The compressive stresses under the discharge vane in a scroll compressor are observed to be oc(t) = 9.65 2.95 cos(120nt), where t is measured in seconds and o(t) in ksi: B a) Determine the first three times where the slope of o(t) is zero. (i.e., doc/dt = 0). (5 points) b) Determine if the compressive stresses at those times are maximums or minimums by using doc/df. (5 points) c) Determine the compressive stresses (t) at the times from part a). (5 points) d) Using your results, sketch the compressive stress just under the discharge vane, oc(t) for 0 t 1/60 seconds. Clearly indicate the location and magnitude of the maximum compressive stress. (5 points) The compressive stresses under the discharge vane in a scroll compressor are observed to be oc(t) = 9.65 2.95 cos(120nt), where t is measured in seconds and o(t) in ksi: B a) Determine the first three times where the slope of o(t) is zero. (i.e., doc/dt = 0). (5 points) b) Determine if the compressive stresses at those times are maximums or minimums by using doc/df. (5 points) c) Determine the compressive stresses (t) at the times from part a). (5 points) d) Using your results, sketch the compressive stress just under the discharge vane, oc(t) for 0 t 1/60 seconds. Clearly indicate the location and magnitude of the maximum compressive stress. (5 points)