- Letx¼the distance from the fulcrum where Tina should sit.
W 1 L 1 þW 2 L 2 ¼w 1 l 1 þw 2 l 2
72 ð 12 Þþ 90 ð 8 Þ¼ 96 xþ 80 ð 12 Þ
864 þ 720 ¼ 96 xþ 960
1584 ¼ 96 xþ 960
1584 960 ¼ 96 xþ 960 960
624 ¼ 96 x
624
96
¼
961 x
961
6 : 5 ¼x
Tina should sit 6.5 feet from the fulcrum.
180 LESSON 16 Solving Lever Problems