Question

GUYS PLEASE HELP I WILL GIVE MEDAL AND FAN AND TRY TO HELP ON ANY QUESTIONS OF YOURS IN THE FUTURE. PLEASE I NEED HELP IT WOULD MEAN THE WORLD AND I HAVE BEEN TRYING FOR THE PAST HOUR.

By pedaling, you turn the large gear through an angle of 60º. AD = 5 inches, and BC = 3 inches. CD, the length of the chain between the gears, is 17 inches. How far does the chain move around the circumference of the gear to the nearest tenth of an inch? (Enter only the number.)

Answer 1

Is there a graphic for this?

Answer 2

yea give me a sec to post it

Answer 3

k

Answer 4

Hmmm, seems as though I'm the only 1 still here. The question is worded strangely.
1) How far does the chain move around the circumference of the gear?
There are TWO gears so just to make sure, it is talking about the lager gear correct?

Answer 5

well thanks for staying lol and i am also confused abt which gear they are talking about but i am almost positive they are talking about the larger gear

Answer 6

@wolf

Answer 7

@wolf1728

Answer 8

Okay - well we are at least started

Answer 9

lol any idea what to do next

Answer 10

well if aric200 wants to jump in that would be fine :-)

Answer 11

hahaha

Answer 12

tht would b nice

Answer 13

@aric200

Answer 14

As I said the question is worded strangely. Why do we need to know the length of BC or CD?

Answer 15

(I sent a message to aric also).

Answer 16

absolutely no idea why we would need tht length @wolf1728

Answer 17

and thanks ...........if no one else replies i will give you a medal and fan before i close the question for trying:)

Answer 18

Okay I drew my own graphic. Angle BAD would be 60° like the problem says.

Answer 19

but what does tht mean

Answer 20

I thought it would show something - but it sure doesn't.

Answer 21

lol

Answer 22

Hey - looks like we've got some new team mates - feel free to jump in anytime please.
:-)

Answer 23

@ganeshie8

Answer 24

im so confused lol

Answer 25

@iambatman

Answer 26

isnt the circumference all the way around simply

17 +17+3pi +5pi

Answer 27

where did you get tht formula

Answer 28

oh wait i see thats the circumference but after you find tht what can you do

Answer 29

no formula, just the length of chain

half the circumference of each gear is pi *radius

Answer 30

dunbcow - you mean it's the length of the chain? and what does that tell us?

Answer 31

right but what can you do with that?:) im sorry im confused

Answer 32

isnt that what they are looking for?

Answer 33

Then why are they asking for that 60° stuff?

Answer 34

you have to find the circumference to find the answer but they are asking how far the chain moves around the circumference

Answer 35

Couldn't they just ask - what is the length of the chain?

Answer 36

but i dont think that is what they are asking

Answer 37

I agree elle

Answer 38

ya...............

Answer 39

maybe i dont understand the problem correctly

Answer 40

i dont either

Answer 41

I always get into trouble by stating when something is a stupid question but this is a STUPID QUESTION - there are 2 people here with a 99 smart score along with a LOT of other people who can't figure this out.

Answer 42

HAHA i agree wolf

Answer 43

shouldn't an instructor get into trouble for asking ridiculous questions like this?

Answer 44

haha its a virtual class so no instructor can get in trouble

Answer 45

The question is actually very good !

Answer 46

somebody controlas the virtual class - whoever runs the virtual class probably makes money somewhere. Wouldn't it be good for that virtual class if they asked properly worded questions - otherwise they might lose business by acquiring a bad reputation?

Answer 47

ya its so good that it makes no sense lol im sure theres an answer but you would have to be freaking Albert Einstein lol exaggeration

Answer 48

It says that the large gear has been rotated by an amount of 60°. Now they want us to calculate the distance the chain will travel along with the large gear

Answer 49

lol i dont know wolf

Answer 50

uhhhhhh ya abhisar

Answer 51

Abhisar - that is assuming that the chian is in contact with the gear at all times?

Answer 52

I understand the question but unfortunately can't solve since maths is not my forte...don remember any formulas or things like that !

Answer 53

i think the only formula involved is Circumference = 2 pi r

Answer 54

@wolf1728 yes obvsly it will remain in contact.

Answer 55

ohkay lets try !

Answer 56

how

Answer 57

oh ok it wants the arc length then

--> pi/3 * r

Answer 58

so pi/3 * 17

Answer 59

Abhisar obviously it will remain in contact?
let's suppose the gear moves from point X to point Y
how far does the chain travel? SEE NEW GRAPHIC)

Answer 60

We wiull have to calculate the area of this region or arc

Answer 61

Okay 4:30 AM here in Boston - gonna get going
I give up
good luck folks.

Answer 62

@dumbcow will tell the formula for that

Answer 63

pi/3*17=17.8

Answer 64

arc length = angle * radius

Answer 65

angle expresssed in radians..ryt ?

Answer 66

@elle150 , radius of large gear is 5