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A motorcycle and a police car are moving toward one another. The police car emits sound with a frequency of 514 Hz and has a speed of 30.0 m/s. The motorcycle has a speed of 13 m/s. What frequency does the motorcyclist hear?
A skier finds that she must give hersel a push to get started down ski slopes with angles less than 8 degrees. What is the coefficient of static friction between the skis and the snow
A certain crystal has a set of planes 0.31 nm apart. A beam of neutrons strikes the crystal at normal incidence, What is the de Broglie wavelength of the neutrons
q1. a 28 kg loudspeaker is suspended 3.0 m below the ceiling by two cables that are each 64 degrees from vertical. what
Two shoppers walk from the door of mall to their car, that is 250m down a lane of cars and then turn 90 degrees to the right and walk an additional 60m what is the magnitude of the displacement of the shopper's car from mall door.
A ladder 2.05 m long, weighing 229 N, initially lies flat on the ground. The ladder is raised to a vertical position. Compute the work done by the force lifting the ladder
carnival merry-go-round rotates about a vertical axis at a constant rate, How far is the man from the center of the merry-go-round
The length of a beam increases by 1.26mm when its temperature is raised from 29.87oC to 71.49 oC. What is the length of the beam at the initial temperature
Find out the angle of the thread. If the locomotive can exert a constant pull of 8.36E+5 N, how long does it take to increase the speed of the train from rest to 80.7km/hr.
A football kicker can give the ball an initial speed of 24 m/s. He is 54 m from the goalpost which has a crossbar 3.46 m high. What is the smallest angle of elevation
In a local bar, a customer slides an empty beer mug on the counter for a refill. The bartender is momentarily distracted and does not see the mug, with what velocity did the mug leave the counter
A particle is located at r=(4.1i+3.1j+5.6k)m . A force F=(9.5j-3.5k)N acts on it. What is the torque, calculated about the origin
A 0.287-kg particle undergoes simple harmonic motion along the horizontal x-axis between the points x1= -0.269 m and x2= 0.473 m. find the total mechanical energy of particle
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