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Power windmills turn in response to the force of high-speed drag. For a sphere moving through a fluid, the resistive force, FR is pro- portional to r2v2, where r is the radius of the sphere and v is the fluid speed. The power developed, P = FR v, is proportional to r2v3. The power developed by a windmill can be expressed as P = d r2 v3, where r is the windmill radius, v is the wind speed, and d = 4.72 Ws3/m5 . For comparison, a typical home needs about 3.0 kW of electric power. Note: This representation ignores system efficiency, which is about 25%. For a home windmill with a radius of 1.68 m, calculate the power delivered to the generator if the wind velocity is 12.2 m/s.
Consider a model thermodynamic system in which the allowed (nondegeerate) energy levels are 0, E, 2E, 3E. Determine how many macrostates are possible
Explain why heat can only be transferred from a hot object to a cold object and not the other way around.
A coin is placed 8 cm in front of a concave morror. T he mirror produces a real imege that has the diameter 4 times larger than that of the coin. What is the image distance.
A 89.3-kg horizontal circular platform rotates freely with no friction about its center at an initial angular velocity of 1.53 rad/s. Find the angular velocity of the platform with its load
A 2 kg block and a 3 kg block are pushed across a 2 m long frictionless table, Compare the kinetic energies of the two blocks when they reach the end of the table
one solenoid is centered inside another. the outer one has a length of 45.0 cm and contains 6800 coils, what is the EMF induced in the inner solenoid
When the displacement in SHM is 0.2 the amplitude A, what fraction of the total energy is kinetic energy, What fraction of total energy is potential energy
An electron is in an angular momentum state with l=3, What is the lenght of the electron's angular momentum vector
What is the total flux
You can ignore air resistance. Explain how far from the point of firing does the other fragment strike if the terrain is level?
A 220 g top spinning at 14 rev/s makes an angle of 30° to the vertical and precesses at a rate of 1 rev per 8.0 s. what is the moment of inertia of the top
A jetliner can fly 5.32 hours on a full load of fuel. Without any wind it flies at the speed of 220 m/s. The plane is to make a round-trip by heading due west for a certain distance, turning around, and then heading due east for the return trip.
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