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After a plant or animal dies, its 14C content decreases with a half-life of 5730 years. If an archaeologist finds an ancient firepit containing partially consumed firewood, and the 14C content of the wood is only 13.1% that of an equal carbon sample from a present-day tree, what is the age of the ancient site?
A 2000kg car accelerates from 20 to 60km/h on an uphill road. Determine the work done by the engine
A young male adult takes in about 4.46 x 10-4 m3 of fresh air during a normal breath. Fresh air contains approximately 21% oxygen. find the number of oxygen molecules in a normal breath
A 48 kg pole vaulter running at 11 m/s vaults over the bar. Her speed when she is above the bar is 1.0 m/s. determine her altitude as she crosses the bar
At one time, television sets used "rabbit-ears" antennas. Such an antenna consists of a pair of metal rods. How long is each rod
Both car A and car B leave school at the same time, traveling in the same direction. Car A travels at a constant speed of 71 km/h while car B travels at a constant speed of 90 km/h. how faris car A from school 2.2 h later.
A water pipe having a 2.2 cm inside diameter carries water into the basement of a house at a speed of 0.85 m/s, What is the water pressure at the second floor
An alert physics student stands beside the tracks as a train rolls slowly past. He notes that the frequency of the train whistle is 443 Hz when the train is approaching him.
A wood block floats on water with 35% of its volume above the surface (of water), what is the average density of the block (in kg/m3)
A 1.2 kg mass attached to a spring oscillates with amplitude of 6.3 cm and a frequency of 1.1 Hz. What is its energy of motion.
An airplane is flying through a thundercloud at a height of 2 km. There are charge concentrations of 30 C at height 3 km at the top of the cloud and -30.0 C at a height of 1km, What is the electric field E within the cloud
Glycerine in water diffuses along a horizontal column that has a cross-sectional area of 2.2 cm2. Determine the diffusion coefficient
One can not align the apparatus to eliminate entirely the effects of the Earth's magnetic field. calculate the component of the earth magnetic field perpendicular to the entering electron beam
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