Question

A block of mass 3.1 kg hangs vertically from a frictionless pulley of mass 5.9 kg and radius 14 cm. Treat the pulley as a disk. Find:
a) the acceleration of the block;
b) the tension in the rope;
c) the speed of the block after it has fallen 55 cm, assuming it started at rest:

Answer 1

I_disk=1/2 m r^2

Answer 2

is m for both pulley and box?

Answer 3

block feel the effect of gravity
F=5.9 * 9.8

Answer 4

good question , I don't think so but let me think

Answer 5

ok so 57.82

Answer 6

\[\tau= F r\]

\[\tau= I a\]

Answer 7

to reduce confusion
\[\tau=I \alpha\]

Answer 8

\[F r= I \alpha\]

you know F , r, I ; Find \[\alpha\]

once you find \[\alpha\]
divide by r to get a

Answer 9

hold on

Answer 10

wats I