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Geologist can estimate the age of rocks by their uranium-238 content. The uranium is incorporated in the rock as it hardens and then decays with first-order kinetics and a half-life of 4.5 billion years. A rock contains 83.2% of the amount of uranium-238 that it contained when it was formed. (The amount that the rock contained when it was formed can be reduced from the presencd of the decay products of U-238.) How old is the rock?
the manometer shown above in problem 1 above contains water and kerosene. with both tubes open to the atmosphere, the free surface elevations differ by H=20mm determine the elevation difference when a pressure of 98.0 Pa is applied to the right.
A first class lever in static equilibruim has a 50 lb resistance force and 15 lb effort force. The lever's effort force is located 4 ft from the fulcrum. What is the actual mechanical advantage of the system?
A producer currently hires 20 units of labor and 6 units of capital. The price per unit of labor is $10, the price per unit of capital is $2, and the marginal products of labor and capital are both equal to 20. If the producer increases labor by o..
a power unit has a power rating of 30 kw and supplies flow at a rate of 60 lpm, what is the maximum pressure this unit can withstand?
analyze run-off water for the presence of a.) heavy metals; b.) BTX( Benzene-toluene-xylenes); and c.) PNA ( polynuclear aromatic compounds).
Use potential flow theory to determine the lift coefficient of a spinning baseball in terms of the forward velocity (V ) and spin RPM.
How to get the holding period return for a $980 selling security that purchased fiver years before at $798? Prove that this return overstates the annualized, compound return.
The applicable discount rate is 7 percent. One annuity pays $4,000 on the first day of each year for twenty years. How much does the second annuity pay each year for twenty years if it pays at the end of each year.
Determine the rate of heat loss from the molten salt per meter length of the pipe.
An engine block with a surface area measured to be 0.90m2 generates a power output of 55 kW with a net engine efficiency of 35%. The engine block operates inside a compartment at 157oC and the average convection heat transfer coefficient of 60 W/m..
Compute the amount of heat required to boil 92.1 grams of benzene (C6H6), start from a temperature of 42.5 degrees Celsius.
Calculate the amount of water (in liters) that a camel can produce from 1.0 kg of fat. Assume for simplicity that the fat consists entirely of tripalmitoylglycerol. please show work how you arrive with the answer.
The combustion of alkanes, alkenes and alkynes produces, A. water and carbon. B. carbon dioxide and hydrogen. C. oxygen and hydrogen. D. hydrogen and water. E. carbon dioxide and water.
A 20.94 g sample of an unknown metal is heated to 99.4 C in a hot water bath. The metal is quickly transferred to 100ml of water at 22.0 C in a coffee cup calorimeter.
A 15.00 mL sample of HCL solution of unknown concentration was titrated with .185 M Ca(oh)2 (aq). It took 23.9 mL of the base to reach the equivalence point of the titration.
The few gas analysis shows as carbon dioxide 14%, carbon monoxide 0.4%, oxygen 5.6% and nitrogen 80%. The air used has a dew point of 50°F. The barometer shows 29.9 inches of mercury. Calculate the dew point of the stack gas.
This strontium isotope is radioactive, with a half-life of 28.1 yr. Calculate how long it will take for 0.860 g of the isotope to be reduced to 0.170 g by decay
If another sample of the same compound is decomposed and found to contain 8.46 g of oxygen, how many g of carbon must it contain?
Laboratory-grade diethyl ether contains small amounts of ethanol (1-2%). Is this grade of solvent suitable for the preparation
Which of the following isotopes is more likely to decay via positron emission rather than electron emission.
irregularly shaped object if the initial volume of water was 23.0 ml and the volume rose to 54.3 ml after the object was added?
When dealing with Hydrogenation of Oils, does it matter which double C bond you hydrogenate if there are two or more to make the oil partially hydrogenated?
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