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A Geiger counter registers a count rate of 4,800 counts per minute from a sample of a radioisotope. Eight minutes later, the count rate is 1,200 counts per minute. What is the half-life of the radioisotope?
Gamma rays (γ-rays) are high-energy photons. In a certain nuclear reaction, a γ-ray of energy 0.685 MeV (million electronvolts) is produced. Compute the frequency of such a photon
Differentiate between the following three types of plain carbon steels.
gas is confined in a tank at a pressure of 1.19e6 pa and a temperature of 14.2degc. if half of the gas is withdrawn and
On a banked race track, the smallest circular path on which cars can move has a radius of 106 m, compute the largest speed at which cars can move on this track without relying on friction
n = 4.64 mol of Hydrogen gas is initially at T = 343 K temperature and pi = 2.01×105 Pa pressure. How much work did the external force perform
Based on the graph of kinetic energy given (gray curve in the graphing window), sketch a graph of the baseball's gravitational potential energy
A 1.1 kg block of ice is initially at a temperature of -5°C. If 4.8 ? 105 J of heat are added to the ice, what is the final temperature of the resulting liquid water
Are these numbers plausible? Do some arithmetic to back up your conclusion. Suppose, for example, that the crew is as large as the passenger list. How many cups of coffee must each person drink every day?
A thin ring of radius R carries a charge 3Qdistributed uniformly over three-fourths of its circumference, and -Q over the rest
consider a spring that does not obey hookes law very faithfully. one end of the spring is fixed. to keep the spring
A hydrogen atom initially in the ground state absorbs a photon, which excites it to the = 9.00 state, Determine the wavelength and frequency
A potter's wheel of radius 0.26 m is turned on at t = 0 and accelerates uniformly. Find the angular acceleration and the total angular displacement of the wheel during this time
In a supermarket, you place a 22.3 N (around 5 lb) bag of oranges on a scale, and the scale starts to oscillate at 2.7 Hz. What is the force constant (spring constant) of the spring of the scale
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