Help - To protect his food from hungry bears, a boy scout raises his food pack with a rope that is thrown over a tree limb at height h above his hands. He walks away from the vertical rope with a constant velocity,vboy, holding the free end of the rope in his hands. a) Show that the speed v of the food pack is given by x(x^2+h^2)^(-1/2) vboy where x is the distance he has walked away from the ver...

Cam mechanisms - Cam mechanisms are used in many machines. For example, cams open and close the valves in your car engine to admit gasoline vapor to each cylinder and to allow the escape of exhaustThe sliding wedge duplicates the function of a rotating eccentric disk on a camshaft of your car. Assume there is no friction between the wedge and the base, between the pushrod and the wedge, or between...

A particle moves along a line where the potential energy of its system depends on its position r... - 8. [SerPOP4 7.P.040.] A particle moves along a line where the potential energy of its system depends on its position r, as graphed in Figure P7.40. In the limit as r increases without bound, U(r) approaches +1 J. (Some questions in here that I already asnwered) Now suppose the particle has...

Vectors - #1 The vectors 42.0cm at 15.0 degrees and 23.0 cm at 65.0 degrees both start from the origin. Both angles are measured counterclockwise from the x-axis. The vector's form two sides of a parallelogram. (a) find the area of the parallelogram. (b) Find the length of its longer diagonal. #2. The wind exerts on a flower the force 0.785 N horizontally to the east. The stem of the flower is 0...

Rotational Forces - 6. [SerPOP4 10.P.050.] A space station shaped like a giant wheel has a radius of 105 m and a moment of inertia of 5.03 108 kgm2. A crew of 150 are living on the rim, and the station's rotation causes the crew to experience an apparent free-fall acceleration of g (Fig. P10.44). When 100 people move to the center of the station for a union meeting, the angular speed changes. A...