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A commuter train blows its horn as it passes a passenger platform at a constant speed of 40.0m/s. The train horn sounds at a frequency of 305 Hz when the train is at rest.
(a) What is the frequency observed by a person on the platform as the train approaches? (b) What is the frequency observed by a person on the platform as the train recedes from him? (c) What wavelength does the observer find in each case?
An object starts from point A and moves with constant acceleration in a straight line. 5 seconds after the start, it crosses point B, and 7 seconds after the start it crosses poin
What is the luminous flux of a flashlight that provides an luminance of 145 lx to the surface of water when held 0.50 m above the water?
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