Recent content by herbally

When I integrate the expression for pressure in terms of volume, I get an answer that is close to the correct answer but still off by a few thousand joules. I think my expression is wrong. I took the equation for volume of a sphere and solved it for diameter. Then I took that solution and...

Not sure but tend to think it's D1.

I realize that pressure and volume are changing. I assume that I need an expression for pressure in terms of volume. Since the given expression for pressure is in terms of diameter, I solved the equation for volume of a sphere for diameter, but, plugging that into the given expression for...

Kind of stuck. Not sure where to go from here.

You're right. Doesn't make much sense since the pressure would get smaller as diameter increases. Back to the drawing board.

The last term should have been 1600/D2. Sorry.

Heat capacity has units of J/g*K. I plugged 100 kPa in for P0, and 400 kPa for P and solved for C yielding a value of 1600 kPa. So then I plugged those values into the given expression and simplified yielding: P = 100 kPa + 1600 kPa/D - 1600 kPa/D So I guess I need this expression...

From the given expression, C should be in Pascals.

Not real sure how to interpret the problem there. I know the initial pressure in the tank is 1MPa and that the pressure added to the balloon is 100kPa, but I assume that P0 is the pressure when the balloon becomes spherical. Am I misinterpreting? EDIT: Just realized that I calculated n0...

Temperature is constant at 20°C. P0 = ? V0 = .5236 M3 n0 = 21.49 mol Pf = 400kPa Vf = 33.51 m3 nf = 5502 mol My inclination is that I should back-solve for P0 using the given expression, but I don't know what C is. Heat capacity is my only thought, but neither pressure or volume is...

Homework Statement An initially deflated and flat balloon is connected by a valve to a storage tank containing helium gas at 1 MPa at ambient temperature of 20°C. The valve is opened and the balloon is inflated at constant pressure of 100 kPa (atmospheric pressure) until it becomes...

I solved Snell's law for sin(θ2) which yielded n1sin(θ1)/n2. I set that equal to n2/n1. Then I solved for n2 which gave me n2=+-n1√sin(θ1). When I solve I get some value like .98755 which is less than one making it obviously incorrect.

Homework Statement A light ray passes downward into a block of transparent plastic with an angle of incidence of θ1 = 77.7°. If total internal reflection is to occur when the light strikes the left edge of the block at interface B, what is the index of refraction of the plastic? Homework...

WOW. NM. I'm rum-dumb at this point. I got it. Thanks a ton.

Naturally the initial velocity is negative. I'm failing to see the correlation. Then again, I've been doing physics for about 3 hours straight so all the numbers are beginning to run together. Perhaps another nudge? Thanks.