate the final temperature, T2, of the gas.
A solution that contains nitromethane in acetonitrile is heated at constant pressure of 1 bar until the first bubble appears. If the temperature at this point is 85 °C, what is the composition of the original solution?
the rate of flow to an ammonia synthesis reactor contains 25 mole ltbrgtnitrogen and the balance hydrogen. the flow
For the conditions indicated in Prob. 7, prepare a log-log plot of fluid velocity in feet per second versus optimum economic pipe diameter in inches. The plot should cover a fluid-velocity range of 1 to 100 ft/s and a pipe-diameter range of 1 to 1..
the equilibrium constant K for the reaction - what is the concentration of SO3 at equilibrium?
According to the paper entitled "Recursive tracking of vascular networks in angiograms based on the detection-deletion scheme" (IEEE Trans. Med. Imaging 12: 334-341, 1993), what is the purpose of deleting a vessel segment from the image immediatel..
adsorption and membrane processeszeolites are used to adsorb a wide range of solutes from vapour and gas streams. what
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