- #1

physicsgal

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## Homework Statement

1) a car is traveling at 80km/h, and is towing a trailer. the wheels of the trailer are 40cm in diameter.

*a) determine the angular velocity in rad/s and degrees/s*

radius = 40cm/2 = 20 cm

distance traveled in 1 hr = 80km = 8,000,000

1 hr = 3600s

distance traveled in 1s = 8,000,000/3600 = 2,222.222

#of rotation in 1s = 2222.222/20pi = 35.37

angular velocity = 35.27 x 2pi = 70.74pi rads

70.74pr x (180/pi) = 6,372 degrees per second

*b) through what angle does the tire turn in 60s? state your answer in radians and degrees*

for this one i could just go 35.37 x 60s = 2122.7

360degrees x .7 = 252degrees?

252degrees x (pi/180) rad = 4.4 rad

?

and then i have to explain why radians are better than degrees in these types of questions. i haven't the foggiest idea.

~Amy