Recent content by luna02525

Homework Statement A sample of 1.00 mol of an ideal gas at 300 K and 101325 Pa is expanded adiabatically in two ways: a) reversibly to .5 atm and b) against a constant external pressure of .5 atm. Determine the values of q, w, \DeltaU, \DeltaH, \DeltaS, \DeltaSsurr, and \DeltaStot for each...

Thanks a lot for your help! :smile:

ok so I took the concentration of ozone and plugged it into PV=nRT V= 1 L P(1 L) = (7.81 x 10^-9 mol)(.082 Latm/kmol)(223 K) P = 1.43 x 10^-7 atm so, now I know the pressure of ozone at 20 km in order to find the mole fraction I would place the pressure of ozone at 20 km over the...

Homework Statement 1. Ozone has a maximum concentration of 4.7 x 1012 molecules/ cm3 at an altitude of 20 km. The total pressure at this altitude is 100 torr. Using the ideal gas law, what is the mole fraction of O3 at that altitude? Now express the mole fraction in ppb. Homework...

Homework Statement Find the speed of a car if the tone of the horn drops by 36 percent as it passes you. The speed of sound is 340 m/s. Answer in units of km/h. Homework Equations f'=f(v/(v-v_source)) solce for v source. The Attempt at a Solution I thought I would just set...

Homework Statement Assume an elastic collision (ignoring friction and rotational motion). A queue ball initially moving at 2.2 m/s strikes a stationary eight ball of the same size and mass. After the collision, the queue ball's final speed is 0.61 m/s. Find the queue ball's angle \theta...

It was indeed my significant figures! Thanks for taking a look at my work. :smile: I was afraid I was completely off.

Homework Statement In a tv set, an electron beam moves with horizontal velocity 2.7 x 10^7 m/s across the cathode ray tube and strikes the screen, 42 cm away. The acceleration of gravity is 9.8 m/s^2. How far does the electron beam fall while traversing this distance? Answer in units of m...

I actually determined a solution for this problem (see edit) but thank you! I did have equations shown and attempted work but incidentally, I erased it all when I found a solution. It took me a while to find it but I'm slowly beginning to understand.

Homework Statement You are standing at the top of the cliff that has a stairstep configuration. There is a vertical drop of 6m at your feet, then a horizontal shelf of 10 m, then another drop of 4m to the bottom of the canyon, which has a horizontal floor. You kick a .93 kg rock, giving it an...

so, y=xtan\Theta \frac{dy}{dt}=\frac{dx}{dt}tan27 \frac{dy}{dt}=35.2379*tan27 ?

Homework Statement Two objects A and B are connected by a rigid rod that has a length 35 m. The objects slide along perpendicular guide rails. If A slides to the left with a constant speed 35.2379 m/s along the x-axis, find the velocity of B along the y-axis when the rod makes an angle 27*...