Comments on: Physics Help Please!? http://antiquerecordplayers.info/physics-help-please.htm Mon, 06 Feb 2012 08:13:29 +0000 http://wordpress.org/?v=2.7.1 hourly 1 By: DH http://antiquerecordplayers.info/physics-help-please.htm/comment-page-1#comment-4397 DH Sat, 13 Mar 2010 12:21:26 +0000 http://antiquerecordplayers.info/physics-help-please.htm#comment-4397 2a) 45rpm*1min/60s = 0.75 rev/s b) In t = 5s we have 0.75rev/s*5s = 3.75 rev 6. α = Δω/Δt = (3 rev/s - 6 rev/s) /12s = -0.25 rev/s^2 8a) τ = F*r = 50N*0.24m = 12 N-m b) Now τ = F*r = 50N*0.12m = 6 N-m 12. α = τ /I = 60N-m/12.0 kg-m^2 = 5 rad/s^2 2a) 45rpm*1min/60s = 0.75 rev/s

b) In t = 5s we have 0.75rev/s*5s = 3.75 rev

6. α = Δω/Δt = (3 rev/s - 6 rev/s) /12s = -0.25 rev/s^2

8a) τ = F*r = 50N*0.24m = 12 N-m

b) Now τ = F*r = 50N*0.12m = 6 N-m

12. α = τ /I = 60N-m/12.0 kg-m^2 = 5 rad/s^2

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