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Safe Parts Lock
Need Help With a Physics problem realting to kinetic friction?
1. If the coefficient of kinetic friction between tires and dry pavement is 0.80, what is the shortest distance in which you can stop an automobile by locking the brakes when traveling at 29.1 (about 65 )?
2. On wet pavement, the coefficient of kinetic friction may be only 0.25. How fast should you drive on wet pavement in order to be able to stop in the same distance as in part A? (Note: Locking the brakes is not the safest way to stop.)
1. F = uN = umg
W = Fd = umgd
KE = ½mv²
W = KE
umgd = ½mv²
d = (v²/2gu) = (29.1)² / 2(9.8)(0.80) = 54 meters
2. v = sqrt(2ugd) = sqrt(2(0.25)(9.8)(54))
= 16.27 m/s
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Is my beef safe after being exposed to air for hours?
I had some frozen beef sealed in a zip locked freezer bag. I took it out to thaw, then after 6 hours realized that the zip lock bag was open and exposed to the air. The meat is not completely thawed but is very cold and there are some frozen icy parts. I zip locked the bag again then put it in my refrigerator. Is my beef safe to cook and eat?
Yes! Your beef is safe even though it was partially thawed and exposed to air. It is safe to cook any way you like and safe to eat!
However, the same thing cannot be said for frozen chicken.
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