Estimate the magnitude of the normal force acting on an apple that rests on a flat surface. Estimate the magnitude of the normal force on the apple when the surface is tilted at an angle of 29∘ with respect to the horizontal.
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- Jamal and Dayo are lifting a large chest, weighing 207 lb, by using the two rope handles attached to either side. As they lift and hold it up so that it is motionless, each handle makes a different angle with respect to the vertical side of the chest (Fig. P5.76). If the angle between Jamals handle and the vertical side is 25.0 and the angle between Dayos handle and the vertical side of the chest is 30.0, what are the tensions in each handle? FIGURE P5.76A persons head is bent over her book. The head weighs P=37.2 N and is supported by the muscle force F m exerted by the neck extensor muscles and by the contact force F c exerted at the atlantooccipital joint. Given that the magnitude of F m is 60.0 N and is directed 35.0 degree below the horizontal. Find the magnitude of the contact force F c.In about 1915, Henry Sincosky of Philadelphia suspended himself from a rafter by gripping the rafter with the thumb of each hand on one side and the fingers on the other side (see the figure). Sincosky's mass was 79.0 kg. If the coefficient of static friction between hand and rafter was 0.720, what was the least magnitude of the normal force on the rafter from each thumb or opposite fingers?
- A 0.237 kg book rests at an angle against one side of a bookshelf. The magnitude and direction of the total force exerted on the book by the left side of the bookshelf are given by |FL|=1.01 θL=63.0° What must the magnitude |FB| and direction θB of the total force exerted on the book by the bottom of the bookshelf be in order for the book to remain in this position?A 0.237 kg book rests at an angle against one side of a bookshelf. The magnitude and direction of the total force exerted on the book by the left side of the bookshelf are given by |FL| = 1.01N θL=63.0° What must the magnitude |FB| and direction θB of the total force exerted on the book by the bottom of the bookshelf be in order for the book to remain in this position?When a surface is horizontal and only gravity acts on an object, the normal force exerted by the surface is equal to ___________________________. On an inclined surface, when is the normal force equal to zero? ______________________________________ _________________________________________________________________________________________
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- One end of a uniform meter stick is placed against a vertical wall. The other end is held by a lightweight cord that makes an angle ? with the stick. The coefficient of static friction between the end of the meter stick and the wall is 0.400. When theta = 15.0o , how large must the coefficient of static friction be so that the block can be attached 0.100 [m] from the left end of the stick without causing it to slip?In about 1915, Henry Sincosky of Philadelphia suspended himself from a rafter by gripping the rafter with the thumb of each hand on one side and the fingers on the opposite side. Sincosky’s mass was 79 kg. If the coefficient of static friction between hand and rafter was 0.70, what was the least magnitude of the normal force on the rafter from each thumb or opposite fingers? (After suspending himself, Sincosky chinned himself on the rafter and then moved hand-over-hand along the rafter. If you do not think Sincosky’s grip was remarkable, try to repeat his stunt.)A 1,175 N dowel is held in place by a light cord at an angle ? = 31.0° to the horizontal as shown in the figure. The dowel is attached to a pivot at the bottom, and a mass of weight w = 2,100 N hangs from its top. The dowel makes an angle of ? = 59.0° with the horizontal. Assume the dowel is uniform. Find the tension in the supporting cord (in kN). kN (b) Find the components of the reaction force (in kN) exerted by the floor on the dowel. horizontal component:magnitude kNdirection vertical component:magnitude kNdirection
