The intensity level of lawnmower at a distance of 1.00m is 100 db. you wake up one morning to find that 4 of your neighbors are moving their lawn 20.0m from your open bedroom window. what is the intensity level in your bedroom?
use the equation
β=10 log (i/io)
and
io=10^-12 w/m^2
do not just give the answer. explain the answer step by step and draw the image also (if i can understand much better).

Acommercial refrigerator with refrigerant-134a as the working fluid is used to keep the refrigerated space at -35°c by rejecting waste heat to cooling water that enters the condenser at 18°c at a rate of 0.25 kg/s and leaves at 26°c. the refrigerant enters the condenser at 1.2 mpa and 50°c. if the compressor consumes 3.3 kw of power, determine (a) the mass flow rate of the refrigerant, (b) the refrigeration load, (c) the cop, and (d) the minimum power input to the compressor for the same refrigeration load.

If state law mandates that elevators cannot accelerate more than 2.40 m/s2 or travel faster than 14.8 m/s , what is the minimum time in which an elevator can travel the 373 m from the ground floor to the observatory floor? ?

If we decrease the time it takes for a car to travel over the same distance this will