physic For question 1, I honestly don\'t know what it is asking me. and for ques

Question

physic

For question 1, I honestly don't know what it is asking me. and for question 2 I worked out the problem but I keep getting different numbers everyone that ranges between 70 and 76. I would appreciate any step by step solution for it to see where I am getting it mixed up. Thanks!

1. Here's a diagram of a rod that's free to plvot about the point indicated. Is it possible to make the end of the rod push down (like, on an object that's underneath it), by puling on the left enofthe rout r so, show on the diagram the direction that you would pull on the left end of the rod, and explain you reasoning. If not, explain why not. make the right left end of the rod? If he rod, and explain your pivot 2. Suppose the length of your forearm is 34 cm, and its mass is 1.3 kg, If your h forearm 3.5 cm from the pivot (the elbow),and your biceps muscle can produ much weight can you curl? Model your forearm as a uniform rod. kg. lf your biceps i n produce a into the force of 800 N, how

Explanation / Answer

Force, F = 800 N

Force arm, df = 3.5 cm

Forearm weight, W1 = 1.3 kg

W1 arm, d1 = 34/2 = 17 cm

Weight to be lifted, W2, to be determined

W2 arm, d2 = 34 cm

With the axis of rotation at the left end of the forearm at point B (the elbow),

and the bicep exerting a force vertically upward

So, ( 800 N ) ( 3.5 cm ) = ( 1.3 kg ) ( 9.8 m / s 2 ) [ 0.5* ( 34 cm ) ] + W ( 34 cm )

distances from the elbow need not be converted to meter since the units cm

So after simplification, W = [ ( 800 N ) ( 3.5 ) / 34 ] 0.5( 1.3 kg ) ( 9.8 m / s 2 )= 76 N

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