es be (b) Calculate the accelera- ween tion when the spring reaches the point where its compres- sion is 0.05 m. (c) What are 30 0 the magnitude and direction of the acceleration when pull the spring reaches the point A FIGURE 5.64 Problem 57. un- where its compression is zero? ittle 58. Il The stretchy silk of a certain eet, BIO species of spider has a force n/s constant of 1.10 mN/cm. 30 e's The spider, whose mass is 70 the 15 mg, has attached her- A self to a branch as shown in Figure 5.65. Calculate (a) the C tension in each of the three strands of silk and (b) the dis- tance each strand is stretched beyond its normal length. A FIGURE 5.65 Problem 58. 59. II Block A in Figure 5.66 weighs 60.0 N. The coeffi- CA cient of static friction between 45.0 the block and the surface on which it rests is 0.25. The weight w is 12.0 N and the system remains at rest. (a) Find the friction force exerted W on block A. (b) Find the maxi- mum weight w for which the A FIGURE 5.66 Problem 59. will remain at rest. way