Question
The $25-m m$ steel slab $1.2 \mathrm{m}$ wide enters the rolls at the speed of $0.4 \mathrm{m} / \mathrm{s}$ and is reduced in thickness to $19 \mathrm{mm} .$ Calculate the small horizontal thrust $T$ on the bearings of each of the two rolls.
Step 1
4 \mathrm{m} / \mathrm{s}$ and is reduced in thickness to $19 \mathrm{mm}$. We are asked to calculate the small horizontal thrust $T$ on the bearings of each of the two rolls. Show more…
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Two solid steel balls, one small and one large, are on an inclined plane. The large ball has a diameter twice as large as that of the small ball. Starting from rest, the two balls roll without slipping down the incline until their centers of mass are $1 \mathrm{~m}$ below their starting positions. What is the speed of the large ball $\left(v_{\mathrm{I}}\right)$ relative to that of the small ball $\left(v_{\mathrm{c}}\right)$ after rolling $1 \mathrm{~m} ?$ a) $v_{\mathrm{L}}=4 v_{\mathrm{S}}$ b) $v_{\mathrm{L}}=2 v_{\mathrm{S}}$ c) $v_{\mathrm{L}}=v_{\mathrm{S}}$ d) $v_{\mathrm{L}}=0.5 v_{\mathrm{s}}$ e) $v_{\mathrm{L}}=0.25 v_{\mathrm{S}}$
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Friction
Friction on Axles, Disks, and Wheels
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