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 Jun 1st 2008, 11:03 AM #1 Junior Member   Join Date: Jun 2008 Posts: 2 Physics homework I attached the file, its 4 questions , easy (its a pdf file) but i have 4 other exams and i dont have much time to solve it, please someone help, i am bad at physics, and i need help, thank u. Attached Thumbnails
 Jun 1st 2008, 11:07 AM #2 Forum Admin     Join Date: Apr 2008 Location: On the dance floor, baby! Posts: 2,403 Problem 1. a) What is the definition of average angular acceleration? b) The instantaneous angular acceleration is the slope of the curve at a given time. Your "curve" in this case is a straight line. How do you determine the slope of a line? c) The angular displacement may be found from the time - angular velocity graph as the area under the curve for a given time limit. d) You know the angular displacement from c). How do you convert an angle in radians to a number of revolutions? -Dan __________________ Do not meddle in the affairs of dragons for you are crunchy and taste good with ketchup. See the forum rules here.
 Jun 1st 2008, 11:11 AM #3 Forum Admin     Join Date: Apr 2008 Location: On the dance floor, baby! Posts: 2,403 Problem 2. I need some clarification on the angular displacement formula. Is it supposed to be $\displaystyle \theta = 3 - 2t$ or $\displaystyle \theta = 3 - 2t^3$? In either case a) The average angular acceleration is given by $\displaystyle \bar{\alpha} = \frac{\omega - \omega_0}{t}$ How do you find the angular velocity if you know the angular displacement? b) The angular acceleration here (without the word "average") means the instantaneous angular acceleration. How do you find the angular acceleration from the angular velocity you used in part a)? I'll help out with the rest later. Give these two a try and if you still have questions about them, go ahead and post. -Dan __________________ Do not meddle in the affairs of dragons for you are crunchy and taste good with ketchup. See the forum rules here.
 Jun 1st 2008, 01:50 PM #4 Junior Member   Join Date: Jun 2008 Posts: 2 Well its  = 3 - 2t its =3 - 2t Yeah thanks but i still dont get in it , i just want the formulas and the solutions so i can hand it in, im weak at physics so im focusing on my other subjects. this is a homework that i need to hand in. but thanks anyway
Jun 1st 2008, 04:34 PM   #5

Join Date: Apr 2008
Location: On the dance floor, baby!
Posts: 2,403
 Originally Posted by dragonpower its =3 - 2t Yeah thanks but i still dont get in it , i just want the formulas and the solutions so i can hand it in, im weak at physics so im focusing on my other subjects. this is a homework that i need to hand in. but thanks anyway
Do I even need to make my next comment then?

-Dan
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