Recent content by xsc614

Homework Statement A spherical conductor of radius R1 is charged to 28 kV. When it is connected by a long, very thin conducting wire to a second conducting sphere far away, its potential drops to 12 kV. What is the radius of the second sphere as a multiple of R1? Homework Equations...

Update: I used this method for all other points of (x) and got the right answers. Maybe webassign is just not accepting the right amount of sig figs or something... I got 0 for x=0.25m and 0.5m for max displacement, so the velo's were 0 m/s... but since cos(54pi*t) =1, how do you solve for t to...

y(x, t) = 0.022 sin 4πx cos 54π y(x, t) = 0.022 sin 4πx (1) y(x, t) = 0.022 sin (4π(.1m)) (1) y(x, t) = .021 m Answer came back as incorrect. That π character is pi if you can't tell.

Homework Statement The wave function for a standing wave on a string is described by y(x, t) = 0.022 sin 4πx cos 54πt, where y and x are in meters and t is in seconds. Determine the maximum displacement and maximum speed of a point on the string at the following positions. x=0.1m, 0.25m, 0.3m...

Homework Statement Homework Equations Not completely sure, but I believe equation is: Cx = bCs/mVx cx = concentration of sample b= y-intercept cs= concentration of standard m=slope Vx=volume of sample The Attempt at a Solution I plotted the values on a graph with Absorbance...

Ah, okay I was able to the the change in enthalpy for 330.15 K by Hess's law, and adding delta H rxn (298.15K) to the integral of delta Cp dT integrated from To to T. Now I'm stuck on b. part ii. I can't find any examples anywhere on calculating problems like this and my professor is so highly...

Homework Statement Homework Equations ΔH rxn = ΔH products - ΔH reactants ΔU = q + w The Attempt at a Solution Pretty overwhelmed with the entire problem. Since the ΔH's of all reactants and products were in the literature for the reference temperature of 298.15 K, I was able to...

Homework Statement You shoot an arrow into the air. After 0.9 seconds the arrow has gone straight upward to a height of 30.0 m above its launch point. Ignore air resistance. (a) What was the arrow's initial speed? (b) How long did it take for the arrow to first reach a height of 15 m above...

Thats basically restating what the problem says. Are there any formulas to relate them to each other, like proportions? This problem seems impossible to answer without knowing like the time it took for the first mile or some other piece of info.

Can someone help me with this problem? Driving along a crowded freeway, you notice that it takes a time t to go from one mile marker to the next. When you increase your speed by 4.5 mi/h, the time to go one mile decreases by 11 s. What was your original speed? I cannot figure out how to...