Physics helps: torques & moments

I am really struggling with this material. It’s due tomorrow and I have had to work during office hours. I would love for someone to do this for me so I can compare my work thus far and also ensure that I get a good grade on the assignment. I only have 2 exams left and really want to boost my grade. 

 

I have attached the PDF of the assignment. 

  

Worksheet# 6: Torques and Moments of Force

1. Determine the torques generated by each of the following scenarios:

(1 pt)

(1 pt)

(2 pts)

( 2 pts)

(2 pts)

2. A patient rehabilitating a knee injury performs knee extension exercises wearing a 15 N
weight boot. Calculate the amount of torque generated at the knee by the weight boot for
the four positions shown, given a distance of 0.4 m between the weight boot’s COM and the
joint center at the knee. (8 pts)

3. A weight lifter is attempting to lift 150 N. The moment arm of this weight about her elbow
joint is 25 cm. The force created by the elbow flexor muscles is 2000 N. The moment arm
of the elbow flexor muscles is 2 cm. Is the athlete able to lift the weight with this amount of
force in her flexor muscles? (2 pts)

4. How much force needs to be provided by muscle

X

to keep this system in static

equilibrium? (2 pts)

60°

.025m

150N
45N .033m

.068m

X