The pitch of a screw jack is 0 45cm and the arm... - JAMB Physics 2019 Question
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.
A
400
B
300
C
200
D
150
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Correct Option: C
P = 0.45cm,
L = 60cm,
Efficiency(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 |
Hence, M.A = 200
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