11_P53InstructorSolution

11_P53InstructorSolution - 11.53. Model: Use the particle...

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
11.53. Model: Use the particle model for the ice skater, the model of kinetic/static friction, and the work- kinetic energy theorem. Visualize: Solve: (a) The work-kinetic energy theorem is 22 10 n e t w i n d 11 Km v m v WW Δ= = = There is no kinetic friction along her direction of motion. Static friction acts to prevent her skates from slipping sideways on the ice, but this force is perpendicular to the motion and does not contribute to a change in thermal energy. The angle between wind F G and r Δ G is 135 , θ = ° so wind wind wind cos135 (4 N)(100 m)cos135 282.8 J WFr F y =⋅ Δ ° = ° = G G Thus, her final speed is
Background image of page 1
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 12/10/2011 for the course PHYS 1211 taught by Professor Geller during the Fall '09 term at University of Georgia Athens.

Ask a homework question - tutors are online