1. Physics and Astronomy Outreach Program at the University of British Columbia Renewable And Clean Energy Wind Turbines Multiple-Choice Questions

2. Physics and Astronomy Outreach Program at the University of British Columbia Physics and Astronomy Outreach Program at the University of British Columbia What is the kinetic energy of 1 cubic meter of air moving at the speed of 10 m/s? The density of air is 1.2 kg/m 3. A. 12 J B. 120 J C. 60 J D. 6 J Wind Turbines

3. Physics and Astronomy Outreach Program at the University of British Columbia Physics and Astronomy Outreach Program at the University of British Columbia What is the kinetic energy of 1 cubic meter of air moving at the speed of 10 m/s? The density of air is 1.2 kg/m 3. A. 12 J B. 120 J C. 60 J D. 6 J Wind Turbines

4. Physics and Astronomy Outreach Program at the University of British Columbia Physics and Astronomy Outreach Program at the University of British Columbia Kinetic Energy = ½mv 2 = ½Vρv 2 = ½ · 1 m 3 · 1.2 kg/m 3 · (10 m/s) 2 = 60 J Wind Turbines

5. Physics and Astronomy Outreach Program at the University of British Columbia Physics and Astronomy Outreach Program at the University of British Columbia The map shows Canada’s average wind speeds (in m/s). We see the highest wind speeds of 10.5 m/s on the East Coast and 9.0 m/s on the BC coast. How much more wind power is available on the East Coast compared to the BC coast? A. 15% more B. 17% more C. 36% more D. 59% more E. Almost twice as much Wind Turbines

6. Physics and Astronomy Outreach Program at the University of British Columbia Physics and Astronomy Outreach Program at the University of British Columbia The map shows Canada’s average wind speeds (in m/s). We see the highest wind speeds of 10.5 m/s on the East Coast and 9.0 m/s on the BC coast. How much more wind power is available on the East Coast compared to the BC coast? A. 15% more B. 17% more C. 36% more D. 59% more E. Almost twice as much Wind Turbines

7. Physics and Astronomy Outreach Program at the University of British Columbia Physics and Astronomy Outreach Program at the University of British Columbia We know that wind power = ½rAv 3 So P East = ½rA(v East ) 3 and P BC = ½rA(v BC ) 3 The difference between these two is: = P East P BC = ½rA(v East ) 3 ½rA(v BC ) 3 = (v East ) 3 (v BC ) 3 = (10.5 m/s) 3 = 1.36 (9 m/s) 3 Wind Turbines

8. Physics and Astronomy Outreach Program at the University of British Columbia Physics and Astronomy Outreach Program at the University of British Columbia 1. Siemens Energy and Automation, Inc. Wind Turbine (online). http://www2.sea.siemens.com/NR/rdonlyres/1F91AFE0-BB27-4D13- 91F7-153AEA0D6C98/0/WindTurbine.jpg [9 June 2009]. http://www2.sea.siemens.com/NR/rdonlyres/1F91AFE0-BB27-4D13- 91F7-153AEA0D6C98/0/WindTurbine.jpg Wind Turbines