A spring of constant k is stretched by distance X such that the elastic potential energy is E.  Another spring is stretched such that it also has elastic potential energy E.  What should be the force constant of the second spring if it had only stretched by 0.5X? a. k b. 0.5k c. 4k d. 2k   The surface tension of water is 0.07 N/m. Find the weight of water supported by surface tension in a capillary tube with a radius of 0.15 mm. (microN) 66 77 88 99   What is the increase in length of 50 m of copper wire rod when its temperature changes from 12 deg C to 32 deg C. For copper, alpha is 1.7 x 10^-5 /degC?  1.7 cm 1.8 cm 1.9 cm 2.0 cm

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