Is the force of gravity stronger on a piece of iron than on a piece of wood if both have the same mass?

The activity of an old piece of wood is just one fourth of a fresh piece of wood. If half life period of ""^(14)C is about 6000 years, the age of old piece of wood is:

The ""^(14)C content of a piece of wood after it is cut from a tree :

Can an object have more than one centre of gravity?

A rigid bar of mass 15 kg is supported symmetrically by three each 2.0 m long. Those at each end is to copper and the middle one is of iron. Determine the ratios of their diameters if each is to have the same tension.

The platinum wire is preferred to form tight seals with glans because both have the same

State whether the statements given below are True or False. A piece of wood floats on water.