Press (fn) F 7. [-/3 Points] DETAILS OSUNIPHYS1 7.1. WA.008. A force Fy shown in the figure below acts or owing initial to final positions. (a ) from y = A toy = B b) from y = B to y = C (c) from y = A to y = C Additional Materials Ga Reading 8. [-/2 Points] DETAILS OSUNIPHYS1 7.2.WA.014. An athlete with a mass of 60.5 kg is in a cross country race, and at one instant he has a speed of 3.60 m/s. (a) What is his kinetic energy at this instant? K , = (b) If he wishes to doubles his speed to reach the finish line, his kinetic energy will change by what factor? Additional Materials Reading 9. [-/2 Points] DETAILS OSUNIPHYS1 7.3.P.060. A 4.0 kg block starts with a speed of 18 m/'s at th ing friction between the block and plane is # k = 0.32. a) Use the work-energy principle to deter (in m) the blo coming to rest. m (b) After stopping, the block slides back down the plane. What is its speed (In m/s) when it es the bottom? (Hint: For the round trip, only the force of friction does work on the block.) m/'s Additional Materials Reading 10. [0/2 Points] DETAILS PREVIOUS ANSWERS OSUNIPHYS1 7.3.P.062. A small block of mass 150 g starts at rest at A, slides to B where its speed is Vg = 7.0 m/s, then slides along the horizontal surface a distance 16 m before coming to rest at C. (See below.) 4.0 m -16 m- a) What is the work of friction along the curved surface (in J)? (b) What is the coefficient of kinetic friction along the horizontal surface? HK = 3.67 Additional Materials Ba Reading 11. [-/1 Points] DETAILS OSUNIPHYS1 7.3.P.064. When released from rest, a 160 g block slides down the path shown below, reaching the bottom with a speed of 4.4 m/s. How much work does the force of friction do (in J)? 4.4 m/s Additional Materials Reading