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# (Physics question) I was reading some sample problems from

### Resolved Question:

(Physics question) I was reading some sample problems from the internet, but I don't get their explaining. The sample says A bike pedal is 45 cm from the axle. How much torque does a 90 lb. girl standing on the pedal exert when 1. it is horizontal? 2. it is at its lowest point? It then explains as follows: 1.t=rF 90 lb=90 divided by 2.2kg= 40.9 kg (my first question is where did 2.2 kg come from?) Then it goes on to say F= 40.9 kg * 9.8N/kg = 401N (my next questions are where did 9.8 N/kg come from? what does the N stand for or mean? and where did 401N come from?) Then it goes on to say t= 0.45m X 401N = 180 Nm (my next question is why 0.45 m from 45 cm?) Then it goes on to say 2. t=0. The force is in the same direction as r. no twisting motion. Can you please explain? Thank you for your assistance.
Submitted: 2 years ago.
Category: Homework
Expert:  akch2002 replied 2 years ago.
Is there any figure given with this question? When do you want answers for these questions? Kindly inform.
Customer: replied 2 years ago.

There is no figure. It is question # XXXXX on the following website:

http://quarkphysics.ca/phys2/mechanics/torque_sample.doc

There is no rush.

Thank you.

Expert:  akch2002 replied 2 years ago.

You need to spend \$3 to view this post. Add Funds to your account and buy credits.
akch2002, Engineer
Category: Homework
Satisfied Customers: 3091
Experience: Home work expert

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