4 As a skier descends a slope, her kinetic energy increases from 600 J to 3 200 J while her gravitational potential energy decreases by 5 900 J. How much heat energy is created due to friction? A. 2 100 J A B. 3 300 J C. 8 500 J D. 9 700 J 5 Calculate the minimum power of a cyclist who can increase his kinetic energy from 480 J to 2 430 J by travelling 26 m in 4.0 s. A. 75 W B. 3.6x102 W T C. 4.9x 102 W D. 7.3x102 W 6 Rene, whose mass is 85 kg, skis down the hill, passing Z with a kinetic energy of 9 700 J. T If friction is ignored, to what maximum height, h, can Rene ski? A. 12 m B. 15 m C. 1.1 x10' m D. 6.6x10' m 7 A cyclist travelling at 10 m/s applies her brakes and stops in 25 m. The graph shows the magnitude of the braking force versus the distance travelled. 160 F(N T/A 15 25 d(m) What is the total mass of bike and cyclist? A. 20 kg B. 40 kg C. 64 kg D. 80 kg 8 The graph below shows the relationship between the force applied and the distance moved for a 3.5 kg object on a frictionless horizontal surface. 16.0 12.0 - F (N) 8.0 K 4.0 2.0 4.0 6.0 8.0 d (m) If the object was initially at rest, what is its kinetic energy after travelling 8.0 m? A. 2.0 J B. 32 J C. 64 J D. 130 J