internal or external division

07. - Two identical cells of EMF 1.5 V each joined in parallel provide supply to an external circuit consisting of two resistors of 17 W each joined in parallel. A very high resistance voltmeter reads the terminal voltage of the cell to be 1.4 V. What is the internal resistance ..

There appear to be many structures that are similar because of the function they carry out and in their external appearance. However, these structures differ internally. Such structures are called analogous structures. For example, wings of bat and butterfly are similar in appe..

There are two types of heat engines: external combustion engines and internal combustion engines. Steam engine is an example of external combustion engine. In such an engine, the fuel is burnt outside the working portion of the engine. A heat engine consists essentia..

There are three types of movements associated with the eye that are due to the action of muscles. They are the movement of the eye, the change in size of the pupil and the change in thickness of the lens. The movement of the eye is controlled by six eye muscles that attach the sclera to the bones ..

We define the change in the potential energy of the system, corresponding to a conservative internal force, as Where 'W' is the work done by the internal forces on the system as the system passes from the initial configuration 'i' to the final configuration 'f' . We cannot defin..

Summary - While the nervous system and endocrine system have their own features, they have a common method of communication. Both the systems release chemicals to communicate between cells. Together these two systems carry out a very complex process of maintaining a homeostatic (balanced) inte..

Human Reproductive System - In human beings, sexual reproduction takes place. Sexes are separate and hence they are known to exhibit sexual dimporphism. Males have sex organs called the tetes while the females have sex organs called the ovaries. Even in the external appearance, males and ..

> In humans, the eyes are directed forward and give binocular vision. Ears are sensory organs that function as the organs of hearing and the organs for equilibrium. It has receptors that convert the vibrations into nervous impulses that are transmitted via the auditory nerve to the brain. Each ear ..

Heat absorbed by the system = 470 J or q = 470 J Work done by the system = 200 J or w = - 200 J According to first law of thermodynamics D E = q + w D E = 470 - 200 = 270 J 3. A gas absorbs 120 J of heat and expands against the external pressure of 1.10atm from a volume of 0.5L to 2.0L..

Patterns of Growth - Two patterns of growth are commonly seen in animals regarding the proportion of the various body parts. Isometric growth: In this growth pattern, an organ grows at the same rate as the rest of the body. As the organism growths, the size remains proportional. Examples: Fish and ..