Mechanical Properties of Fluids
Eight drops of water, each of radius 2 mm are falling through air at a terminal velocity of 8cms−1. If they coalesce to form a single drop, then the terminal velocity of combined drop will be:
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Water is allowed to flow through a capillary tube of 10 cm length and 2 mm diameter under a constant pressure difference of 6.5 cm of water level. If 0.16 litre of water flows in 1 minute, its coefficient viscosity is
Rain drops, each of radius r, are falling through air with steady velocity v. If eight drops coalesce to form a big drop, then the big drop so formed will fall with velocity ?
A small solid ball of density half that of water falls freely under gravity from a height of 19.6 m and then enters into water. Upto what depth will the ball go? How much time will it take to come again to the water surface? Neglect air resistance, viscosity effects of water and energy loss due to collision at water surface. (g=9.8 m/s2)
A liquid having coefficient of viscosity 0.02 decapoise is filled in container of cross section area 20m2. if viscous drag between two adjacent layers in flowing is 1N , then the viscous gradient is:
A spherical body of mass m and radius r is allowed to fall in a medium of viscosity η. The time in which the velocity of the body increases from zero to 0.63 times the terminal velocity(v) is called time constant(τ). Dimensionally, τ can be represented by
A small metal ball of mass 'm' is dropped in a liquid contained in a vessel, attains a terminal velocity 'V'. If a metal ball of same material but of mass ′8m′ is dropped in same liquid then the terminal velocity will be.
A object of mass 1 kg and radius 1 m is falling vertically downward inside liquid in a gravity free space. At t=0 velocity of the sphere is 2ms−1. If the of viscosity of the liquid is 18π1 Pas, the velocity of the ball will become 0.5ma −1 after a time (in second)
The terminal speed attained by an aluminium sphere of radius 1 mm falling through water at 200 will be close to ( Assuming laminar flow, specific gravity of AI=2.7andηwater=8×10−4PI)