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An archaeologist finds Carbon-14 in a sample of 3.10g of material to be decaying at 107 counts per second. A modern 1.00g sample of the same material decays at 151 counts per second. How old is the sample? (Half-life of Carbon-14 is 5730)
When an AC source is connected across a 15.0-? resistor, the rms current in the resistor is 7.10 A. Find the rms voltage across the resistor. Find the peak voltage of the source. Find the maximum current in the resistor
a ball mass m60g is shot with speed vi22ms into the barrel of a spring gum of mass m240g initially a rest on a
consider the bohr model of the one ecectron atom Be+3, calculate the radius,in nm,of ground state orbital
A pipe 0.026 m in diameter and 0.22 m long can transfer 3476 J of heat per second with a temperature difference across the ends of 7?C. Compare this performance with the heat transfer of a solid silver bar of the same di- mensions by finding the rati..
A clarinet has a fundamental frequency of 147 Hz, and, when played, has one end closed. How many harmonics appear below 1350 Hz
Nitrogen forms hydrides. One of them, A, is acidic and contains 2.3% of hydrogen. Another, B, is a base containing 87.5% of nitrogen. In what molar ratio do they combine if it is known that the salt formed by their combination contains 6.7% hydrogen?
You are preparing for a 5-day backpacking trip where you plan to use a gasoline cook stove for about 30 min each morning and night. Estimate the minimum amount of gasoline you should take on your trip
A heat engine operates between a cold reservoir at 10 C and a hot reservoir at 200 C. how much heat must be exhausted as waste
A rod of 2.0-m length and a square (2.0 mm x 2.0 mm) cross section is made of a material with a resistivity of 6.0 x 10 ^-8 ohms m. What is heat generated in the rod
A crate of weight W is being pushed across a horizontal surface by a force directed at an angle of 20 degrees below the horizontal. find the magnitude of the normal force on the crate
Begin with the appropriate law and derive an expression for the magnetic field at a point P a perpendicular distance R from a long straight wire carying a constant current i. Be sure show and explain all steps.
A person lies on a balance board as shown in the figure below. The person weights 80 kg, and the scaleunder the person's feetreads 30 kg. Compute the position of the person's center of gravity
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