An official major league baseball has a mass of 0.14 kg. A pitcher throws a 40 m/s fastball, which is hit by the batter straight back up the middle at a speed of
46 m/s.
a) What is the impulse of the ball during the collision with the bat?
b) If this collision occurs during a time of 0.012 seconds, what is the average
force exerted by the bat on the ball?

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

Ineed asap! list 3 examples in which friction us or makes things easier in our daily life. explain the effect of friction for each. *make sure you explain the effect of friction for each example! *

What was the first instrument to ever record an earthquake?