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Suppose a manufacturing plant has an average sound intensity level of 97.0 dB created by 25 identical machines.
(a) Find the total intensity created by all the machines.
(b) Find the sound intensity created by one such machine.
(c) What's the sound decibel level if five such machines are running?
A 1 KW motor accelerates centrifuge in 1 minute from rest to speed 1000 rmp. Find moment of inertia of the centrifuge
A woman with a mass of 55.0kg is standing on the rim of a large disk that is rotating at an angular velocity of 0.470rev/s, Calculate the magnitude of the total angular momentum of the woman-plus-disk system
A perfect cube with sides of 9.0cm is placed so that one corner is at the origin and its faces are parallel to the coordinate planes, find the total charge located within the cube
n = 2.90 mol of Hydrogen gas is initially at T = 370 K temperature and pi = 2.27×105 Pa pressure. What would be the temperature of the gas, if the gas was allowed to adiabatically expand back to its original pressure
A student throws a water balloon vertically downward from the top of a building, What is the magnitude of its velocity after falling 10.1m and What is its speed after falling for 2.20s
When a rubber band is stretched a distance x, it exerts a restoring force F = -2x + 5x^5. What is the work done in stretching this rubber band from x=0 to x=2.
Find the minimum volume of concrete (y = 23.6 kN/m3) needed to keep the gate (1 m wide) in a closed position; l = 2 m. Note the hinge at the bottom of the gate. Explain briefly.
A moth at about eye level is 11 cm in front of a plane mirror; you are behind the moth, 25 cm from the mirror. What is the distance between your eyes
Two Hydrogen atoms, both with electrons in ground state, are brought close together. What is the angular momentum of an electron in a Hydrogen ground state
A boat moves through the water with two forces acting on it. One is a 1500 N forward push by the water on the propeller, What is the acceleration of the 1400 kg boat
A bus makes a trip according to the position time graph shown in the drawing. Find the average velocity (magnitude & direction) of the bus during each of the segments labelled A, B, & C?
A ceiling fan with 80-cm-diameter blades is turning at 60rpm. Suppose the fan coasts to a stop 30s after being turned off.
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