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In 9.00 days the number of radioactive nuclei decreases to one-eight the number present initially. What is the half-life (in days) of the material?
Birds resting on high-voltage power lines are a common sight. The copper wire on which a bird stands is 2.5 cm in diameter, calculate the potential difference between its feet
A 250g steel ball and a 500g steel ball each hang from 3.0-m-long strings. At rest, the balls hang side by side, barely touching. To What angle does each ball rebound
Consider a constant net force of 15.0 N acting on 22 degrees below the x-axis, find the work done by the net force.
A device uses a Stirling cycle on 391 moles of a monatomic ideal gas between two reservoirs with temperatures of 395 K, How much energy does this device remove from the cold reservoir
Radio waves of wavelength 104 m from a galaxy reach a radio telescope by two separate paths, Find the height of the radio telescope dish above the water
A certain medical machine emits x-rays with a minimum wavelength of 0.025 nm. One day, the machine has an electrical problem and the voltage applied to the x-ray tube decreases to 80 percent of its normal value. Now what is the minimum x-ray wavel..
Lily is sprinting in a 100 m dash. at he 80 m mark her velocity is 9.5 m/s. What is the velocity of the air relative to Lily
If you have 0.326 m^3 of water at 25 degrees celsius and add 0.127 m^3 of water at 95 degrees celsius; what is the final temperature of the mixture
A tuning fork vibrating at 516 Hz falls from rest and accelerates at 9.80 m/s2. How far below the point of release is the tuning fork while waves with a frequency of 489 Hz reach the release point? Take the speed of sound in air to be 340 m/s.
What is the repulsive force between two pith balls that are 12.0 cm apart and have equal charges of -26.0 nC?
A weightlifter bench-presses a 170.0 kg barbell from his chest to a height equal the length of his arms 0.750 m. What is the potential energy of the barbell relative to the weightlifter\'s chest after he lifts the barbell
A 2.60kg box that is several hundred meters above the surface of the earth is suspended from the end of a short vertical rope of negligible mass, At what value of t does the box return to its initial position
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