The pitch of a screw jack is 0.45cm and the arm is 60cm long. If the efficiency of the ...
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.
Options
A) 400
B) 300
C) 200
D) 150
The correct answer is C.
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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P = 0.45cm, L = 60cm, Eff = 75/π%
P
P
100
π
100
0.45
300
Please can you explain this