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The volume control on a surround-sound amplifier is adjusted so the sound intensity level at the listening position increases from 21 to 59 dB. What is the ratio of the final sound intensity to the original sound intensity?
The cable lifting an elevator is wrapped around a 1.0--diameter cylinder that is turned by the elevator's motor. The elevator is moving upward at a speed of 2.3 . It then slows to a stop, while the cylinder turns one complete revolution.
suppose an electric motor continuously operating with average power 4.65 kW runs the pump. Find its efficiency.
Hydraulic engineers often use, as a unit of volume of water, the "acre-foot", defined as volume of water that will cover 1 acre of land to a depth of 1 ft. A severe thunderstorm dumps 2.0 in. of rain in 30 min on a town of area 35 km2. What volume..
What magnitude of charge must be given to the drop
find the speed of the test charge when it reaches the center of the square.
If the bullet has a mass of 21.5 and a speed of 310 , how high would the block rise into the air after the bullet becomes embedded in it.
A skier (m=55.0 kg) starts sliding down from the top of a ski jump with negligible friction and takes off horizontally. If h = 6.90 m and D = 10.4 m, determine H.
Compute the average intensity
An uncharged capacitor is connected to a 55 V battery until it is fully charged, after which it is disconnected from the battery. A slab of paraffin is then inserted between the plates.
Workers pushing a 180-kg trunk across a level floor encounter a 10-m long region where the floor becomes increasingly rough; the coefficient of kinetic friction enhancements.
A sled weighing 1.0 X 10^2 N is held in place on a frictionless 20.0 degree slope by a rope attached to a stake at the top. The rope is parallel to the slope. What is the normal force of the slope acting on the sled.
At what time does the bolt hit the top of the still-decending elevator.
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