A winch is capable of hauling a ton of bricks vertically two stories (6.35 m ) in 24.5 s . If the winch’s motor is rated at 5.80 hp , determine its efficiency during raising the load.

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

A17,250 kg rocket is pushed with a thrust of 6,450,284 n. what is the acceleration of the rocket?

If an athlete runs once around a track, back to the starting line, her average velocity is zero. true or false?