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A source of sound is located at the center of two concentric spheres, parts of which are shown in the drawing. The source emits sound uniformly in all directions. On the spheres are drawn three small patches that may or may not have equal areas. However, the same sound power passes through each patch. The source produces 2.1 W of sound power, and the radii of the concentric spheres are rA = 0.59 m and rB = 0.85 m. (a) Determine the sound intensity at each of the three patches. (b) The sound power that passes through each of the patches is 2.00 10-3 W. Find the area of each patch.
What is the electric field vec E. What is force vec F on a -1.0 nC charge placed at the midpoint.
What is the distance (in mm) separating the violet (lambda = 400nm) in the first-order band from the red (lambda = 600nm) in the second order.
At an accident scene on a level road, investigators measure a car's skid mark to be 68-m long. It was a rainy day and the coefficient of friction was estimated to be 0.38. Make use of these data to determine out the speed of the car when the drive..
The spheres are then separated so that there is a distance of 200mm between their centers. What is the force between them?
what are the magnitude and direction of its acceleration. A potential difference of 80 mV exists between the inner and outer surfaces of the cell membrane. The inner surface is negative relative to the outer surface. How much work is required to ej..
A 2-kg book with no initial velocity slides down an inclined plane with an angle of 20 degrees a total of 2 meters. The force of friction does 10 Joules of work, what is the final kinetic energy of the system as the book reaches the bottom of the ..
Sketch a free-body diagram of the plank. How far can a painter of mass 70.0 kg walk on the overhanging part of the plank before it tips.
An engineer is designing a pacemaker for cardiac patients. For the 20 year old woman, how many times must device have to beat for her to have a normal life expectancy.
A 1210-N uniform beam is attached to a vertical wall at one end and is supported by a cable at the other end.
A cylinder with a moveable piston contains 178 mL of nitrogen gas at a pressure of 1.22 atm and the temperature of 298 K. What should the final volume be for the pressure of the gas to be 1.52 atm at a temperature of 335 K.
A cylinderical water tank of radius 10ft and height 30ft is half filled with water. How much work is essential to pump all of the water out through a hole in the top of tank.
If a curve with a radius of 85 is perfectly banked for a car traveling 71 , what should be the coefficient of static friction for a car not to skid when traveling at 86.
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