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A tunnel under a river is 2km long. At what frequencies can the air in the tunnel resonate? Explain whether it would be a good to make a rule against blowing your car horn when you are in the tunnel.
The most energy efficient way to send a spacecraft to the Moon is to boost its speed while it is in circular orbit about the Earth such that the new orbit is an ellipse. The boost point is the perigee of the ellipse, and the point of arrival at th..
A 0.51 kg mass vibrates according to the equation x = 0.43 cos 8.37t, where x is in meters, and t is in seconds. (a) Determine the amplitude. m (b) Determine the frequency. Hz (c) Determine the total energy. J (d) Determine the kinetic energy and pot..
In a mall, a shopper rides up an escalator between floors. At the top of the escalator, the shopper turns right and walks 9.41 m to a store. The magnitude of the shopper's displacement from the bottom of the escalator to thestore is 16.0 m. The v..
A 60 kg woman stands on a very light, rigid board that rests on the bathroom scale at each end. She is 1.5m away from one side and 0.5 m from the other.
A woman is riding a Jet Ski at a speed of 28.8 m/s and notices a seawall straight ahead, what is the minimum distance from the seawall that she can begin making her turn and still avoid a crash
the inside and outside temperature of a carnot refrigerator are 10*C and 25*C, respectively. find the work required in each cycle
The Moon's mass is 7.36x10^22 kg and its assumed circular orbit has radius 3.84x10^8 and a period of 27.3 days. Find the moons kinetic energy.
A certain superconducting magnet in the form of a solenoid of length 0.60 m can generate a magnetic field of 6.0 T in its core, Find the number of turns in the solenoid
LASIK eye surgery uses pulses of laser light to shave off tissue from the cornea, reshaping it. What is the power of one laser pulse
question two trains on separate tracks move toward one another. train 1 has a speed of 130kmhr and train 2 has a speed
A 0.24 kg blob of clay is thrown at a wall with an initial velocity of 19 m/s. If the clay comes to a stop in 91 ms, what is the average force experienced by the clay
Excited states do not in general live very long before they decay.Suppose a certain excited state lives just 10^-7 s. In that case weknow the time when the atom is in the excited state quiteaccurately--to within ?t=10^-7 s. That means there is a ..
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