You are welcome to search the collection of free essays and research papers. Thousands of coursework topics are available. Buy unique, original custom papers from our essay writing service.

11 results found, view free essays on page:

  • Drives Electrons Along An Electron Transport Chain
    1,368 words
    Since the cell membrane is somewhat permeable to sodium ions, simple diffusion would result in a net movement of sodium ions into the cell, until the concentrations on the two sides of the membrane became equal. Sodium actually does diffuse into the cell rather freely, but as fast as it does so, the cell actively pumps it out again, against the concentration difference. The mechanism by which the cell pumps the sodium ions out is called active transport. Active transport requires the expenditure...
  • Heat Energy
    994 words
    Thermodynamics is the branch of science concerned with the nature of heat and its conversion to any form of energy. In thermodynamics, both the thermodynamic system and its environment are considered. A thermodynamic system, in general, is defined by its volume, pressure, temperature, and chemical make-up. In general, the environment will contain heat sources with unlimited heat capacity allowing it to give and receive heat without changing its temperature. Whenever the conditions change, the th...
  • Development Of Kinetic Of Potential Energy
    1,107 words
    Work Work is said to be done when the point of application of a force moves and is measured by the product of the force and the distance moved in the direction of the force. Work = force x distance moved in direction of the force The SI unit of work is called the joule (J) and is the work done when the point of application of a force of 1 Newton (N) moves through 1 meter (m) in the direction of the force. Larger units used are the kilojoules (kJ) and the mega joule (MJ). Energy Anything which is...
  • Useful Forms Of Energy
    1,199 words
    Energy Four Source of Energy: Chemical, Solar, Mechanical, and Nuclear Energy is used in every aspect of our lives, from power for transportation, to heat and light in dwelling and working areas, to the manufacture of good of all kinds. The development of science and civilization is closely linked to the availability and development of energy in useful forms. In this paper I am going to show four extremely vital forms of energy that we humans use everyday, and without which we could not enjoy th...
  • Form Of Energy
    431 words
    . There are 5 forms of energy: mechanical, chemical, radiant, electrical, and nuclear. Mechanical energy is the form of energy of familiar objects and machines... Chemical energy is the form of energy involved in chemical reactions. Chemical energy is released in the chemical reaction known as oxidation... Radiant energy is energy that travels through space. Radiant energy includes light and all other parts of the electromagnetic spectrum... Electrical energy is another form of energy from elect...
  • Matter And Energy The Universe
    825 words
    The universe begins with a cataclysm that generates space and time, as well as all the matter and energy the universe will ever hold. For an incomprehensibly small fraction of a second, the universe is an infinitely dense, hot fireball. The prevailing theory describes a peculiar form of energy that can suddenly push out the fabric of space. On a rare occasion, a runaway process called "Inflation" can cause a vast expansion of space filled with this energy. The inflationary expansion is stopped o...
  • External World Through Pleasure And Pain
    1,696 words
    1. Freud defines three stages of sexuality, the oral, the anal and the oedipal stage. An infant in its oral stage learns that there is an external world through pleasure and pain. Human nature is governed by the pleasure principle. When the infant is being breast fed he / she feels pleasure and when pulled away from the breast the baby feels pain. The pleasure principle is a way of seeking pleasure in order to avoid pain. We can't be happy all the time because three things threaten us. First of ...
  • Glucose For Later Use As Energy
    1,094 words
    The Chemistry of Carbohydrates The chemistry of carbohydrates most closely resembles that of alcohol, aldehyde, and ketone functional groups. As a result, the modern definition of a carbohydrate is that the compounds are polyhydroxy aldehydes or ketones. The chemistry of carbohydrates is complicated by the fact that there is a functional group (alcohol) on almost every carbon. In addition, the carbohydrate may exist in either a straight chain or a ring structure. Ring structures incorporate two ...
  • Kinetic And Potential Energy
    443 words
    What do we really need, energy or power? This was a question proposed to me at the beginning of the semester and it really made me think. Energy is a property of matter that can be converted into work, heat, or radiation. It is the capacity for doing work, generating heat, and emitting light or radiation. Power is the rate of spending energy or energy per unit time. Immediately, I thought the answer was energy since you need energy to have power. But then I heard that the answer was power and it...
  • Most Promising Forms Of Renewable Energy
    1,379 words
    Merz 1 Dan Merz Ms. Berryman English 10215 May 2005 Big Money! Big Problem! Although current oil reserves are supplying the world with more than enough energy, the supply will be running out sooner than we think, making oil and other fossil fuels (natural gas, coal, crude oil, and propane) very expensive and unattainable for the masses. As a world leader the United States needs to seriously pursue alternative forms of energy now! Mentioning them in speeches and acknowledging them is simply not g...
  • Hydrothermal Vents Form At Mid Ocean Ridges
    623 words
    Hydrothermal Vents are considered by scientists to be very unique and complex communities of organisms. The reason for this is due to the fact that unlike most other organisms, Hydrothermal Vents are not powered by the sun's energy. Most organisms on the Earth+s surface depend on plants to produce nutrients from sunlight. This process is called photosynthesis. These communities are unique in that they depend on a different food-making process other than photosynthesis. Bacteria at the vents make...

11 results found, view free essays on page: