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The siren on a police van is emitting a sound whose frequency is 2493 Hz. The speed of sound is 343 m/s.
(a) If the police van is stationary and you (the "observer") are sitting in a parked car, find the wavelength and the frequency of the sound you hear?
(b) Assume that the police van is moving toward you at a speed of 28.7 m/s. Compute the frequency and the wavelength of the sound you hear.
(c) If the police van is moving toward you at a speed of 28.7 m/s and you are moving toward it at a speed of 12.7 m/s, determine the frequency and wavelength of the sound you hear.
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77 N to push a box with an acceleration of 0.55 m/s2. When she increases the pushing force to 85 N, the box's acceleration changes to 0.72 m/s2. What is the mass of the box
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A ball having amass of 150 g strikes a wall with aspeed of 4.8 m/s and rebounds withonly 50% of its initial kinetic energy. What is the magnitude of the impulse on the wall from the ball
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