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ANTONII [103]
3 years ago
5

A uniform solid disk and a uniform hoop are placed side by side at the top of an incline of height h. If they are released from

rest and roll without slipping, determine their speeds when they reach the bottom. (d = disk, h = hoop)
Physics
1 answer:
svlad2 [7]3 years ago
3 0

Answer:

) the uniform disk has a lower moment of inertia and arrives first.

Explanation:

(a) the uniform disk has a lower moment of inertia and arrives first.

(b) Let's say the disk has mass m and radius r, and

the hoop has mass M and radius R.

disk: initial E = PE = mgh

I = ½mr², so KE = ½mv² + ½Iω² = ½mv² + ½(½mr²)(v/r)² = (3/4)mv² = mgh

m cancels, leaving v² = 4gh / 3

hoop: initial E = Mgh

I = MR², so KE = ½MV² + ½(MR²)(V/R)² = MV² = Mgh

M cancels, leaving V² = gh

Vdisk = √(4gh/3) > Vhoop = √(gh)

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