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A 2-in-diameter spherical ball whose surface is maintained at a temperature of 170°F is suspended in the middle of a room at 70°F. If the convection heat transfer coefficient is 15 Btu/h · ft2· °F and the emissivity of the surface is 0.8, determine the total rate of heat transfer from the ball.
A uniform magnetic field of 1.5 T points due north. A proton is moving die west in this field at the speed of 2.0 x 107 m/s. Obtain the magnitude and direction of the magnetic force on the proton
A box with a total surface area of 1.01 m2 and a wall thickness of 4.81 cm is made of an insulating material. Find the thermal conductivity of the insulating material
A rod is measured to be 15 cm by an observer moving at 0.80 c with respect to the length of the rod. What is the proper length of the rod
A harmonic signal with a frequency of 1000 hertz and an amplitude of 2 volts is displayed on the oscilloscope. Find what vertical setting for the amplitude (volts/div) will display the peak to peak voltage in 4 horizontal divisions
Conclude the magnitude and directional angle
You are mowing your grass with an electric lawn mower. As you move to taller grass the lawn mower blade slows down. What happens to the current and voltage going to the lawn mower when you move from shorter grass to taller grass?
A fan rotating with initial velocity! = =2rad=s comes to complete stop after15:5 turns, Find the time it takes the fan to stop
a river has a steady speed of 0.500 ms. a student swims upstream a distance of 1.00 km and swims back to the starting
A positive charge of Q = 5.40 uC is fixed in place. From a distance of ri = 4.20 cm a particle of mass m = 5.50 g, What is the minumum distance rf between the two charges
A mass less spring is hanging vertically. With no load on the spring, it has a length of 0.34 meter. estimate what is the acceleration of the mass
What is the normal force that the incline exerts on the block. find the acceleration of the block.
Two 8.0mm×8.0mm electrodes with a0.10-mm-thick sheet of Mylar between them are attached to a 9.0V battery. find the electric field before and after the Mylar is withdrawn
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