Awesome, I figured it out. I used (2)*(number of particles)*(mass)*(velocity)/(Area). They only gave a formula for the 3-D volume in my book. Thanks for the help!
I can't see how the volume is wrong though. 20cm^2/100^2= 0.002m^2. Another person who attempted the problem was using the same value for the volume as me. I've got the concept of elastic and inelastic collisions down. I learned it in my first calc. based physics class. More help would be...
Homework Statement
4.60×1023 nitrogen molecules collide with a 20.0cm^2 wall each second. Assume that the molecules all travel with a speed of 450m/s and strike the wall head on.
What is the pressure on the wall in pascals (Pa)?
Homework Equations
p=(1/3)*(N/V)*(m*v_rms^2)
where...
Homework Statement
The figure
shows a neutron in a one-dimensional box. If the right end of the box is opened, the neutron travels out of the box, impinges on a double slit, and is detected 2.0 m behind the double slit. Repeating the experiment over and over produces the fringe pattern shown...
Homework Statement
X rays with wavelength 0.10 nm are incident on a crystal with a hexagonal crystal structure. The x-ray diffraction spectrum is shown in the figure.
Figure:
What is the atomic spacing D of this crystal? (in nanometers)
Homework Equations
The Bragg...
I did f*(n-1) = R even before you mentioned the equation in that form. Maybe the masteringphysics website is off. I derived that formula by taking s=f and s' being equal to inifinity for an answer of 1.02cm (we are on the same boat). Yes, it is focusing into a medium with an index of 1. This...
I guess you could approach it from the lens makers... I don't see how though. I'm given only one radius... in your formula that needs to be a R subnot 1 and 2. Also, I'm dealing with two index of refraction values. With the amount of known values I have I cannot seem to piece them together into...
Are you implying that it is 2*f=R? 6.0cm is not the right answer if so. That only applies for mirrors right? They seem to be indicating the "air" and the "aqueous humor" in the problem... both of which have given index of refractions in the book. I believe the equation used to solve this problem...
Homework Statement
The cornea, a boundary between the air and the aqueous humor, has a 3.0cm focal length when acting alone.
What is its radius of curvature?
Homework Equations
n(1)/s + n(2)/s' = (n(2)-n(1))/R
where, n is the index of refraction (unitless), s' is the img dist (cm)...
I ended up solving it differently by finding t_1, t_2, t_3, and then by adding all of the times for the time overall. Woot extra credit for me. Thanks for the help. Time for the test tomorrow. :smile:
A scale drawing is simply a drawing of the real object however it is reduced in size and put on paper. You can use parameters such as making every line on your paper equal to one inch even though realistically the space between a line on your paper is not an inch. I would use graph paper if...
Homework Statement
Consider a string of total length L, made up of three segments of equal length. The mass per unit length of the first segment is mu, that of the second is 2*mu, and that of the third mu/4. The third segment is tied to a wall, and the string is stretched by a force of...
Wow, thanks for the figure. My online homework still said that the answer of 160cm was still the wrong answer. I believe it is because we need to consider the thin lens equation after finding the obj and img distance. I cannot see how you are getting the focal length to be 160cm? I'd be happy if...
Homework Statement
Mastering physics problem 23.76 difficulty rating: two bars=difficult
A 2.0-cm-tall object is placed in front of a mirror. A 1.0-cm-tall upright image is formed behind the mirror, 180cm from the object.
What is the focal length of the mirror?
Homework Equations...