Physics question on axis of motion

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

Determine el momento angular de un rueda de 3000g moviendose a 10m/s con un radio de giro de 400cm

When you push downward on a book at rest on a table, you feel an upward force. does this force depend on friction? defend your answer.