Problem on average intensity level
Suppose you call your dog with an average intensity level of 80 decibels (db). How much more sound energy would you have to put into each call to:
a. Increase the call to 90 db?
b. Increase the call to 100 db?
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A certain bubble gum company includes a picture card of a famous basketball player in each pack of bubble gum it sells. A complete set of cards consists of n players. Suppose that every pack you buy is equally likely to contain the picture of any
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The steel ball A of diameter D slides freely on the horizontal rod which leads to the pole face of the electromagnet. If the ball is released from rest at x = 0, determine the velocity v with which it strikes the pole face.
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A cylinder fitted with a smoothly sliding piston contains 200 liters of argon gas at 140 kPa and 10degC. Calculate the sign and magnitude of the work done and heat transferred in this process.
Calculate the diameter of a medium carbon steel pin in double shear subjected to a suddenly applied shearing force of 150000N.
Suppose 1800J of heat are added to 3.6 mol of argon gas at a constant pressure of 120 kPa. Find the change in internal energy and temperature for this gas. Calculate the change in volume of the gas. Treat argon as if it is an ideal monatomic gas.
Infrared lamps are used in cafeterias to keep food warm. How many photons per second are produced by an infared lamp that consume energy at the rate of 95W and is 14% efficient in coverting this energy to infrared radiation?
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