Aperson standing 1.20 m from a portable speaker hears its sound at an intensity of 5.50 ✕ 10−3 w/m2. hint (a) find the corresponding decibel level. db (b) find the sound intensity (in w/m2) at a distance of 36.0 m, assuming the sound propagates as a spherical wave. w/m2 (c) find the decibel level at a distance of 36.0 m. db

Next a skier is pulled by a tow rope up a frictionless ski slope that makes an angle of 15 with the horizontal. the rope moves parallel to the slope with a constant speed of 0.69 m/s. the force of the rope does 800 3 of work on the skier as the skier moves a distance of 8.4 m up the incline. (a) if the rope moved with a constant speed of 2.2 m/s how much work would the force of the rope do on the skier as the skler moved a distance of 8.4 m up the incline? at what rate is the force of the rope doing work on the skier when the rope moves with a speed of (b) 0.69 m/s and (c) 2.2 m/s?

Idon’t quite understand this problem

In a heat engine if 1000 j of heat enters the system the piston does 500 j of work, what is the final internal energy of the system if the initial energy was 2000 j? 1. write the equation 2.list out your known variables 3.plug the numbers into the equations 4.solve 5.write your solution statement that includes initial energy and final