A7 kg object attached to a horizontal string moves with constant speed in a circle on a frictionless horizontal surface. the kinetic energy of the object is 36 j and the tension in the string is 326 n. find the radius of the circle. answer in units of m.

If an inclined plane is 5 m long and 2 m high, what is its mechanical advantage? a. 2.5 b. 3 c. 7 d. 10

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 passage that directs air to the lungs is called a. diaphragm. b. larynx. c. bronchi. d. pharynx.