# Search results

1. ### 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. ### Fourier transforms

would i take the integral of each function squared and the square root of that?
3. ### 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...
4. ### 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...
5. ### Speed when swinging from a rope?

really basic trig.
6. ### 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.
7. ### Speed when swinging from a rope?

the angle has nothing to do with the energy, only in finding the height.
8. ### 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...
9. ### 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.
10. ### Velocity When a Runner Covers Half a Lap

haha. well apparently i cant read.
11. ### 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.
12. ### Two very short questions.

smaller cross sectional area=less mass of water you are hitting with the same force.
13. ### 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...
14. ### Velocity When a Runner Covers Half a Lap

the runner ends in the same place he/she starts.
15. ### 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...
16. ### 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...