PHSX 114 - Homework #21

# PHSX 114 - Homework #21 - 3.9 kg Enter scientific notation...

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PHSX 114 – HOMEWORK # 21 Question 1: (2 points) Three children are trying to balance on a seesaw, which consists of a fulcrum rock, acting as a pivot at the center, and a very light board 3.6 m long (see figure). Two playmates are already on either end. Boy A has a mass of 50 kg, and girl B a mass of 35 kg. Where should girl C, whose mass is 25 kg, place herself so as to balance the seesaw? x = [Num] [Units] Question 2: (2 points) a. Calculate the force, F M , required of the “deltoid” muscle to hold up the outstretched arm shown in the figure given below. The total mass of the arm is

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Unformatted text preview: 3.9 kg . Enter scientific notation as 1.23E4. [Num] [Units] b. Calculate the magnitude of the force F J exerted by the shoulder joint on the upper arm. Enter scientific notation as 1.23E4. [Num] [Units] 1 Question 3: (2 points) The Leaning Tower of Pisa is 55 m tall and about 7.0 m in diameter. The top is 4.5 m off center. Is the tower in stable equilibrium? IF NO, enter 0 m for your answer; IF YES, how much farther can it lean before it becomes unstable? Assume the tower is of uniform composition. Enter 0 m if the tower is not in stable equilibrium. [Num] [Units] 2...
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PHSX 114 - Homework #21 - 3.9 kg Enter scientific notation...

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