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Assume you are helping some friends, working the stage at a rock concert wearing earplugs that provide a reduction of 16 dB. Determine what is the ratio of the sound intensity just outside the plugs to the intensity reaching your eardrums?
A 378 N, uniform, 1.56 m bar is suspended horizontally by two vertical cables at each end. Cable A can support a maximum tension of 502.0 N without breaking, and cable B can support up to 397.0N. You want to place a small weight on this bar. What is ..
You are designing a lathe motor, part of which consists of a uniform cylinder whose mass is 90 kg and whose radius is 0.40m that is mounted so that it turns without friction on its axis, which is fixed.
A railroad car is released from a locomotive on an incline. what negative acceleration must it produce to bring the car to rest
A glass tumbler of 200 g mass and 5 cm inside diameter is full to a depth of 10 cm with tap water whose temperature is 10 degrees C, and at 50 g of ice 0 degrees C are then added. At the end of an hour, it is noticed that the ice has just finished me..
A man sitting in a bosun's chair that dangles from a massless rope, which runs over a massless, frictionless pulley and back down to the man's hand. The combined mass of the man and chair is 86 kg. With what force magnitude should the man pull on ..
Two capacitors are connected in parallel across the terminals of a battery. One has a capacitance of 2.06 F and the other a capacitance of 3.85 F. These two capacitors together store 5.28E-5 C of charge. What is the voltage of the battery?
Physicists define the center of mass of two objects (#1 and #2) with masses m1 and m2 at locations x1 and x2 to be xCoM = m1x1 + m2x2 m1 + m2 The velocity of the center of mass is the derivitive with respect to time of the xCoM. Take the derivativ..
A 0.60 kg body oscillates on a spring that, when extended 1.0 mm from equilibrium, has a restoring force of 7.0 N. find the angular frequency of oscillation
Imagine a landing craft approaching the surface of Callisto, one of Jupiter's moons. What is the weight of the landing craft in the vicinity of Callisto's surface
What is new angular speed of the merry-go-round
A solid wood door 1.00 {m} wide and 2.00 {\m} high is hinged along one side and has a total mass of 44.0kg . Initially open and at rest, the door is struck at its center by a handful of sticky mud with mass 0.700kg , traveling perpendicular to the do..
A 1.12-kg aluminum pot contains 2.25 L of water. Both pot and water are initially at 19.1 °C. How much heat must flow into the pot and the water to bring their temperature up to 95.0 °C
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