Finding the decibel level of the street
On a workday the average decibel level of a busy street is 80 dB, with 100 cars passing a given point every minute. If the number of cars is reduced to 45 every minute on a weekend, what is the decibel level of the street?
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Arlene is to walk across a high wire strung horizontally between two buildings 11.0 m apart. The sag in the rope when she is at the midpoint is 10.0°, as shown in Figure 4-42. If her mass is 56.0 kg, what is the tension in the rope at this poi
What phase difference between two otherwise identical traveling waves, moving in the same direction along a stretched string, will result in the combined wave having an amplitude 1.6 times that of the common amplitude of the two combining waves?
A tennis ball with a speed of 8.0 m/s is thrown perpendicularly at a wall. After striking the wall, the ball rebounds in the opposite direction with a speed of 6.0 m/s. If the ball is in contact with the wall for 0.018 s, what is the average accel
What is the fractional increase in the thread's length caused by the spider? same as that of the spider's thread?
The heat of vaporization of ethyl alcohol is about 200 cal/g. If 1.3 kg of it were allowed to vaporize in a refrigerator, how many grams of ice would be formed from 0°C water?
337 kg mass is attatched to a spring with a spring constant of 197 N/m so that the mass is allowed to move on a horizontal frictionless surface. The mass i released from rest when the spring is compressed to .162 m. Find the maximum force on the m
Constable Bob inspected skid marks near a traffic accident to determine the acceleration of initial velocity of the lawn mower involved in the accident. Bob measured the lawn mower skid marks to be 32 m long.
Superman meets an asteroid in outer space that is threatening to hit the Earth. He hurls it at 800 m/s, as fast as a bullet. The asteroid is a thousand times more massive than Superman. Using conservation of momentum, what would be his velocity af
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