Water flows through a frictionless duct with a cross-section varying as shown in fig. Pressure p &nb

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9-1.Fluid Mechanics

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Water flows through a frictionless duct with a cross-section varying as shown in fig. Pressure $p$ at points along the axis is represented by

Solution

(a)When cross-section of duct is decreased, the velocity of water increased and in accordance with Bernoulli’s theorem, the pressure $P $ decreased at that place.

Standard 11

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Water flows through a frictionless duct with a cross-section varying as shown in fig. Pressure $p$ at points along the axis is represented by

Solution

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A copper ball of radius $'r'$ travels with a uniform speed $'v'$ in a viscous fluid. If the ball is changed with another ball of radius $'2r'$ , then new uniform speed will be

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$Assertion :$ Falling raindrops acquire a terminal velocity.
$Reason :$ A constant force in the direction of motion and a velocity dependent force opposite to the direction of motion, always result in the acquisition of terminal velocity.