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A refrigerator moves energy from a cold reservoir (the inside of the refrigerator) to a hot reservoir (the kitchen), but some extra energy is required in the form of work done by some outside agent (typically a compressor motor). Just like the efficiency can be used to tell how 'good' an engine is, the Coefficient of Performance can be used to compare refrigerators. If a refrigerator requires 1.37×104 J of work to remove 5.87×104 J of energy from the inside of a refrigerator, what is the coefficient of performance of the refrigerator? How much energy is transferred into the hot reservoir (ie., the kitchen)?
An airtight box has a removable lid of area 1.10 multiplied by 10-2m2 and negligible weight. The box is taken up a mountain where the air pressure outside the box is 0.80 multiplied by 105 Pa.
A raft is made out of 10 logs that are 56cm in diameter and are 6.1m long. How many people (68kg each) can stand on the raft with out getting there feet wet
An electron and proton move in circular orbits in a plane perpendicular to a uniform magnetic field B. Find the ratio of the radius of electron to the proton
Suppose an astronomical telescope is being designed to have an angular magnification of 31.6. If the focal length of the objective lens being used is 84.5 cm, Find the required focal length of the eyepiece
An electron in the beam of a typical television picture tube is accelerated through a potential difference of 20,000 V before it strikes the face of the tube. what is the energy of the electron in electron volts
A narrow tube open at one end has varibale length. When a vibrating tuning fork is held near one end, What is a possible frequency of the tuning fork
Consider a string consisting of two densities, p1 in region 1 where x 0. A continuous harmonic wave is incident from the left. What are the ratios of the square of the amplitude magnitudes for the reflected and transmitted waves to the incident w..
computational biophysics and nanoscale simulationsnamd is a parallel object-oriented molecular dynamics code designed
A satellite is in a circular orbit around the Earth at an altitude of 3.60 106 m. Find the acceleration of the satellite
What is the wavelength of the waves emitted by source? What is the difference in frequency between directly radiated waves and the waves reflected from a whale travelling straight toward the ship at 4.99? Suppose that the ship is at rest in the water..
A 400kg piano slides 4.0 m down a 30 degree incline and is kept from accelerating by a man who is pushing back on it parallel to the incline. Find out the force exerted by the man.
An electron is released from rest at the negative plate of a parallel plate capacitor. The charge per unit area on each plate is ? = 1.81 10-7 C/m2, and the plates are separated by a distance of 1.38 10-2 m. How fast is the electron moving just be..
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