Question

HELP PLEASE!!! Can someone please tell me how my answer for this is wrong and give me the right answer? Problem attached below.

Answer 1

What's the area of the whole circle?

Answer 2

Use

\[\Large A = \pi*r^2\]

Answer 3

so its 12.56?

Answer 4

then you multiply that by 35/360

this will get you the area of the slice (that has a 35 degree central angle)

Answer 5

So just multiply 12.56 by 35 which equals 439.6 over 360?

Answer 6

correct

Answer 7

that gives the approximate answer

Answer 8

The area of this segment is only 1.22?

Answer 9

correct

Answer 10

Ok Thanks

Answer 11

oh you round that to the nearest whole number to get 1

Answer 12

np

Answer 13

Ok i just have one more

Answer 14

we want the length of the arc, so we must find the entire perimeter of the circle first

Answer 15

aka, the circumference

Answer 16

So you'd use

\[\Large C = 2*\pi*r\]

Answer 17

awesome ok i got it the answer is 2.7

Answer 18

that is correct

Answer 19

I just have a problem with these because these are the equations they give me

Answer 20

And i used that equation and it didnt work

Answer 21

what did you get?

Answer 22

yes i did it is also one

Answer 23

I need help with this one though

Answer 24

wait, did you want to move on?

Answer 25

Yes i figured out the other one

Answer 26

It was 1

Answer 27

also

Answer 28

what's the gear's circumference?

Answer 29

Umm how do i find that?

Answer 30

think of it as a circle

Answer 31

it has a radius of 8

Answer 32

oops 4 lol

Answer 33

r = 4

Answer 34

so its 25

Answer 35

sorry i had to leave for a moment

Answer 36

what did you get before you rounded?

Answer 37

25.13267.....

Answer 38

so there are roughly 25.13267 inches per revolution (ie 1 rev = 25.13267 inches)

Answer 39

we now use the 8 rpm to help us find the linear velocity