WAEC - Physics (2015 - No. 13)
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
설명
clockwise movement = anticlockwise movement
w x 10 = 22 x 30
w = \(\frac{22 \times 30}{10}\)
w = 66.0g
w x 10 = 22 x 30
w = \(\frac{22 \times 30}{10}\)
w = 66.0g