An amusement park designer wants his swing to have a centripetal acceleration of 21 m/s2. If the velocity of the swing is 13 m/s, how long

should the chain on the swing be?

A. 8.5 m

B. 9.5 m

C. 9.0 m

D. 8.0 m

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

The discovery of the electron as a subatomic particle was a result of

Ais not a mixture. colloid compound suspension solution