Okay I have been racking my brain with this one for over a week and still have no clue how to do this.I need to study this for a test I am having and can't seem to figure this out Consider an arbitrary 3D vector: A=Axx+Ayy+Azz a) Determine the direction cosines for this vector. These are cos[], cos[] and cos
Two planes leave simultaneously from the same airport, one flying due north and the other flying due east. The north bound plane is flying 50 miles per hour faster than the east bound plane. After 3 hours the planes are 2,440 miles apart. Find the speed of each plane. I made a guess at it because I really don't know how to figu
A double pendulum consists of a pendulum of mass m2 hanging from a pendulum of mass m1. The motion of both parts of the double pendulum is constrained to the x-y plane. Both strings are "unstretchable" and having length I2 and I1, respectively. a) How many degrees of freedom does this system have? Using the variable theta1
If |0> and |1> denote the two eigenstates of N corresponding to the eigenvalues 0 and 1, respectively, show that câ? |0> = |1> and c |0> = 0
An undoped Si sample is optically excited at 300K such that Gop=10^19 ehp/cm^3s and taun=taup=1 microseconds. (a) What is the separation of the quasi Fermi levels (Efn-Efp)? (b) Where is Efn and Efp with respect to the intrinsic Fermi level Ei? (c) What is the change in conductivity due to excess carriers? What are the a
Find the center of mass of a system of three particles of mass 2 kg, 3kg and 4 kg placed at the corners of an equilateral triangle of side 2 meters.
Three point masses are located in an x,y plane as follows: M1= 7 kg, at (x1, y1)= (5, 6); M2= 8 kg, at (x2, y2)= (-4, 6); and M3= 9 kg, at (x3, y3)= (3, -2). Find the coordinates (xcm, ycm) of the c.m. of the system.
A girl delivering newspapers travels three blocks west, four blocks north, then six blocks east. B. What is the total distance she travels?
A wire of density 9gm/cm^3 is stretched between two clamps 100cm apart subjected to an extension of 0.05 cm. What is the lowest frequency of transverse vibrations in the wire, assuming the Young's modulus to be 9x10^11 dynes/cm^ ?
The displacement (in meters) of a wave is y= 0.26 sin (pi *t-3.7 pi *x), where t is in seconds and x is in meters. (a) Is the wave traveling in the +x or -x direction? (b) What is the displacement y when t= 38 seconds and x= 13 meters?
Determine the position of the center of mass of a thin parabolical shell defined by z = a^2 - r^2 in cylindrical polar coordinates, glued to a flat bottom where z = 0, r < a of the same thickness.
Asking problem: Divide the parabolic spandrel shown into five vertical sections and determinate by approximate means the x coordinate of its centroids; approximate the spandrel by rectangles of the form bdd'b'. Note: The drawing file is in word97 format for PC and not for MAC. My question is how can I determine the area of
The asking problem: Show that when the distance h is selected to maximize the distance Y from line BB' to the centroid of the shaded area, we also have Y=h. Note: The Y is relating to the centroid Y of the area. The drawing is in word97 format for PC and not for MAC. My problem is I don't know how can I demonstrate this. Ca
Three problems for practice. View the pdf file below for additional clarity. a) x^5 upper limit 1, lower limit 0 b) 3x^2 upper limit 2, lower limit 1 c) x^n upper limit 1, lower limit 0
Various questions to practice with integration. Integrate the following; a) x^6 b) 3x + x^2 c) 1/(x^2) d) ax + b e) x^p + x^q View the pdf file for the best clarity.