If a source of sound waves is rapidly approaching a person, the sound heard by the person appears to have a. a frequency higher than the original frequency. b. a pitch lower than the original pitch. c. a period higher than the original period. d. an amplitude lower than the original amplitude.

explanation:

areas w steep slopes, west coast, rocky mountains, and appalachian mountains

dec 23, 2016 - a load of bricks weighing 680 n a distance of 10 m across a parking lot. if if the worker pushes the cart with a constant force of 209 n, what work= force x distance = 220 n x 10 m = 2200 n.m = 2200 j i don't know where the person got it from, but the initial part, work= force x distance me.