What are the units for force? what are the units for force?
a) force must first be measured in newtons, then converted to pounds.
b) force can be expressed in newtons or pounds.
c) force must be measured in newtons; it can never be measured in pounds.
d)force must be measured in pounds and then converted to newtons.

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