JAMB - Physics (2019 - No. 20)
The pitch of a screw jack is 0.45cm and the arm is 60cm long. If the efficiency of the Jack is 75/π %, calculate the mechanical advantage.
400
300
200
150
Explanation
P = 0.45cm, L = 60cm, Eff = 75/π%
| VR | (Screw | system) | = | 2πr
P |
= | 2πL
P |
| M.A | = | Eff% × VR
100 |
= | 75
π |
× | 1
100 |
× | 2π × 60
0.45 |
= | 75 × 800
300 |
= | 200 |
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