Ans a , b , d , e??????????????
Answers
●a● If we blow over a piece of paper velocity of air above the paper becomes more than of below it.
As kinetic energy above the paper increases so in accordance , Pressure + Kinetic energy is constant.
It's pressure decrease due to the value of pressure below the piece of paper is equal to atmospheric pressure. It remains horizontal and does not fall . So the paper will not remain horizontal.
●b● This can be applied from equation of continuity i.e A1V1 = A2V2 , As we try to close a tap with fingers . Considerably as opening between our fingers provides consistency . Thus , velocity of water increases greatly and fast jets of water comes through the opening between our fingers .
●d● When fluid is flowing out of vessel it requires a large velocity and hence possess large momentum . Since no exit force is acting on system , a backward velocity must be attained by vessel .
●e● This is due to magnus effect . Let a ball moving to the right be given a spin at the top of the bob . The velocity of air at top is higher than velocity of air below the bob.
So according to Bernoulli's theorem , the pressure above the ball is less than the pressure below . Thus , there is a net upward force on spinning ball . So the ball follow a curved path.
●a● If we blow over a piece of paper velocity of air above the paper becomes more than of below it.
As kinetic energy above the paper increases so in accordance , Pressure + Kinetic energy is constant.
It's pressure decrease due to the value of pressure below the piece of paper is equal to atmospheric pressure. It remains horizontal and does not fall . So the paper will not remain horizontal.
●b● This can be applied from equation of continuity i.e A1V1 = A2V2 , As we try to close a tap with fingers . Considerably as opening between our fingers provides consistency . Thus , velocity of water increases greatly and fast jets of water comes through the opening between our fingers .
●d● When fluid is flowing out of vessel it requires a large velocity and hence possess large momentum . Since no exit force is acting on system , a backward velocity must be attained by vessel .
●e● This is due to magnus effect . Let a ball moving to the right be given a spin at the top of the bob . The velocity of air at top is higher than velocity of air below the bob.
So according to Bernoulli's theorem , the pressure above the ball is less than the pressure below . Thus , there is a net upward force on spinning ball . So the ball follow a curved path.