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The contains 410 turns and has an area per turn of 3.1 x10-3 m2. The magnetic field is 0.23 T, andthe current in the coil is 0.26 A. A brake shoe is pressedperpendicularly against the shaft to keep the coil from turning.The coefficient of static friction between the shaft and the brakeshoe is 0.76. The radius of the shaft is 0.012m. What is themagnitude of the minimum normal force that the brake shoe exerts onthe shaft?
a photocell that detects the amount of light transmitted through the finger at each wavelength. Identify the frequency of each of these light sources. If 66% of the energy of the red source is absorbed in the blood, by what factor does the amplitu..
A runner covers one lap of a circular track 40.0m in diameter in 63.5s, what was her average speed for that half-lap
Tests of lung capacity show that adults are able to exhale 1.5 liters of air through their mouths in as little as 1.0 second. If a person blows air at this rate through a drinking straw with a diameter of 0.60 cm, what is the speed of air in the stra..
A student throws a set of keys vertically upward to his fraternity brother, who is in a window 3.60 m above. With what initial velocity were the keys thrown
A spherical hot air baloon is initially filled with air at 118 kPa and 18°C and has an initial diameter of 4 m. What is the rate of change of the balloon's diameter when it reaches the inflated diameter
A 200 gram block, attached to the end of an ideal spring (horizontal) with force constant k = 70 N/m, What is the total mechanical energy of the block
A pilot having mass M(kg) flies a plane in a vertical loop with a radius of 800m at a constant speed of 500 km/h. Determine the force exerted on the pilot by the seat at both the top and bottom of the loop
A train is moving parallel and adjacent to a highway with a constant speed of 23 m/s. What is the speed of the car just as it passes the train
A river steamboat travels 36 miles downstream in the same time that it travels 24 miles upstream. What is the currents speed
Infrared spectra are used by chemists to help identify an unknown substance. Atoms in a molecule that are bound together by a particular bond vibrate at a predictable frequency, determine the resonant frequency of this bond and the wavelength of li..
The linear impulse delivered by the hit of a boxer is 248 N • s during the 0.373 s of contact. What is the magnitude of the average force exerted on the glove by the other boxer? React in units of N
At one instant a bicyclist is 49.0 m due east of a park's flagpole, going due south with a speed of 14m/s. Then 35.0 s later, the cyclist is 49.0 m due north of the flagpole, going due east with a speed of 14m/s.
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