Chapter 7: Homework 2 Question 3 of 10 < > View Policies Question 4 of 10 < > -/10 -/10 View Policies Current Attempt in Progress The cost of electricity is typically based on the number of "kilowatt hours" used. One kwh is the amount of energy in joules used in one hour if the power was a constant 1000 watts for the entire hour. 23 Part 1 How many joules is 1 kwh? 1 kwh = i Save for Later Part 2 Current Attempt in Progress Part 1 A mass of 6000 kg is slowly lifted 31 m by a crane. If the lifting takes 49 s, what is the average power output of the crane? power = i Save for Later Attempts: 0 of 4 used Submit Answer Part 2 Suppose you run a motor for 24 minutes whose power rating is 250 watts. How many kwh of energy did you consume? energy = i eTextbook and Media Save for Later kwh Attempts: 0 of 4 used Su' SUPPORT watts Attempts: 0 of 4 used Submit Answer A different crane has a power output of 7.5 x 104 watts. How long would it take this crane to slowly lift the 6000 kg mass 31 m? At = i eTextbook and Media Save for Later S Attempts: 0 of 4 used Submit Answer SUPPORT