A load W produces an extension of 1 mm in a thread of radius r. If the load is 4W in thread of radius 2r, all other things remaining same, then the extension (in mm) is :

A load of 20 kg produces an extension of 1 mm in a wire 3 m in length and 1 mm in diameter.l Calculate Young's modulus of elesticity of wire.

Young's moduli of two wires A and B are in the ratio 7:4 wire A is 2m long and has radius R. . wire B is 1.5 m long has radius 2mm for a given load , then the value of R is close to:

Work done in forming a liquid drop of radius R is W_(1) and that of radius 3R is W_(2) . The ratio of work done is

A spherical body of radius 10cm radiates 300 W at 227°C . If the radius is doubled and temperature is remain same, the power radiated will be

The length of a wire is increased by 1 mm on the application, of a given load. In a wire of the same material, but of length and radius twice that of the first, on application of the same load, extension is

A block of weight W produces an extension of 9cm when it is hung by an elastic spring of length of 60cm and is in equilibrium. The spring is cut into two parts, one of length 40cm and the other of length 20cm . The same load W hangs in equilibrium supported by both parts as shwon in figure. The extension in cm noe is

A block of weight W produces an extension of 9cm when it is hung by an elastic spring of length of 60cm and is in equilibrium. The spring is cut into two parts, one of length 40cm and the other of length 20cm . The same load W hangs in equilibrium supported by both parts as shwon in figure. The extension in cm noe is

A wire longates by 9 mm when a load of 10kg is suspended from it. What is the elongation when its radius is doubled, iff all other quantities are same as before ?

There is a horizontal film of soap solution. On it a thread is placed in the form of a loop. The film is pierced inside the loop and the thread becomes a circular loop of radius R . If the surface tension of the loop be T , then what will be the tension in the thread?

Figure shows a spool with thread wound on it placed on a smooth plane inclined at angle from horizontal. The spool has mass m, edge radius R , and is wound up to a radius r. its moment of inertia about its own axis is I . The free end of the thread is attached as shown in the figure. So that the thread is parallel to the inclined plane. T is the tension in the thread. Which of the following is correct?