5. An eclectrical motor spins at a constant 2857.0 rev/min. If the armature radius is 2.685 cm, what is the acceleration of the outer edge of the armature? 6. A satellite orbits the earth a distance of 1.50 x 107 m above the planet's surface and takes 8.65 hours for each revolution about the earth. The earth's radius is 6.38 x 106 m. The acceleration of this satellite is closest to 7. A long-distance swimmer is able to swim through still water at 4.0 km/h. She wishes to try to swim from Port Angeles, Washington, directly north to Victoria, British Columbia, a distance of 50 km. An ocean current flows through the Strait of Juan de Fuca from west to east at 3.0 km/h. In what direction (relative to north) should she swim to make the crossing along a straight line between the two cities? Chapter 5 8. A child on a sled starts from rest at the top of a 15 slope. If the trip to the bottom takes 15.2 s how long is the slope? Assume that frictional forces may be neglected. 9. The figure shows two forces, each of magnitude 4.6 N, acting on an object. The angle between these forces is 40, and they make equal angles above and below the horizontal. What third force will cause the object to be in equilibrium (acceleration equals zero)? F