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Electric companies supply the area homes with 1 kiolwatt of power for one hour for an average cost of 8.5 cents. A kilowatt-hr equals 3,600,00 J. How do you convert your work to cents in that 8.5 cents = 3,600,00?
A point source generating a spherical sound wave at 50Hz, Calculate the amplitude of the particle velocity at r=3m from the source
A 1000 kg flat railroad car is rolling to the right at 4.5 m/s. A 60 kg man, is standing on the right end of the cart watching the track in front of the car. What is the final speed of the train car with the mud stuck to it
An electron of mass 9.11 10-31 kg has an initial speed of 2.80 105 m/s. Determine the magnitude of the force exerted on the electron
A converging lens has a focal length of f = 22.0 cm. An object is placed 41.0 cm from the lens. Find the size of the image in cm if the object has a height of 4 cm. express answer with one decimal place.
find the angle counterclockwise relative to the horizontal.
A uniform plank of length 4.3m and weight 236N rest horizontally on two supports, with 1.1m of the plank hanging over the right support. To what distance x can person who weighs 450N walk on the overhanging part of the plank before it just begins ..
a boy pulls a loaded wagon having a total mass m=100kg. He applies a constant force F=100N along the handle at 30 degrees, compute the horizontal force on the wagon
If the magnetic field strength is 0.845 T, what is magnitude and direction of the magnetic force on the wire between the poles
A 50.0-kg child on a 2.0 m long swing is released from rest when the swing supports make an angle of 30 degrees with the vertical. find the potential and kinetic energies of the child
Vector has a magnitude of 7.20 units and makes an angle of 39.5° counter-clockwise from positive x-axis. Vector has a magnitude of 8.00 units and is directed along the negative x-axis.
A sound wave from a police siren has an intensity of 103.1 W/m2 at a certain point; find the intensity level of the sound wave due to the ambulance?
Two sinusoidal waves of the same period, with amplitudes of 5.5 and 7.5 mm, travel in the same direction along a stretched string; What is the phase constant of the other wave
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