Acompass needle points towards magnetic north because the earth exerts a magnetic force on the compass. does the compass needle exert a force on the earth? if so, is this force larger, smaller, or the same as the force that the earth exerts on the compass? explain why in terms of newton's laws.

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