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Chapter 4: Q10. (page 101)
How much tension must a cable withstand if it is used to accelerate a 1200 kg car vertically upward at 0.70 m/s2?
The tension in the cable is 12600 N.
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Two snowcats in Antarctica are towing a housing unit north, as shown in Fig. 4–50. The sum of the forcesandexerted on the unit by the horizontal cables is north, parallel to the line L, andDetermineand the magnitude of.
(a) A box sits at rest on a rough 33° inclined plane. Draw the free-body diagram, showing all the forces acting on the box. (b) How would the diagram change if the box were sliding down the plane? (c) How would it change if the box were sliding up the plane after an initial shove?
Compare the effort (or force) needed to lift a 10 kg object when you are on the moon with the force needed to lift it on the earth. Compare the force needed to throw a 2 kg object horizontally with a given speed on the moon and on the earth.
(a) If,andin Fig. 4–53, determine the acceleration of each block. (b) If initially, it is at rest at 1.250 m from the edge of the table, how long does it take to reach the edge of the table if the system is allowed to move freely? (c) If, how large mustbe if the acceleration of the system is to be kept at?
An object is hanging by a string from your rearview mirror. While you are decelerating at a constant rate from 25 m/s to rest in 6.0 s, (a) what angle does the string make with the vertical, and (b) is it toward the windshield or away from it? [Hint: See Example 4–15.]
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