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

3. a worker pushes a 30.5 kg polished stone along a polished table with a force on bonin a straight line for 5.20 s after starting from rest. there is no friction between thestone and the table. at the end of the table. the stone is hooked to a cable with a lengthof 62.0 cm to rotate it to a rough table to store until they can be picked up. the roughtable has a coefficient of static friction 0.702 with the polished stone. remember that 8= 9.80 m/s2a) what is the speed of the stone when it is hooked to the cable? b) what is the tension in the cable while the stone is rotating? (there is still nofriction)c) how much force is needed to make the stone begin sliding from rest on therough table? ius = 0.70262.0 cm30.5 kg20.5 kg6= 0