Question

Check my answer please, thanks!



The distance traveled by a sound wave through a substance is proportional to time. The graph shows this relationship for several substances.

Which substances have a unit rate greater than 2 km/s?

Choose all answers that are correct.



A.
cork

B.
glass

C.
lead

D.
titanium



glass,lead, and titanium?

Answer 1

@rebeccaxhawaii

Answer 2

@jim_thompson5910 Please check my answer if you have the time ^_^

Answer 3

hmm how did you get all those anyway?

Answer 4

or say... how do you know glass has a unit greatere than 2 km/s anyway?

Answer 5

Just for the heck of it, identify the slopes of all four graphs.
Next, choose any and all such slopes that are greater than 2 km/sec. Done.

Answer 6

Well I write all the points out as fractions, then divide them till they come out as unit rates.

(10,60) = 60/10=6

(10,40)= 40/10= 4

(10,12)= 12/10= 6/5 or 1.2

(10,5)= 5/10= 1/2 or 0.5


Now that I look at it. I'm thinking titanium and glass only

Answer 7

yes.... that's the "slope" btw,or the the "rate of change" or unit rate

and yes, you're correct, but notice, only Titanium and Glass are greater than 2 though
lead is 6/5 and cork is 1/2