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quest4_pdf - truong(ajt2287 HW4 Force II...

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truong (ajt2287) – HW4 - Force II – hester – (WVPHYSICSC2011) 1 This print-out should have 11 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001(part1of2)10.0points An amusement park ride consists of a rotating circular platform 9 . 87 m in diameter from which 10 kg seats are suspended at the end of 2 . 59 m massless chains. When the system rotates, the chains make an angle of 39 . 3 with the vertical. The acceleration of gravity is 9 . 8 m / s 2 . θ l d What is the speed of each seat? Answer in units of m / s 002(part2of2)10.0points If a child of mass 50 . 9 kg sits in a seat, what is the tension in the chain (for the same angle)? Answer in units of N 003(part1of2)10.0points (The normal force is perpendicular to the sup- porting surface.) m g ? The magnitude of the normal force on a block sliding down to a friction-free inclined plane 1. may be greater than mg . 2. is equal to mg . 3. is less than mg , always. 4. is greater than mg , always.
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