Mechanical Properties of Fluids
A rain drop of radius 1.5 mm, experiences a drag force F= (2×10−5v)N, while falling through air from a height 2 km, with a velocity v. The terminal velocity of the rain drop will be nearly (use g=10m/s2)
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The properties of a surface are different from those of the bulk liquid because the surface molecules:
Assertion :A large soap bubble expands while a small bubble shrinks, when they are connected to each other by a capillary tube. Reason :The excess pressure inside bubble (or drop) is inversely proportional to the radius.
An ice cube of edge 1 cm melts in a gravity-free container. The approximate surface area of water formed is
Pressures insides two soap bubbles are 1.01 and 1.02 atmospheres. Ratio between their volumes is :-
A particle of mass m attached to an inextensible light string is moving in a vertical circle of radius r. The critical velocity at the highest point is vo to complete the vertical circle. The tension in the string when it becomes horizontal is
A bubble of radius R in water of density ρ is expanding uniformly at speed v. Given that water is incompressible the kinetic energy of water being pushed is :
A thread is tied slightly loose to a wire frame as shown in the figure And the frame is dipped into a soap solution and taken out The frame is completely covered with the film. When the portion A is punctured with a pin the thread
Inside a soap bubble of diameter 0.35 cm, the air pressure is equal to the 8 mm of water outside it, the surface tension of solution will be( ρ=1gm/cc)