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Jane is standing on the platform waiting for the train. The train approaching the platform from the north at 20 m/s blows its whistle when it is 100 m away from Jane. John, running towards the platform from south, is 50 m away from Jane when the whistle is blown. The frequency of the whistle when the train is at rest is 440 Hz, and the speed of sound in air is 340 m/s.
a) What frequency of sound does Jane hear?
b) John hears a frequency of 475 Hz. How fast is he running?
c) What is the difference in sound level between Jane and John assuming the whistle to be a point source of sound?
Starting from rest, a 12-cm-diameter compact disk takes 2.6s to reach its operating angular velocity of 1600rpm. How much torque is applied to the disk
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At a rock concert, the engineer decides that the music isn't loud enough. He turns up the amplifiers so that the amplitude of the sound, By what percentage does the intensity increase
Imagine that a hypothetical life form is discovered on our moon and transported to Earth. calculate the heat lost by each body from the vaporization of sweat
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A negative charge -0.550 µC exerts an upward 0.600 N force on an unknown charge 0.210 m directly below it. What is the unknown charge (magnitude and sign)
A certain metal with atomic mass (2.1 x 10^-25)kg has an interatomic bond with length (2.3 x 10^-10)m and stiffness 42 N/m
In order to heighten your enjoyment of your 29-carat blue diamond, you view it through a lens held close to your right eye, estimate the focal length of the lens
Biological muscle cells can be thought of as nanomotors that use the chemical energy of ATP to produce mechanical work. How much work is done by such proteins
Harry Potter (55kg) is riding his broom north when a Slytherin casts a spell to knock him from the broom. what is Harry's velocity
The maximum speed of a 2.5-kg mass attached to a spring is 0.55 m/s, and the maximum force exerted on the mass is 11 N. What is the amplitude of motion for this mass
A flashlight bulb with a potential difference of 6.0 V across it has a resistance of 8.5 W. How much current is in the bulb filament
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