Atrain sounds its horn as it approaches an intersection. the horn can just be heard at a level of 52 db by an observer 10 km away. (a) what is the average power generated by the horn? w (b) what intensity level of the horn's sound is observed by someone waiting at an intersection 56 m from the train? treat the horn as a point source and neglect any absorption of sound by the air. db

Around faucet handle is part of a(n) a. lever b. screw c. inclined plane d. wheel and axle

Aprojectile is launched from ground level with an initial velocity of v 0 feet per second. neglecting air resistance, its height in feet t seconds after launch is given by s equals negative 16 t squared plus v 0 t. find the time(s) that the projectile will (a) reach a height of 192 ft and (b) return to the ground when v 0equals112 feet per second. (a) find the time(s) that the projectile will reach a height of 192 ft when v 0equals112 feet per second. select the correct choice below and, if necessary, fill in the answer box to complete your choice.

The softest and hardest minerals are: softest hardest