Chapter 7: Q. 17 (page 177)
What is the tension in the rope of FIGURE EX7.17?
The tension in the rope
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A rope hangs from the ceiling. What is the tension at the midpoint of the rope?
FIGURE Pshows two strong magnets on opposite sides of a small table. The long-range attractive force between the magnets keeps the lower magnet in place.
a. Draw an interaction diagram and draw free-body diagrams for both magnets and the table. Use dashed lines to connect the members of an action/reaction pair.
b. The lower magnet is being pulled upward against the bottom of the table. Suppose that each magnet’s weight is and that the magnetic force of the lower magnet on the upper magnet is . How hard does the lower magnet push against the table?
Problems 51 and 52 show the free-body diagrams of two interacting systems. For each of these, you are to
a. Write a realistic problem for which these are the correct freebody diagrams. Be sure that the answer your problem requests is consistent with the diagrams shown.
b. Finish the solution of the problem.
A woman living in a third-story apartment is moving out. Rather than carrying everything down the stairs, she decides to pack her belongings into crates, attach a frictionless pulley to her balcony railing, and lower the crates by rope. How hard must she pull on the horizontal end of the rope to lower a crate at steady speed?
The lower block in FIGURE CP7.53 is pulled on by a rope with a tension force of 20 N. The coefficient of kinetic friction between the lower block and the surface is 0.30. The coefficient of kinetic friction between the lower block and the upper block is also 0.30.
What is the acceleration of the 2.0 kg block?
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