Question

EMERGENCY: NEED HELP Thank You
Two blocks with masses m1 = 3.9 kg and m2 = 6.7 kg are connected by a string that hangs over a pulley of mass M = 2.2 kg and radius R = 0.11 m as shown above. The string does not slip. Assuming the system starts from rest, use energy principle find the speed of m2 after it has fallen by 0.4 m. Treat the pulley as a disk.

Answer 1

emergency?

Answer 2

woops

Answer 3

must of pated the whole thing

Answer 4

pasted

Answer 5

\[1/2 I^2 \omega=m gh\]

Answer 6

you know a diagram would really help

Answer 7

http://gauss.vaniercollege.qc.ca/webwork2_course_files/NYAangoni/tmp/gif/1141851-1305-set11_Rigid_Body-prob6--../Graphics/ch-11-e71.gif

Answer 8

here's the diagram

Answer 9

obviously, it will turn toward mass with bigger mass

Answer 10

net mass
6.7-3.9=2.8

2.8*9.8=27.44 newton

Answer 11

\[1/2 I^2 \omega=m gh\]

\[1/2 I^2 \omega=27.44(.4)\]

you can find I and plug it in.

then solve for \[\omega\]

once you find \[\omega\], divide by r

Answer 12

is mass for both or only the heavier one

Answer 13

this


6.7-3.9=2.8

Answer 14

ok I'll solve it add see if its right

Answer 15

yeah he incorporates integrals into the equations

Answer 16

Is I= mr^2/2

Answer 17

if so, is m for both masses?

Answer 18

Is I= mr^2/2 yes

if so, is m for both masses?
net mass

Answer 19

ok thank you, im gonna solve for the acce..

Answer 20

\[1/2 I^2 \omega=27.44(.4)\]

once you find I , plug it here and solve for omega

Answer 21

I'm not quite getting realistic numbers

Answer 22

I= 1/2 m r^2

= 1/2 (2.2)(.11)^2

I=0.01331

Answer 23

i get 6097.77 for w

Answer 24

wrong thing square
\[1/2 I \omega^2=27.44(.4)\]
\[1/2 (0.01331) \omega^2=27.44(.4)\]
w~~40.6114

Answer 25

oh tats why

Answer 26

divide that by by radius
40.6114/.11m

Answer 27

.11 meter that is

Answer 28

369.19?

Answer 29

that doesn't sound right

Answer 30

and if I multiply I get 4.467

Answer 31

which is also the wrong answer for some reason

Answer 32

is 63.63 right answer?

Answer 33

I'll check

Answer 34

Don't think its right

Answer 35

this question is frustrating

Answer 36

hold on

Answer 37

try 421.084

Answer 38

did you try it?