Recent content by gibson101

When we say potential difference what do we mean? My textbook defines potential difference as the work required to move a unit of electric charge from point b to point a.

Homework Statement The work done by an external force to move a -8.5μC charge from point A to point b is 15x10^-4 J. If the charge was started from rest and had 4.82x10^-4 J of kinetic energy when it reached point b, what must be the potential difference between a and b Homework Equations...

Homework Statement If 2.00 m3 of water at 0°C is frozen and cooled to -25°C by being in contact with a great deal of ice at -25°C, what would be the total change in entropy of the process? Homework Equations ΔS=Q/T Q=mL Q=mcΔT The Attempt at a Solution 2000 * 4190 * ln...

I solved the problem and have the correct answer just not sure about something. Question:What will be the equilibrium temperature when a 274 g block of copper at 317°C is placed in a 137 g aluminum calorimeter cup containing 829 g of water at 13.0°C? So heat lost by copper = heat gained...

okay i see. the difference in pressure for both of them is 980 N/m2. Correct?

but my answer is correct right? 1960 kg/m^2?

I did ρgh x A = buoyant force. So (1000)(9.8)(.2) x 100 = 19600. So Pressure equals 19600/100 since P=F/A so P= 1960. But i think this is wrong.

Calculate the difference in pressure between the top and bottom surfaces of a cube of size 10x10x10 cm at a depth of 20 cm in water. At 100 cm? I know that P=F/A . and in this case force is referring to buoyant force so F=ρgV. And the density of water is just 1000 kg/m^3. And the area of the...

I SEE. BUT i still don't see how θ replaces time. because angular acceleration is Δω/Δt, not Δω/Δθ.

i see that the equation for find angular acceleration was derived from ω^2=ω°^2+2αt. But why can't the formula ω=ω°+αt be used. I noticed that when i used the first formula i ended up with -305/((2∏)(53.8)) = -.9 which is correct but when i used the second formula I got -.073 which is...

I understand how the angular velocity was gotten, and why the amount of revolutions it took to travel 115 m was just 115/circumference of wheel. But why would radians need to be configured to find the angular acceleration? I thought angular acceleration was Δω/τ? And why is 2(thetasymbol) being...

1 liter = .001 m^3. So pascals times cubic meters equals joules? I'm confused.

So to get to joules of work, you have to multiply pascals times volume? And why is the answer divided by a thousand (10^-3)?

Consider the following two-step process. Heat is allowed to flowout of an ideal gas at constant volume so that its pressure dropsfrom PA = 2.7 atmto 1.4 atm. Then the gas expands at constant pressure, from avolume of 6.8 L to VC = 13.1 L where the temperature reaches its originalvalue. See Fig...

My answer is 12.9 grams, and the correct answer is supposed to be 11.9 grams. I cannot figure out why? Note. the answer i got is 12.9, and not 11.06. I know for this situation, the heat absorbed by the ice equals the heat lost by the water and aluminum, and since there is a phase change from a...