Atrain station bell gives off a fundamental tone of 500 hz as the train approaches the station at a speed of 20 m/s. if the speed of sound in air is 335 m/s, what will be the apparent frequency of the bell to an observer riding the train?
a. 532 hz
b. 530 hz
c. 470 hz
d. 472 hz

what best describes physical development during adolescence is the development of secondary sex characteristics happens at a rate unique to each individual.

yup its correct its: c) b b

kepler used the data from tycho blahe (his mentor) to construct the laws of planetary motion.

can be answered using momentum.

momentum = p

p1= mass1 * velocity1

p1 = p2

therefore

p1 = 6kg * 4m/s

p1 = 24kgm/s

p2=m2 * v2

24 kgm/s = 7kg * v2

v2 = 24 kgm/s / 7kg

v2= 3.42 m/s