A spring is stretched by 15 cm when a bag of oranges weighing 48 N is suspended from its end. a. Determine the spring constant.
b. How much elastic potential energy does the spring have when it is stretched this far?

The average atmospheric pressure on earth is approximated as a function of altitude by the relation patm = 101.325 (1 − 0.02256z)5.256, where patm is the atmospheric pressure in kpa, and z is the altitude in km with z = 0 at sea level. determine the approximate atmospheric pressures at atlanta (z = 306 m), denver (z = 1610 m), mexico city (z = 2309 m), and the top of mount everest (z = 8848 m).