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Anemometers (pictured) are used to measure wind speeds. Wind striking the cups causes the assembly to rotate; a gauge measures the frequency of this rotation and translates the data into wind speed. The length of each arm, as measured from cup to cup, is 42.5 cm. The friction in the bearings is negligible, so the tangential speed of the cups matches the wind speed fairly closely.
Your company makes anemometers and plans to install light bulbs on them for high wind warnings.The idea is to attach a coil of wire of radius 13.2 cm to one of the arms and use the EMF induced by the magnetic field of the Earth to light the bulb. The bulbs possess 234 ? of internal resistance but need 10.5 W of rms power dissipation to be visible at night. (The resistance of the wire is negligible.) Although company management wants this new feature, you have doubts about its practicality. Assuming the magnetic field of the Earth is 0.500 gauss and is oriented roughly horizontal with the Earth, and that 93.5 mph is considered the threshold of dangerous wind speed, calculate the number of turns in the coil wire needed to light the bulb.
A screen is placed 1.40m behind a single slit. The central maximum in the resulting diffraction pattern on the screen is 1.60cm, What is the distance between the two second-order minima
Though slow on land, the leatherback turtle holds record for the fastest water speed of any reptile: 9.78 m/s. It is also among the largest of reptiles. Assume the largest leatherback yet discovered were to swim at the top leatherback speed. If its k..
A 12.00kg runaway grocery cart runs into a spring with spring constant 260-N/m and compresses it by 65 cm. What was the speed of the cart just before it hit spring.
Estimate the electric field at a point 2.40 cm perpendicular to the midpoint of a uniformly charged 2 m-long thin wire carrying a total charge of 4.10 microC.
resistance R, capacitance C, and inductance L are connected in series, what is the formula for impedence for this circuit
how much tension must a cable withstand if it is used to accelerate a 20.0 kg car vertically upward at 0.70 m/s^2
A student has built a 20-cm-long pinhole camera for a science fair project. She wants to photograph the Washington Monument, How far should she stand from the Washington Monument
The intensity of electromagnetic waves from the sun is 1.4kW/m2 just above the earth's atmosphere. How many Joules of solar energy fall on your back as you work on your tan for 1.1hr
It continues to fly along the same horizontal arc, but increases its speed at the rate of 1.10 m/s2. Find the acceleration in this situation at the moment the hawk's speed is 4.25 m/s. Find out the magnitude and direction (degrees)
An undiscovered planet, many lightyears from Earth, has one moon in a periodic orbit. This moon takes 1710 * 10^3 seconds, calculate the moon\'s radial acceleration.
an electric current of 1.00 A is flowing through a copper filament diameter 1.00 mm, calculate the average electron velocity v and the ?- factor, the positive and negative charge densities in the S' frame
Which of the following must be true if we are to infer (calculate) a star's luminosity directly from the inverse square law for light.
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