The problem asks me to show that the addition of two cosines with different wavelength and frequencies gives a solution with beats.
Mathematically, I need to verify that A cos (k1x-w1t)+A cos (k2x-w2t) is equivalent to A cos (.5(k1+k2)x-.5(w1+w2)t) cos (.5(k1-k2)x-.5(w1-w2)t)
I converted...
Here's the problem:
A damped oscillator has a mass of .05 kg, a spring constant of 5 N/m, and a damping constant of .4 Ns/m. At t=0, the mass is moving at 3.0 m/s at x=.1m. Find x as a function of time.
What I have done:
I know the damping constant b = .4 and I have used this to find...
I get an answer of 2bL (1- x^2/a^2). This does not seem correct to me, since it contains an x^2 term? Is this right? Is there a substitution I can make for x? x=a or x=L, for instance? This problem is driving me crazy...any help greatly appreciated!
So, for the first segment, dr = dyj. For the second segment, dr = dx i.
For the third segment, dr = -dyj. For the fourth segment, dr = -dx i. Is this correct? Are the limits on my integration correct as well?
Also, should the answer be 0 (closed path, conservative force...not sure if...
I am asked to calculate the work done by a force as it moves around a path. The force is F = b(1-x^2/a^2)j. The path is a rectangle with coordinates at (0,0); (0,L); (a,L); (a,0). The force moves clockwise around the path beginning at the origin. A diagram is attached.
I know work is...
Thanks for being so prompt and helpful in your response!
So, constrained to move in a circle...that sounds like polar coordinates!
So the third term I am missing is the expression of kinetic energy for the disc in polar coordinates?
So I should find the center of mass of the disk, and that...
Thanks so much for the help...but I need some further clarification.
You said that the contribution to KE comes from the fact that the disk's center of mass can move. How do I express this mathematically as a term in my kinetic energy expression? Is what I have for Kinetic energy thus far...
Lagrange Problem redux -- super urgent...
See the attachment to help you visualize this.
A rod of length L and mass m is povoted at the origin and swings in the vertical plane. The other end of the rod is attached/pivoted to the center of a thin disk of mass m and radius r.
OK, I know that...
We have a rod of length L and mass M pivoted at a point at the origin. This rod can swing in the vertical plane. The other end of the rod is pivoted to the center of a thin disk of mass M and radius R. Derive the equations of motion for the system.
I have attached a drawing :)
If you...
The system examined in the problem is depicted below:
^^^^^(m1)^^^^^(m2)
m1 and m2 are connected by a spring and m1 is connected to the wall by a spring. The spring constant is k.
T = m/2 [ x1'^2 +x2'^2 ] kinetic energy of system (x1' is velocity of m1, x2' is velocity of m2)
U = 1/2 m...
The problem I am working on asks me to find the curve on the surface z=x^(3/2) which minimizes arc length and connects the points (0,0,0) and (1,1,1).
Here's what I did:
Integral [sqrt(dx^2+dy^2+dz^2)]
Integral [dx sqrt (1+(dy/dx)^2 +(dz/dx)^2]
Integral [dx sqrt (1 + (dy/dx)^2 + 9x/4)]...
Lagrangian Dynamics problem -- need help with setup
Here's the problem:
A simple pendulum of length b and bob with mass m is attached to a massless support moving horizontally with constant acceleration a. Determine the equations of motion.
For the pendulum, x = b sin theta and y = b cos...
Please help with this! Harmonic Motion
Two masses m1=100 g and m2=100 g slide freely in a horizontal frictionless track and are connected by a spring whose force constant is k=.5 N/m. Find the frequency of oscillatory motion for this system. I know omega = sqrt (k/m), but I have two masses...
Two masses m1=100g and m2=200g slide freely in a horizontal frictionless track and are connected by a spring whoser force constant is k=.5 N/m. Find the frequency of oscillatory motion for this system.
Could someone give me a hint/help me get started on this? What equation(s) should I...
Evaluating indefinite integral -- toughie!
I have the velocity function v(x) = [(k*x^2)/(2*m)] + v0
I need to integrate this to get position as a function of time.
So v = dx/dt.
Separating variables, I get t = Integral [2m/(2mv0 + kx^2)]
Here's where I'm stuck...If i pull out the 2m, then I...
Need urgent help -- projectile motion with air resistance
Consider a projectile fired vertically in a constant gravitational field. For the same inital velocities, compare the times required for the projectile to reach its maximum height (a) for zero resisting force and (b) for a resisting...
Projectile Motion with air resistance -- need urgent help
Consider a projectile fired vertically in a constant gravitational field. For the same inital velocities, compare the times required for the projectile to reach its maximum height (a) for zero resisting force and (b) for a resisting...
Projectile Motion -- need urgent help :)
If a projectile is fired from the origin of the coordinate system with an initial velocity v and in a direction making an angle alpha with the horizontal, calculate the time required for the projectile to cross a line passing thorugh the origin and...
Calculate the average value of the curl of the fluid for a rectangular path 15 cm by 10 cm, as shown in the figure (see file attachment).
Va=(10i + 5j)
Vb = (5i+10j)
Vc= (5i + 10j)
Vd = (10i + 5j)
Could someone help me to get started with this one? Please :smile:
Maybe give me an...
I know that rate of flow is equal to pi*(P1-P2)*R^4/8nL. For blood in the coronary artery, I know the pressure drop, and the radius of the artery. What is the viscosity of blood? I can't find this value anywhere! And what value should I enter for L (distance L along a tube)? Is there an...
Here goes:
A potential customer for an 85000 dollar fire insurance policy possesses a home in an area that according to experience, may sustain a total loss in a given year with probability of .001 and a 50% loss with probability .01. Ignoring all other partial losses, what premium shoud the...
If someone could gtive me a general idea about how to approach these problems, I would be very grateful! Our class time was devoted to derivation rather than application.
1) Find the angle between the surfaces defined by r^2=9 and x+y+z^2=1 at the point (2,-2,1).
2) The height of a hill...
These problems are actually for my classical mechanics class, but they are linear-algebra based. I can construct a transformation matrix, but I have trouble visualizing the rotations, particularly in 3-space. So if someone could help me get a pictorial idea of what's actually happening, then...
Here's my problem:
An ideal gas is allowed to expand freely into an evacuated chamber.
The gas is at a pressure of 5 bar and a temperature of 45 degrees Celsius.
Find the final temperature and pressure of the gas.
Find the entropy produced.
W=0, Q=0, dU=0, and dT=0. So the final temp. is...
The problem is that I only have the temperature and pressure of the entering gas, and no other data.
Any ideas?
Here's the actual problem: An ideal gas is allowed to expand freely into an evacuated chamber. The pressure of the entering gas is 5 bar and it has a temperature of 45 degrees...
For the free expansion of an ideal gas into an evacuated chamber, I know that Work=0 and Q=0. Correct? This implies that the change in internal energy dU also equals 0. Since U depends solely on T, this should mean that the final temperature of the chamber is equal to the temperature of the...