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After a plant or animal dies, its 14C content decreaseswith a half-life of 5730 years. If an archaeologist finds anancient firepit containing partially consumed firewood, and the14C content of the wood is only 17.5% that of anequal carbon sample from a present-day tree, what is the age of the ancient site?
barium has a work function of 2.48 ev. what is the maximum kinetic energy of electrons if the metal is illuminated by
Consider a homemade capacitor, which consists of 2 8.5" x 11" aluminum foil sheets separated by 10 sheets of paper. Estimate the capacitance of this device. What effect does the paper have on the capacitance
A standard 35mm slide measures 24mm by 36mm. Suppose aslide projector produces a 60cm by 90cm image of the slide on a screen. What is the distance between the slide and the screen
When two identical ions are separated by a distance of 5.9 10-10 m, the electrostatic force each exerts on the other is 6.0 10-9 N. Evaluate how many electrons are missing from each ion?
we have a parallel plate capacitor separation of 0.2mm capacitance C0= 21 nF we fill it with 20g of silicone oil & density 520 kg/m^3, find the max charge on the plate before dielectric breakdown
a sealed 29 m3 tank is filled with 9000 moles of ideal oxygen gas diatomic at an initial temperature of 270 k. the gas
A woman is reported to have fallen113ft from a building, landing on a metal ventilator box, which she crushed to a depth of25in. Calculate the time it took to crush the box
In the system shown in the figure, suppose the block has a mass of 3.3 , the spring has a force constant of 450 , and the coefficient of kinetic friction between the block and the floor is 0.19. Find the work done on the block by the spring
It is desired to cool iron parts from 500°F to 100°F by dropping them into water that isinitially at 65°F. how many kilograms of water areneeded per kilogram of iron
At an amusement park, a swimmer uses a water slide to enterthe main pool. what is her speed at the bottom of the slide
A parallel capicitor is made of two plates with cross sectional area A which are separated by a distance d, what is the potential difference measured across the plates
a proton is released from rest in a uniform electric field of magnitude 421 nc. a find the electric force on the
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