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5 A ladder 4 m. long having a mass of 15 kg. is resting against a floor and a wall for which the coefficients of static friction are 0.30 for the poor to which a man having a mass of 70 kg. can climb without causing the plank to slip if the plank makes an angle of 40' with the horizontal

15 kg
2m
70kg
N2
F2
2m
40
Fi
TN

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When you lift an object by moving only your forearm, the main lifting muscle in your arm is the biceps. Suppose the mass of a forearm with hand is 1.60 kg. If the biceps is connected to the forearm a distance of 2.4 cm from the elbow, how much force must the biceps exert to hold a 42 N ball at the end of the forearm at distance of 36.0 cm from the elbow, with the forearm parallel to the floor, in Newtons? Use g = 10.0 m/s2. Your answer needs to have 3 significant figures, including the negative sign in your answer if needed. Do not include the positive sign if the answer is positive. No unit is needed in your answer, it is already given in the question statement.
2. A 3.0-m-long ladder leans against a wall at an angle of 60° with respect to the floor. What is the minimum value of us, the coefficient of static friction with the ground, that will prevent the ladder from slipping? Assume that friction between the ladder and the wall is negligible. Center of gravity 19 TULO L 60⁰ Weight acts at the center of gravity. Known L-30 m Find Me Contro <= 0 about this point. Static friction prevents slipping.