A uniform bar AB is balanced on a knife-edge which is 60cm from B by a mass of 22g which hangs at C 10cm from A. Calculate the mass of the bar.
- 133.2g
-
66.0g
- 60.0g
- 22.0g
The correct answer is: B
Explanation
clockwise movement = anticlockwise movementw x 10 = 22 x 30
w = \(\frac{22 \times 30}{10}\)
w = 66.0g