A 1.2-kg mass is projected up a rough
circular track (radius = 0.80 m) as
shown. The speed of the mass at point
A is 8.4 m/s, and at point B, it is 5.6 m/s.
What is the change in mechanical
energy between A and B caused by the
force of friction? *

(b) suppose that consolidated power decides to use a level of significance of α = .05, and suppose a random sample of 100 temperature readings is obtained. if the sample mean of the 100 temperature readings is x⎯⎯ = 60.990, test h0 versus ha and determine whether the power plant should be shut down and the cooling system repaired. perform the hypothesis test by using a critical value and a p-value. assume σ = 5. (round your z to 2 decimal places and p-value to 4 decimal places.)