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In a test experiment on a model aeroplane in wind tunnel, the flow speeds on the upper and lower surfaces of the wings are 70 ms-1 and 65 ms-1 respectively. If the wing area is 2 m2, the lift of the wing is N. (Given density of air =1.2 kg m-3)
810
Bernoulli: Plower-Pupper= 12 (vup2-vlow2 )
Lift F= 12 (vup2-vlow2 )A
= 12 1.2 (702-652 ) 2
=1.2 (135 5)=810 N
Answer: 810
A small liquid drop of radius R is divided into 27 identical liquid drops. If the surface tension is T, then the work done in the process will be:
Given below are two statements : In the light of the above statements, choose the most appropriate answer from the options given below :
The reading of pressure metre attached with a closed pipe is 4.5 104 N/m2. On opening the valve, water starts flowing and the reading of pressure metre falls to 2.0 104 N/m2. The velocity of water is found to be V m/s. The value of V is .