Question

(ii) The total length of the ruler is 80 cm. The 50 g mass is hung from the 8 cm mark on the ruler. Calculate the mass of the ruler. Show all your working.

use the diagram below.​

Answer 1

Step-by-step explanation:

The moments around the fulcrum must = 0 for the balance to occur .

Moment of the mass of ruler on the left ( 18 of the 80 cm)

9 * 18/80 m

Moment of the 50 kg mass

10 * 50

Moment of the Right side of the ruler (62 of the 80 cm)

62/80m * 31

9 * 18/80 m + 10 * 50 = 62/80 m * 31

2.025 m + 500 = 24.025 m

m = 22.73 kg