Recent content by dalitwil

The first question is extrememly confusing, because it must mean that the temperature is being held constant (and also not given) so the change in internal energy should equal 0, which it doesn't. I cannot find W, without temperature and moles. I am really stuck :frown:

Ok guys, my last questions of the semester, Yay! So I have two of them, one pertaining to a figure (attached), which has me terribly confused: 1.) In the figure (attached), if P1 = 133 kPa, V1 = 1123 cm3 and P2 = 200 kPa, V2 = 10000 cm3, what is the heat absorbed (+) or liberated (-), to...

A conceptual question: A car travels in a circular path with constant speed. Which of the following quantities is constant and non-zero for this car? a.) linear velocity b.) angular velocity c.) centripetal acceleration d.) angular acceleration e.) total acceleration The answer is...

Ok so I used PV=nRT to find pressure: P*(.4L) = (0.075)*(8.31)*(300) =467.43Pa Then I calculated the surface area by setting the volume equal to 3/4pi r^3: find the radius (=.45708) and finding surface A=4pi*r^2 =2.6 Now calculating the F from F=PA gave me 1227. This was incorrect...

I have been having a hard time with the following question: A 400 mL spherical flask contains 0.075 mol of an ideal gas at a temperature of 300 K. What is the average force-magnitude exerted on the walls of the flask by a single molecule? I couldn't really start the problem because I have...

I think I found the equation i was supposed to use: Q/t=(A*delta T)/(L/k) But it still didn't work out. Please help!

A wall is composed of two materials. Material 1 has a thickness of 7.21 cm and a thermal conductivity of 0.1 while material 2 has a thickness of 6.57 cm and a conductivity of 1. If the temperature difference inside to outside is 25 Co and the wall has an area of 10 m2, what is the energy loss...

A mass of .375kg hangs from a string that is wrapped around the circumference of a pulley with the moment of inertia = .0125 kg*m^2 and a radius of .26m. When the mass is released, the mass accelerates downward and the pulley rotates about its axis as the string unwinds. What is the acceleration...

Suppose that when you ride on your 7.00 kg bike the weight of you and the bike is supported equally by the two tires. If the gauge pressure in the tires is 73.5 lb/in2 and the area of contact between each tire and the road is 7.13 cm2, what is your weight? (in Newtons) MY WORK...

I am still completely clueless as to how to get the Amplitude. If I could figure that out, the problem #1 would be much easier to work out. I figure you could use the time t given to get a numerical value for velocity, but how can I relate that to A with other knowns I have? I am not able to...

I have two questions: #1.) The velocity of a simple harmonic oscillator is given by v=-7.22(26.0t) (mks units) If the mass is 0.29kg, what is the spring's potential energy at the time t=40.33? MY WORK: First I found k by using ω^2=k/mass. This equaled 196.04. I couldn't really...

Right, the period T is proportional to r^3/2 (Kepler's 3rd law), but I am still unsure how to relate the two planets using this concept.

In the figure the blue planet has a period of 1 year and an average distance from the sun of 1.73 x 1011 meters. If the average distance from the sun for the red planet is 1.39 x 1011 meters, what is its period to the nearest hundredth of a year? So I thought maybe they through in the...

A typical GPS (Global Positioning System) satellite orbits at an altitude of 2.0e7 m. Find the orbital speed of such a satellite in km/s. So we know: Mass of the Earth (M) =5.97e24 Radius of the Earth (R) =6.37e6 G is constant =6.67e-11 I used the equation: Final...

MY MISTAKE: just noticed "Then you need to find your delta x, which you do by multiplying the radians you found in the above by your radians (don't forget to convert cm to m!)" WHEN I SAID MULTIPLYING THE RADIANS YOU FOUND ABOVE BY YOUR RADIANS, I MEANT YOUR RADIUS. sorry.