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  1. D

    Atwood's machine with a cylinder

    Homework Statement a massless string of negligible thickness is wrapped around a uniform cylinder of mass m and raidus r. the string passes up over a massless pulley and is tied to a block of mass m at its other end. the system is released from rest. what are the accelerations of the block...
  2. D

    Fourier transforms

    would i take the integral of each function squared and the square root of that?
  3. D

    Fourier transforms

    okay i did know that, but i don't know how to find the root mean square of each waveform. the problem is in my lack of knowledge of statistics it seems...
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    Fourier transforms

    Homework Statement 3. Consider the narrow triangular voltage pulse V(t) shown in the figure. i can't paste the function but its a piecewise function of the form: V(t)={1+(1/a)t from -a <=t<=0 {1-(1/a)t from 0<t<=a { 0 otherwise (a) Find and sketch the spectral content...
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    Motion with Constant Acceleration (True/False)

    dude don't worry at least you gave it alot more thought then some people would have. just remember with vector quantities like accelaration and displacement and velocity, direction matters.
  6. D

    Speed when swinging from a rope?

    the angle has nothing to do with the energy, only in finding the height.
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    Motion with Constant Acceleration (True/False)

    1) acceleration is (m/s)/s which means it is changing by a certain velocity each second. 2) acceleration is a vector quantity, direction matters 3) same as question one, velocity changes by a certain amount each second. 4) your right exactly 5) position could also be changing negatively, it...
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    Speed when swinging from a rope?

    A)1/2 mv^2 = mgh potential energy at the top = kinetic energy at the bottom of the pendulum. B)1/2mv^2 + mgh = 1/2 mv^2 initial kinetic energy plus potential energy at the top = final kinetic energy at the bottom.
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    Velocity When a Runner Covers Half a Lap

    haha. well apparently i cant read.
  10. D

    Buoyancy of sphere in water

    yeah i can't think of anything that i'm doing wrong, it just seems really weird that the mass would be so high. when i worked out the density of the ball it was lower than that of water so it should float it just seems weird thinking about something that heavy floating.
  11. D

    Two very short questions.

    smaller cross sectional area=less mass of water you are hitting with the same force.
  12. D

    Buoyancy of sphere in water

    Homework Statement A hollow plastic sphere is held below the surface of a fresh water lake by a cord anchored to the bottom of the lake. The sphere has a volume of 0.65 m^3 and the tension in the cord is 842 N. What is the mass of the sphere, in kg? Enter your answer using 3 decimal places...
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    Velocity When a Runner Covers Half a Lap

    the runner ends in the same place he/she starts.
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    Physics 12 Journal help, please!

    1. centrifugal force is outward force associated with rotation, how the outward force would effect the water molecules 3. think about Newtons second law F=ma, which is can be arranged to a=F/m. does a proton or newtron have greater mass? 4. i don't know what the oscillation equations are off...
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    Determine the length of the third segment

    Homework Statement A thin uniform metal rod is bent into three perpendicular segments, two of which have length L = 4.67 m. Determine the length of the third segment such that the unit will hang with two segments horizontal when it is supported by a hook as shown in the figure. Homework...
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