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Calculating moments Students are building a robot for lifting objects. Their prototype has an extendable arm that weighs 25 lb, and picks up a 125 lb load at B. To prevent the robot from tipping, a 250 lb weight is applied at the base of the robot as shown. 25 lb 125 lb 4 a V A a 250 lb 4.1 Calculate M1@A due to the 250 lb weight. 4.2 Calculate M1@A due to the 25 lb weight. Leave your answer in terms of x. 4.3 Calculate Mm due to the 125 lb weight. Leave your answer in terms of x. 4.4 Calculate the total Mz@A due to all 3 forces. Leave your answer in terms of x. 4.5 If the robot starts to tip when the total Mz@A is equal to 100 lb-ft, what is the maximum possible length of the robot arm (x)