At a distance 30 m from a jet engine, intensity of sound is 10 w/m^2. what is the intensity at a distance 180 m?

Explanation:

Intensity is given by the expresion:

where:

Io = inicial intensity

r1= initial distance

r= final distance

the small 0.38-kg slider is known to move from position a to position b along the vertical-plane slot. determine (a) the work done on the body by its weight and (b) the work done on the body by the spring. the distance r = 0.70 m, the spring modulus k = 154 n/m, and the unstretched length of the spring is 0.53 m

explanation:

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