A machine of efficiency 80% is used to lift a box. If the effort applied by the machine is twice the weight of the box. Calculate the velocity ratio of the machine

abuus07

2 years ago

Here's my opinion

Award0001

2 years ago

80/100 = L/2L ÷ v.r
0.8 = 1/2 × 1/v.r
0.8 = 1/2v.r
0.8×2×v.r = 1
1.6v.r = 1
v.r = 1/1.6 = 0.625

Nuellapromzy

8 years ago

y use 100% to calculate when the question stated 80%

OlanrewajuOmowunmiGrace042

7 years ago

E＝V.R/M.A＊100％
80＝V.R/2＊100
160＝V.R100
V.R＝1,60 option D