Toy Store

calculate the actual speed v. From that calculate K for the car and then solve for ω that gives this K for the flywheel. Rotation of Rigid Bodies EXECUTE: (a) vtoy vscale = 9-17 Ltoy Lreal ⎛L ⎞ ⎛ 0.150 m ⎞ vtoy = vscale ⎜ toy ⎟ = (700 km/h) ⎜ ⎟ = 35.0 km/h ⎝ 3.0 m ⎠ ⎝ Lreal ⎠ vtoy = (35.0 km/h)(1000 m/1 km)(1 h/3600 s) = 9.72 m/s (b) K = 12 mv 2 = 12 (0.180 kg)(9.72 m/s)2 = 8.50 J (c) K = 12 I ω 2 gives that ω = 9.69. 2K 2(8.50 J) = = 652…