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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.
A uniform 270N ladder rests against a perfectly smooth wall, making a 40.0? angle with the wall. What is the friction force on the ladder at the floor
A 3.00-kg mass undergoes an acceleration given by a = (2i+5j ) m/s2. The magnitude of the net force is
A novice skier, starting from rest, slides down a frictionless 33.0° incline whose vertical height is 128 m. How fast is she going when she reaches the bottom
A major league catcher catches a fastball moving at 80.0mi/h and his hand and glove recoil 10.0 cm in bringing the ball to rest. If it took 0.00500s to bring the ball (with a mass of 300g ) to rest in the glove,
You are studying guitar strings and are able to measure a few of (but not all) the standing wave frequencies for a particular string. what is the highest possible value for the fundamental frequency
An organ pipe is open at both ends. It is producing sound at its fifth harmonic, What is the length of the pipe
A conducting spherical shell with a total uniformly distributed charge of -4Q on the combination of inner and outer surfaces has a point charge at the center of the shell
A vector has components of 7.0 units along the x axis and 9.0 units along the y axis. What is the angle between the vector and the x axis
Calculate the absoute pressure at the bottom of a fresh-water lake at a depth of 28.9 m. Assume the density of the water is 1.00x10^3 kg/m^3 and the air above is at a pressure of 101.3 kPa
The venturi flowmeter shown in the figure is used to measure the flow rate of water in a solar collector system. The flowmeter is inserted in a pipe with diameter 1.9 {rm cm}; at the venturi of flowmeter the diameter is reduced to 0.64 {rm cm}. Th..
A meat baster consists of a squeeze bulb attached to a plastic tube. While the bulb is squeezed and free, with the open end of the tube under the surface of the basting sauce.
A 1100-kg sports car (including the driver) crosses the rounded top of a hill (radius = 85.0 m) at 23.0 m/s. Determine the normal force exerted by the road on the car
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