Contoh Soal:10. (II) A 380-kg piano slides 2.9 m down a 25° incline and iskept from accelerating by a man who is pushing back onit parallel to the incline (Fig. 6-36). Determine: (a) theforce exerted by the man, (b) the work done on the pianoby the man, (c) the work done on the piano by the force ofgravity, and (d) the net work done on the piano. Ignorefriction.mgFIGURE 6-36Problem 10.Contoh Soal:21. (II) An 85-g arrow is fired from a bow whose string exertsan average force of 105 N on the arrow over a distance of75 cm. What is the speed of the arrow as it leaves the bow? Contoh SoalA frictionless roller-coaster is given a maximum possible initial speed vo = 6 m/swhen it is at height y. = 6m above the ground and moves freely afterwards, seeFig. 6.14 and take g = 10 m/s. (a) What will be the roller-coaster's speed whenit reaches the lowest point at y = 4 m? (b) What will be its maximum height y2?Fig. 6.14Contoh SoalA block of initial speed v, slides across a floor, see Fig. 6.15. A kinetic fric-tional force of magnitude f = 50N does work on the block, stopping it over adisplacement of magnitude d = 2m. Find the dissipated mechanical energy.Fig. 6.15MotionContoh SoalTwo forces Fi and F2 are acting on a box that slides horizontally to the right acrossa frictionless surface, see Fig. 6.21. Force F has a magnitude of 5 N and makesan angle e = 60° with the horizontal. Force F, is against the motion and has amagnitude of 2 N. The speed v of the box at a certain instant is 4 m/s. What is thepower due to each force that acts on the box at that instant, and what is the netpower? Is the net power changing with time?Fig. 6.21Motionmg

Name: Contoh Soal:10. (II) A 380-kg piano slides 2.9 m down a 25° incline a
Uploaded: 2024-03-20T06:57:25.000Z
Channel: Bartleby
Description: Contoh Soal:10. (II) A 380-kg piano slides 2.9 m down a 25° incline and iskept from accelerating by a man who is pushing back onit parallel to the incline (Fig. 6-36). Determine: (a) theforce exerted by the man, (b) the work done on the pianoby the