WAEC - Physics (1996 - No. 7)
Two spanners X and Y of lengths 15cm and 20cm respectively are used in turn to give a screw of pitch 2mm one complete rotation. If Rx and Ry are the respective velocity ratios of the spanners then the ratio Rx : Ry is
1 : 50
3 : 20
3:4
4:3
20:3
Explicació
Rx = 15/0.2 = 75
Ry = 20/0.2 = 100
Rx : Ry = 75 : 100 = 3 : 4
Ry = 20/0.2 = 100
Rx : Ry = 75 : 100 = 3 : 4