Question

A flat plate 1.5m x 1.5m moves at 50 km/hr in stationary air of density 1.15 kg/m3 If the drag and lift force are 37.44 N and 187.20 N respectively, determine the power required to keep the plate in motor in kW and choose the correct answer from the following​

Answer 1

Answer:

Hence we have to find, the power required to keep the plate in motor in kW,   P = 0.520 KW.

Explanation:

From the above question,

They have given :

A flat plate 1.5m x 1.5m moves at 50 km/hr in stationary air of density 1.15 kg/m3 If the drag and lift force are 37.44 N and 187.20 N respectively, determine the power required to keep the plate in motor in kW

Ares of plate , A = 1.5 * 1.5

Ares of plate , A = 2.25$m^{2}$

Velocity of the plates,

                        U = 50 km/hr

                           =   $\frac{50 * 1000}{60 * 60}$

                           = 13.89 m/s.

We have to find, the power required to keep the plate in motor in kW.

Lift force = 187.20N

Drag force = 37.44N

Resultant Force = 190.90N

Power required to keep the plates in motion,

                        P = 0.520 KW

Hence we have to find, the power required to keep the plate in motor in kW,   P = 0.520 KW.

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Answer 2

The power will be 0.520 kW.

Given,

Area = 1.5*1.5 m²

Speed= 50km/hr

Density= 1.15 kg/m³

Drag force=37.44N

Lift force=187.20 N

To find,

Power=?

Solution,

We can simply solve this problem, by the following method:

Net force= 187.2 - 37.44

Net force= 149.76

Power= F.v

P= 149.7 *50 =0.520 kW

Hence, power will be 0.520 kW.

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