Physics Test 27...

A circular steel wire 2.00 m long must stretch no more than 0.25 cm when a tensile force of 400 N is applied to each end of the wire. What minimum diameter is required for the wire? Young's modulus for steel: E = 20 × 10¹⁰ Pa.

Water is flowing continuously from a tap having an internal diameter 8 × 10^-3m. The water velocity as it leaves the tap is 0.4 ms^-1. The diameter of the water stream at a distance 2 × 10^-1 m below the tap is close to

There are two identical small holes on the opposite sides of a tank containing a liquid. The tank is open at the top. The difference in height between the two holes is h. As the liquid comes out of the two holes, the tank will experience a net horizontal force proportional to

Two soap bubbles with radii  come in contact. Their common surface has a radius of curvature r. Then

In an adiabatic process internal energy of gas

At what temperature is the r.m.s velocity of a hydrogen molecule equal to that of an oxygen molecule at 47°C?

Heat generated through a resistive wire will increase _______ times in unit time, if current in the wire becomes twice.

A sphere of mass m and diameter D is Heated by temperature ΔT , if Coefficient of linear expansion is α what will be the change in the Surface Area