How many moles are there in one ounce(28.4g) of pure gold?
a.1.97 x 10-2mol
b.6.94mol
c.0.144mol
d.0.0721mol
e.5.08 x 10-3 mol?

Ais useful when you need a simple machine to you separate two things. a. lever b. screw c. pulley d. wedge

Ajet plane has a sound level of 120 db at a distance of 60 m. what is the q23. sound level at a distance of 6.0 km? (60)2 (6000)? om solution 80db db, hint: 16x assume ultrasound waves travel through the body of an animal at 1540 q24. m/s. if a 30,000 hz signal were reflected off a portion of a heart which was moving toward the source at 3 m/s, what frequency signal would return to the stationary source? solution 30.117hz

(**i would really appreciate if this was answered soon** ) which pair of quantities includes one quantity that increases as the other decreases during simple harmonic motion?