Recent content by keylostman

so i take 5.4-2.7 ti get 2.7 m/s and multiply by .34m the radius to get .918 rad/s ?

Homework Statement A car engine accerlates from 1080rpm to 4800rpm in 12.5 seconds. Calculate the angular accleration, assumed constant, and the total number of revolutions the engine makes in this time The Attempt at a Solution angular acceleration (a) = (wf - wi) /(tf - ti) (a)...

ok for speed of axle i took .5 * 5.4 to get 2.7m/s and for angular speed of wheel i took 5.4mn/s * .34m to get 15.9 rad/s am i correct ?

W = (1/2) (.88)(25.13)^2 - (1/2)(2.3)(9.42)^2 W =((1 / 2) * .88 * (25.13^2)) - ((1 / 2) * 2.3 * (9.42^2)) = W= 175.820576 joules this is what i did, and i believe it rights, makes sense

so its then .5 * .88 * (4.0 * 2pi) ?

Homework Statement A wheel of diameter of .68m roll without slipping. A point at the top of the wheel moves witha tangential speed of 5.4m/s. Whaat speed is the axle of the wheel moving? What is the angular speed of the wheel? How would i approach to do this problem, what equations would...

1/2IW^2 ? I thought Work done would be final work - intital work,

Now you see the torture i go through to understand problems lol. All his questions are worded badly, must be cause he is from another Country heh

I2W2-I1W1, where W is squared? This equation i use correct ?

A ballerian spins initially at 1.5rev/s when arms are extended. She then draws in her arms to her body and her moment of intertia is .88kg m^2 and her angular speed increases to 4.0rev/s. Determine the network she did to increase her angular speed? To find moment of inertia was pretty simple...

For angular velocity, i don't know the time, the time is implied toward the 2nd part of question

Yes Doc, its correct. THe problem is copied right

i meant the angular velocity, i wanted to find, how would i find it ?

A wheel turns with a moment of intertia of 16.0kg m^2 and has 10m N applied to it. if it starts from rest calculate the angular velocity. Also what is the kinetic energy 10seconds later? The wheels angular velocity i used T=IA, and solved for Angular velocity solving for a i got...