A hearing aid is essentially a system consisting of a tiny microphone, amplifier, and speaker. A particular hearing aid boosts the sound level by 33.0 dB. If a sound has a frequency of 100 Hz at an intensity of 3.10 ✕ 10−11 W/m2, what is the intensity (in W/m2) produced by the hearing aid? W/m2

f=gm1m2/d^2 it d

f is force g is gravitaiton constant, m1 is mass of first object, m2 is mass of second object. d is distance between two object

see earlier answer

the total distance that martina travels that day is

(distance from home to mom's office) plus (distance from mom's office to school)

plus (distance from school to library) plus (distance from library to friend's house)

plus (distance from friend's house to martina's house).

(we don't know what any of these distance actually is.)

see the picture for the vector

the magnitude of the vector by pythagorean theorem

r = √( (-10)^2 + (3)^2 ) = √109

magnitude = √109 units

the direction angle between vector and x-axis is

tan^(-1)(3/10) = 16.699

so the direction is approximately 16.7 degrees north of west