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The old Diefunbunker near Ottawa has two Identical air-raid sirens 5 meters apart horizontally and producing sound in phase at 275Hz. An observer is 1.0 km away on a line at 45 degrees to the line joining the sirens. What is the SHORTEST distance in meters she must walk (in any direction) to get to a location where there is no sound, due to destructive interference? The velocity of the sound is 350m/s.
Two newly discovered planets follow circular orbits around a star in a distant part of the galaxy. What is the orbital period of the faster planet
Starting from a rest a car accelerates at 2.3 m/s2 up a hill that is inclined 5.9 degrees above the horizontal. How far vertically has the car traveled in 15 seconds
a room with 3.0 m high ceilings has a metal plate on the floor with v 0v and a separate metal plate on the ceiling. a
A uniform thin disk (I=1/3ML^2) of length L and mass M is pivoted at one end. It is held horizontal and released. Find the angular acceleration of the stick immeidately after it is released
Three children each of weight 356N make a long raft by lashing together logs of diameter 0.30m and length 1.8m. how many logs will be needed to keep them afloat in fresh water. take density of the logs to be 800kg/m^3.
To test the working of a refrigerator you put a container having two liters of water (=2kg) at 50C in its freezer. How much heat has the refrigerator extracted from the water
the coefficient of static friction is 0.26. If you apply the minimum force needed to get the refrigerator to move, illustrate what will the acceleration then be?
8 equal drops of water are falling through air with a steady velocity of 10 cm/s. then the terminal velocity of the big drop is
Use Pascal's principle. Given that Fout is 68 lb., the areas of the output and input cylinders are Aout 21 in2 and Ain 6 in2, what is the input force
q1. diffraction also occurs with sound waves. consider 1900-hz sound waves diffracted by a door that is 87 cm wide.
In compressing the spring in a toy dart gun, 0.9 J of work is done. When the gun is fired, the spring gives its potential energy to a dart with a mass of 0.05 kg, What is the dart's speed
A defibrillator is used during a heart attack to restore the heart to its normal beating pattern, How many electrons pass through the wires connected to the patient
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