Hi i need some help with this assignment. website http://phet.colorado.edu/en/si

Question

Hi i need some help with this assignment.

website  http://phet.colorado.edu/en/simulation/balancing-act

1.       Calculate the torque produced by a 10 N force located 2 m from the fulcrum. _mN

2.       Calculate the torque exerted by a 20 kg object located 1.2 m from the fulcrum. _mN

3.       How much mass would be necessary to balance a 20 kg object located 1.25 m from the fulcrum if your added mass were to be located 2 meters on the other side of the fulcrum? _kg

4.        Which of the 4 mystery objects has the most mass?

5.       Which of the 4 mystery objects has the least mass?

6.       How far from the fulcrum would you place mystery object D in order to balance mystery object B, if B were placed 2 m from the fulcrum?

7.       A 20 kg mass is located 2 m from the fulcrum and a 10 kg mass is 1 meter from the fulcrum and a 10 kg mass is 0.5 m from the fulcrum

Explanation / Answer

1) T = r*F = 20 N.m

2) T = r*F = 1.2*20*9.8 = 235.2 N.m

3) 2*m = 20*1.25

==> m = 6.25 kg

4)

5)

6)

7) T = r1*F1 + r2*F2 + r3*F3

      = 2*20*9.8 + 1*10*9.8 + 0.5*10*9.8

      = 539 N.m

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