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One of the limitations on the design of modern windmills for the generation of electricity is that the tip of the blades must not exceed the speed of sound in air (340 meters per second). Otherwise you would get the pressure of the sonic "boom" on the blades that would severely impede the motion of the blades, as well as produce the persistent noise of the boom that would severely impede the prospects of re-election of the politician who had the windmill installed. You come across such a windmill while driving through the mid-west and you estimate the length of its blades to be 42.0 meters. Being a closet physicist you take out your pocket watch and count the revolutions of the blades in one minute to be 46.0.
a) The blade tip speed is what fraction of the speed of sound?
b) What is the acceleration of the blade tips, in m/s2?
A diffraction grating produces a first order maximum at an angle of 20.0°. What is the angle of the second order maximum
A pair of in-phase stereo speakers is placed side by side, 2m apart. You stand directly in front of one of the speakers, 5m from the speaker. What do you hear.
If a circular wire loop of radius 10 were held in this magnetic field, what current would be induced in the loop
a sound wave of frequency 1225 hz travels through the air directly toward a wall, what is the initial wavelength of the sound
Two tiny conducting spheres are identical and carry charges of -21.4C and +51.0C. They are separated by a distance of 3.30 cm. (a) What is the magnitude of the force that each sphere experiences?
A 2.05-kg block is on a plane at 19 degrees with respect to the horizontal. The coefficent of static friction between the block and the plan is 0.80. How many forces are acting on the block
An electron is released from rest at the negative plate of a parallel plate capacitor. How fast is the electron moving just before it reaches the positive plate
Find the rotational frequency of the wheel.
When yellow sodium light, ?=589nm, falls on a diffraction grating, its first-order peak on a screen 55.0cm away falls 3.29cm from the central peak. What is the wavelength of the new source
Three charges are situated at corners of a rectangle. How much energy would be expended in moving the 8µC charge to infinity.
The first controlled, sustained flight in a heavier-than-air craft was made by Orville Wright on December 17, 1903. The plane took off at the end of a rail that was 60 feet long, and landed 12 seconds later, 180 feet away from the beginning of the..
At the start of a race, a four-man bobsled team pushes their sled as fast as they can along a 50 m flat starting stretch. What is the speed of the sled right before the team jumps on the sled
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