You Torque the last piece of Pi... - Torque and Cross Product

I want to remind you all that your midterm is next Monday - exam business as usual with multiple choice and free response.

Also, PLEASE visit the REACH NYC website at http://www.reachnyc.org to register to receive your awards for any AP exams you will take in May. You must print out a copy of Part A, get it signed by your parents, and bring it in to me by next Wednesday. If you do not get these in by the final deadline, the most you can earn for a 3, 4, or 5 on an exam is $300, $400, or $500.


Solutions:

Page 235:
30.
a) Torque = (45 N)(0.84 m)sin(90) = 37.8 N*m
b) Torque = (45 N)(0.84 m)*sin(60) = 32.7 N*m

31.
a) The net torque is the sum of all torques:

-(35 N)(.1 m) - (20 N)(.2 m) + (30 N)(.2 m) = -1.5 N*m

Page 266.
3. 1764 N*m
4. 1.7 meters