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= [ unstrained position without the box moving when 1t 1s releasedr 5. [@ B8 A person who weighs 670 N steps onto a spring scale in the bathroom, and the spring compresses by 0.79 cm. (a) What 1s the spring constant? (b) What 1s the weight of another person who compresses the spring by 0.34 cm? 6. [@ A spring (k = 830 N/m) is hanging from the ceiling of an elevator, and a 5.0-kg object 1s attached to the lower end. By how much does the spring stretch (relative to its unstrained length) when the elevator is accelerating upward at ¢ = 0.60 m/s2? 7.8 A 0.70-kg block is hung from and stretches a spring that is attached to the ceiling. A second block is attached to the first one, and the amount that the spring stretches from its unstrained length triples. What 1s the mass of the second block? 8.0 A uniform 1.4-kg rod that is 0.75 m long is suspended at rest from the ceiling by two springs, one at each end of the rod. Both springs hang straight down from the ceiling. The springs have 1dentical lengths when they are unstretched. Their spring constants are 59 N/m and 33 N/m. Find the angle that the rod makes with the horizontal. 9. [0 ED In 0.750 5, a 7.00-kg block is pulled through a distance of 4.00 m on a frictionless horizontal surface, starting from rest. The block has a constant acceleration and is pulled by means of a horizontal spring that 1s attached to the block. The spring constant of the spring is 415 N/m. By how much does the spring stretch? 10. D ) Review Conceptual Example 2 as an aid in solving this problem. An object is attached to the lower end of a 100-co1l spring that is hanging from the ceiling. The spring ofrt—\fr\l’\t—\v ]’\‘r fl 1Rfl ™ T]r\l—\ CflY“;‘l’\r\“ ';o f]’“ll—\fl ~t ;nfn TYATN ‘;r‘]PY\f;f")]