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a person pulls a 10kg weight across a floor a distance x=2.0m by pulling on a rope with 50N directed 15 degrees above the horizontal. The coefficient of kinetic friction between the crate and the floor is uk=.20. Identify all the forces in the problem and compute the work done by each one.
If the heat engine used to harvest the energy from humans was operating at the theoretical maximum efficiency what temperature would the cold reservoir have to be make this energy source viable? (Assume the hot reservoir is that of the average ski..
A listener increases his distance from a sound source by a factor of 3.62. what is the change in the sound intensity level in dB
The balance wheel of a watch oscillates with angular amplitude 0.90? rad and period 0.68 s. Find the maximum angular speed of the wheel
An auto goes from 0 to 30 m/s in 5 s, at a uniform rate of acceleration. The radius of the auto's tires is .33 m. How many revolutions per second are the tires making
A 80.0cm3 box contains helium at a pressure of 2.30atm and a temperature of 90.0?C. What is the final pressure in each box
A 500 \mu F capacitor is connected across a 1.25 H inductor. At a certain time, the charge on the capacitor is zero and the current is 0.347 A. What is the peak charge on the capacitor
The light goes through a second polarizer and exits with an intensity of 225 W/m squared? What is the orientation angle of the second polarizer
A long solenoid (diameter = 4.00 cm) is wound with 1500 turns per meter of thin wire through which a current of .220 A is maintained. A wire carrying 5.00 A is inserted along the axis of the solenoid.
Compute the change in entropy of 1 gram of water as it goes from solid ice at 0 celsius to water vapor at 100 Celsuis
A hypodermic syringe contains a medicine with the density of water, Determine the medicine's flow speed through the needle
Three protons are at the vertices of an equilateral triangle 0.800nm on each side. What is the potential energy of this set of charges
how to calculate the average velocity between to minutes. Estimate how for you can throw a ball if you throw it in the following situations.
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