- #1
gake
- 12
- 0
Homework Statement
22) A 1-kg rock is suspended from the tip of a meter stick at the 0- cm mark so that the meter stick balances like a see-saw when the fulcrum is at the 25-cm mark. From this information, what is the mass of the meter
stick?
A) 1/4 kg
B) 1/2 kg
C) 3/4 kg
D) 1 kg
E) more than 1 kg
Answer: D
Homework Equations
Torque== length of lever arm * Force
The Attempt at a Solution
I keep on receiving B...
Counter Clockwise Torque:
0.25*F1
- F1==Force between 0 and 25 cm==g(1+.25MS)
- MS== mass of stick
Clockwise Torque:
0.75*F2
- F2==Force between 25 and 100 cm==g(0.75MS)
Counter Clockwise Torque==Clockwise Torque (because it balances)
0.25*g(1+.25MS)==0.75*g(0.75MS)
0.25g+0.0625gMS==0.5625gMS
0.25g==0.5625gMS-0.0625gMS
2.5==5.0MS
MS==0.5