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500W sirens of two ferries approaching each other emit at equal frequency of 300Hz. However the captain of one ferry hears the sound at a frequency of 348Hz, while the captain of the other ferry hears it at a frequency of 347Hz. Find the speed of each ferry. At what distance between the ferries is the sound intensity 82db?
A sprinter of mass 72.8 kg runs at a constant speed of 10.8 m/s in a straight line. Find the extra force the sprinter must exert on the ground to round a curve of radius 10.4 m
A horizontal 792-N merry-go-round is a solid disk of radius 1.43 m, Find the kinetic energy of the disk after 2.92 s
A child holds a candy bar 10.0 cm in front of a convex mirror andnotices that the image is only one-half the size of the candy bar. What is the radius of curvature of the mirror?
A skier (m=63.0 kg) starts sliding down from the top of a ski jump with negligible friction and takes off horizontally. If h = 6.10 m and D = 12.2 m, find H.
A kicker punts a football from the very center of the field to the sideline 36 yards downfield. What is the direction of the net displacement of the ball
An object undergoing parabolic motion travels
A lady pushes down on a 35.0 kg crate (constrained to move along a horizontal floor) at an angle of 47.3 degrees to the horizontal with a force of 125N along a frictionless surface. what is the normal force of the surface on the crate
A fireman clings to a vertical ladder and directs the nozzle of a hose horizontally toward a burning building. The rate of water flow is 6.28 kg/s, and the nozzle speed is 13.0 m/s. The fireman holds the nozzle 1.42 m vertically above his boots on..
When the decibel of traffic in the street goes from 40 to 60 dB, How much louder does the traffic noise seem
While riding her bicycle on a 140 meter track, a rider took 18 seconds on her first lap and 17 seconds on her second
Some European trucks run on energy stored in a rotating flywheel, with an electric motor getting the flywheel up to its top speed of 370 ? rad/s. If the truck uses an average power of 7.7 kW, for how many minutes can it operate between chargings
a 5.5cm -thick layer of oil n1.46 is sandwiched between a 1.1cm -thick sheet of glass and a 2.3 cm-thick sheet of
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