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An ambulance is generating a siren sound at a frequency of 1,800 Hz. The velocity of sound is 335.0 m/s. The observer is traveling at a velocity of 25.00 m/s away from the ambulance and the ambulance is traveling at a velocity of 28.00 m/s away from the observer. What is the frequency of the siren perceived by the observer?
the horizontal surface on which the block slides is frictionless. two forces of magnitude F=25 N. N are applied to the block of mass M=5.0kg, find the magnitude of the resulting acceleration of the block
Dolphins and other sea creatures can leap to great heights by swimming straight up and exiting the water at a high speed. What is the force of the water on the dolphin as it is coming to rest
A solid cylinder of mass M = 2.59 kg is released from rest at the top of an incline of height H= 1.99 m and rolls without slipping to the bottom. Calculate the speed of the cylinder's center of mass at the bottom of the ramp
A 0.750kg block is attached to a spring with spring constant 16.5N/m . While the block is sitting at rest, What are the amplitude of the subsequent oscillations
q1. in a science fiction story a microscopic black hole is given the enormous positive charge by firing an
An upright object is placed a distance in front of a converging lens equal to twice the focal length (f1) of the lens. On the other side of the lens is a converging mirror of focal length f2 separated from the lens by a distance 2(f1+f2).
Length A is measured to be 7.5cm±0.3 cm and length B is 7.0cm±0.6cm. What is the difference between the two lengths, LB - LA
A rectangular block of wood (M = 219 kg) floats on a calm fresh water lake with do = 22.7 cm below the water. Find the mass of the dog
A beam of protons, each with kinetic energy 40 MeV, approaches a step potential of 30 MeV. What fraction of the beam is reflected and what fraction transmitted
An escalator moves 10 people (60 kg each) per minute from the first floor of a store to the second floor, 5 m above. what is the average power required
When 16.8 J was added as heat to a particular ideal gas, the volume of the gas changed from 42 cm3 to 87 cm3 while the pressure remained constant at 1.3 atm. (a) By how much did the internal energy of the gas change
What is the unknown charge at x = +0.19 m in micro-coulombs? If negative, indicate so with a negative sign, but omit a sign if positive.
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