Only need help with #3 not #2. Part 3 determining an unknown mass Hs Adjust the

Question

Only need help with #3 not #2. Part 3 determining an unknown mass Hs Adjust the knife-edge so that it is at the center of mass of the meter stick. r6 Place one of the unknown masses at the 80cm mark. r Place a known mass on the opposite side ofthe fulcrum so that it balances the system (choose the known mass such that its lever arm is significantly different from the unknown mass lever arm). 18. Record the known mass and both lever arms in table 3. T9 Repeat steps 17 and 18 with a different known mass 20. calculate the moment from the known mass, and determine the moment from the unknown mass 21. Calculate the unknown mass. 22. Weigh the unknown mass on a balance to measure its mass. actual mass from step 19. the ed mass from step 18 compared to the

Explanation / Answer

As shown in figure above from meter stick we can measure D1 and D2 also we know the mass w1 now balance the moment of weight of mass w1 and w2.

w1*g*D1 = w2*g*D2 ( where g os gravitational acceleration, w*g will be graviational pull)

w2= (w1*D1)/(D2 ) Kg we can find out w2 as we know w1 , D1 and D2 .

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