Borek, you were right (and your English is just fine! :) ). Here is how you get the right answer:
L vaporization ethyl = 8.79 x 10^5 J/kg
Qtotal = Q1 + Q2 = (Energy to heat mass up to boiling point) + (Energy used to boil all of mass)
1000 J = mcΔT + mLv
1000 J = m(cΔT + Lv)
m = 1000...
Homework Statement
What is the maximum mass of ethyl alcohol you could boil with 1000J of heat, starting from 18∘C?Homework Equations
Q=mcΔT
c ethyl alcohol = 2400 J/(kg*K)
T boil ethyl alcohol = 78 C = 351 K
T starting = 18 C = 291 K
The Attempt at a Solution
m=Q/(c*ΔT)
m= (2400 J)/[(2400...
It looks like you were right, PhantomJay. I should have seen this before but I didn't check my units. The answer is as follows:
sqrt((2mg/ACp)*(sinθ-μkcosθ))
If you do it this way then you get all of the correct units (m/s) in the end after taking the square root. I used the following:
p...
Thanks for double checking for me, I really appreciate it. :)
I actually tried submitting it with 3 sig figs as well but it said it was wrong. I am going to email my professor and see if they can take a look.
Homework Statement
What is the terminal speed for an 75.0kg skier going down a 35.0∘ snow-covered slope on wooden skis μk= 0.060?
Assume that the skier is 1.60m tall and 0.300m wide.
Express your answer using two significant figures with the appropriate units.
Area skier = A =...
Uniform Circular Motion Question Please Help! (Mechanics/Physics I)
A car initially traveling eastward turns north by traveling in a circular path at uniform speed as in Figure P6.10. The length of the arc ABC is 200 m, and the car completes the turn in 34.0 s.
(figure attached as...
Got it, thanks! :)
Just hearing that it was not an image was enough to make me stop drawing filled-in boxes.
I think I will celebrate by eating some pie
Homework Statement
An advanced alien civilization residing on a planet orbiting Alpha Centauri A, a class G2V star only 4 LY away, detects radio emanations from the star Sol (our Sun) and concludes that it is of intelligent origin. The aliens decide to try and establish contact with the...
I feel like a total noob, but my friend is reviewing distance formula and asked for my help. I can't seem to get the correct answer, which his teacher wrote as (3√5)/5
What is the distance from the line y=2x to the parallel line y=2x+3?
The vertical distance is obviously 3, but that is not...