Platform area = 0.027[m2].
Wind Speed = 7.1[ms-1].
Air Density = 1[kg m-3].
Drag = 0.39[N].
Lift = 1.45[N].
Coeffecient of Lift =
Use three sig. figs. or N/A if no answer.
Platform area = 0.045[m2].
Wind Speed = 5.7[ms-1].
Air Density = 1[kg m-3].
Drag = 0.77[N].
Lift = 1.19[N].
Coeffecient of Lift = 1.63
What is the lift to drag ratio?
Use three sig. figs. or N/A if no answer.
What are the units for Coeffecient of Lift?
[kgm-3]
No units
[Ns]
[N2]
[N]
[ms-1]
[kg]
What are the units for the ratio Lift to Drag?
[Ns]
[kgm-3]
No units
[ms-1]
[kg]
[N2]
[N]
To find the coefficient of lift, we can use the formula:
Coefficient of Lift = Lift / (0.5 * Air Density * Platform Area * Wind Speed^2)
Plugging in the given values, we get:
Coefficient of Lift = 1.45 / (0.5 * 1 * 0.027 * 7.1^2) = 1.45 / 0.529287 = 2.743 (rounded to three significant figures)
So, the coefficient of lift is 2.74.
To find the lift-to-drag ratio, we use the formula:
Lift-to-Drag Ratio = Lift / Drag
Plugging in the given values, we get:
Lift-to-Drag Ratio = 1.19 / 0.77 = 1.545 (rounded to three significant figures)
So, the lift-to-drag ratio is 1.55.
The unit for the coefficient of lift is no units. It is a dimensionless quantity.
The unit for the lift-to-drag ratio is also no units. It is a dimensionless quantity.