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A machine shop has 100 equally noisy machines that together produce an intensity level of 90 dB. If the intensity level must be reduced to 80 dB, how many machines must be turned off?
A 58 ice cube can slide without friction up and down a 28 slope. The ice cube is pressed against a spring at the bottom of the slope, When the ice cube is released
After the box starts sliding, the person continues to push it, exerting the same force. What is the acceleration of the box
Typical field strengths are a few femoteslas (1fT=10^-15T). An adult brain is about 140mm wide, A reasonable magnetic field is 4.35fT at the sensor. According to this model, what is the current in the brain?
A 600g mass is traveling west (positive x-axis) at 8.0 m/s undergoes an inelastic collision with a stationary 250g mass. If the 600g mass travels at an angle of 40 (o) above the x-axis and with a speed of 3 m/s
A tuning fork with a frequency of 440 Hz is held just above the top of a uniform glass tube containing water. What is the speed of sound in air
A modem is designed to transmit at 100 kbps over a channel with 15 dB signal to nose ratio. Find the maximum symbols on the constellation of this modem.
A door has mass M, width W, and height H. It is attached to a door frame by only two hinges: one at 5H/6 (the top hinge) and one at H/6 (the bottom hinge). Calculate the force that the door frame exerts on each hinge
A disk of inertia .10 kgxm2 is rotating with an angular speed of 1.0 rad/s. A non-roatating ring of mass .5 kg, What is the new angular speed of this combination
A skier who starts from rest reached a speed of 8.0m/s while goind down a ski slope for 5.0s. how far does the skier travel in this time
Given that the radius of the Moon is roughly one-quarter that of the Earth, find the mass of the Moon in terms of the mass of the Earth
Calculate the angle of refraction at the first surface
The rotor in a certain electric motor is a flat, rectangular coil with 85 turns of wire and dimensions 2.25 cm by 4.36 cm. The rotor rotates in a uniform magnetic field of 0.800 T. What is the average power of the motor
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