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Chapter 7: Q. 28 (page 178)
A rope of lengthL and mass m is suspended from the ceiling. Find an expression for the tension in the rope at position y, measured upward from the free end of the rope.
The tension in the rope at positiony, measured upward from the free end is.
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A mosquito collides head-on with a car traveling Is the magnitude of the mosquito’s acceleration larger than, smaller than, or equal to the magnitude of the car’s acceleration? Explain.
The coefficient of static friction is between the two blocks in FIGURE . The coefficient of kinetic friction between the lower block and the floor is . Forcecauses both blocks to cross a distance of , starting from rest. What is the least amount of time in which this motion can be completed without the top block sliding on the lower block?
In case a, in the figure block A is accelerated across a frictionless table by a hanging weight . In case b, block A is accelerated across a frictionless table by a steady tension in the string. The string is massless, and the pulley is massless and frictionless. Is A’s acceleration in case b greater than, less than, or equal to its acceleration in case a? Explain.
A very smart -year-old child is given a wagon for her birthday. She refuses to use it. “After all,” she says, “Newton’s third law says that no matter how hard I pull, the wagon will exert an equal but opposite force on me. So I will never be able to get it to move forward.” What would you say to her in reply?
A box is on a frictionless slope and is connected via a massless string over a massless, frictionless pulley to a hanging weight. The picture for this situation is similar to FIGURE P.
a. What is the tension in the string if the box is held in place, so that it cannot move?
b. If the box is then released, which way will it move on the slope?
c. What is the tension in the string once the box begins to move?
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