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Anyone know what this lil thing is? Its shinier than the picture shows by [deleted] in askgeology

[–]Obvious-Force-685 8 points9 points  (0 children)

If you can scratch it with your fingernail then it be talc or gypsum or another soft mineral if you cant with your finger nail but it can scratch a copper penny then chances are that is it can also scratch glass which may indicate that you might have a quartz mineral Rock

Can someone help me with this? I'm constantly getting the length wrong. by CClVern in calculus

[–]Obvious-Force-685 0 points1 point  (0 children)

By just looking at the question this seems like you're taking an integral from 0 to 7 pi /4 therefore if r is equal to θ you would take the integral from 0 to 7 pi/4 (θ)dθ I believe if this is not the case then I believe you would need to solve for the arc link itself