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The TL of 10 mm thick sheet of plywood at 1000 Hz is 34 dB. Based on the Mass Law, what is the expected TL:
at 63 Hz?
at 31 Hz for a 20 mm thick sheet?
Two adjacent rehearsal rooms are separated by a 4" thick brick wall (TL250 Hz= 33 dB). The common wall is 10 m high and 10 m long. The total absorption in the receiving room is 200 metric sabins. A guitar playing in one room produces a measured sound pressure level at 250 Hz of 80 dB in that source room.
What is the NR at 250 Hz?
What would the level be in the receiving room?
A fireman, 25.6 m away from a burning building, directs a stream of water from a ground level fire hose at an angle of 39.5° above the horizontal
From the top of a 70 m building, you throw a ball straight up at 6 m/s. The ball misses the building on the way down. What is the maximum height of the ball? What is the velocity of the ball after 2 s?
A swimming pool has dimensions 26.0 m â?? 9.0 m and a flat bottom. The pool is filled to a depth of 1.70 m with fresh water. What is the force exerted by the water on each side
An 18.0g arrow is fired into a 3.00kg pumpkin suspended on a string. find the velocity of the arrow just before it enters the pumpkin
Explain how these principals connect to Einstein's theory of relativity or in modern applications in physics.
Two blocks, one of 50 g and the other of 46 g, are connected by a string and hung over a frictionless pulley which has a radius of 5 cm. What is the moment of inertia of the pulley
A Nordic jumper goes off a ski jump at an angle of 9.8° below the horizontal, traveling 108 mhorizontally and 64.3 m vertically beforelanding. (a) Ignoring friction and aerodynamic effects, calculate the speed needed by the skier on leaving the ra..
A student attempts to "levitate" a piece of current-carrying wire using the Earth's magnetic field (55 T). Find the rate of heat production in the wire
Consider a simple model for the interior of the Earth: there is a spherical iron core with constant mass density ?0 and radius a; outside the core is "rock" with constant density ?1. Calculate the radius a of the iron core
An old Chrysler with mass 2650 kg is moving along a straight stretch of road at 75 km/h. How fast is the center of mass of the two cars moving
The topic chosen for this discussion will be used for discussion in multiple steps of the decision process over the following weeks.
In an L-C circuit, C=3.21*10^-6 F and L=86.0mH. What is the magnitude of the charge on the capacitor at an instant when the current in the inductor has a magnitude of .501mA
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