Homework Statement
How far behind the mirror is the image of an object that is located in front of a flat (plane) mirror?
Why do you think the image produced by a flat (plane) mirror is called a virtual image
Homework Equations
The Attempt at a Solution
Well, this is what i came to:
Find the heat lost by the water, if it is cooled to 0 C:
(.3)(4186)(75) = 94185
Calculate the heat needed to melt the ice:
(.02)(33.5e4) = 6700Q left:
( 94185 - 6700) = 87485
Final temp = 87485 / ( .32)(4186) = 65.3 C
The answer is 66.5 C. I...
Homework Statement
A 200.0 g aluminum calorimeter holds 300g of water at 75 C. 20 g of ice at 0 C are added to the water. What is the final temperature of the mixture?
Homework Equations
Use Lf= 33.5 x 104
Cal= 900 J/kg C
The answer is 66.5 C
The Attempt at a Solution...
WOW, I seriously need to get some sleep if I couldn't think of that. I was studying for a physics test all night yesterday.
Thanks a lot gb7nash really appreciate it.
Homework Statement
what is the integral of ln(e2x-1) dx
2. The attempt at a solution
I got
u= ln(e2x-1)
du = 2e2x-1 \ e2x-1
du = 2 dx
1/2(integral of u du)
1/2 ln (e2x-1 ) +c
=
1/4 [ln (e2x-1 )]2 + c
Could you please let me know if this is correct? I don't know how to integrate ln...