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Below you will find actual postings from the BrainMass Solution Library. These postings and responses can be downloaded for as little as $0.20 each from inside your BrainMass Student Account. Get instant homework help by creating a Student Account, Click here Subject: Physics Topic: Development and Consumption of Energy change topic change subject Determining final velocity using initial velocity and displacements in a ramp question. A 5 kg bowling ball is rolled back to the bowler over a ramp system. If the ball is given an initial velocity of 0.6 m/s at its starting point’s height which is 100 cm, what is the balls velocity at its ending point at 40 cm, after going over a height of 45cm first? So the ball leaves the first position goes through a dip up to 45 cm and ends at 40 cm. Download a solution to this problem. Understanding planetary characteristics. Graphics attached in gif format. What is the planet closest to the sun that you can see to the west right after the sun sets? Download a solution to this problem. Calculating efficiency. Water is 2 0m above an outlet pipe. The velocity is 16.1 ms-1, what is the efficiency?

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7. Mechanical And Materials Engineering Energy Conversion Homework Help Mechanical and Materials Engineering energy Conversion homework help from 1400+ Master s/PhDholding experts 24/7. http://www.brainmass.com/homeworkhelp/mechanicalmaterialsengineering/energyconve

Below you will find actual postings from the BrainMass Solution Library. These postings and responses can be downloaded for as little as $0.20 each from inside your BrainMass Student Account. Get instant homework help by creating a Student Account, Click here Subject: Mechanical and Materials Engineering Topic: Energy Conversion change topic change subject barrage energy example a) Calculate the volume of water that is available for power generation at the extremes of spring and nap tides? b) If during the time the turbines are running, the level of the water in the bay is 2m higher that that in the sea, what is the potential energy available from the scheme? c) Assuming the turbines and associated machinery have an overall efficiency of 30% and the average bulk price for electricity is 2p/kWh, what annual income is available? (we can assume that the height of the tides varies evenly between neap and spring levels) d) If investors are looking for a 15% return on capital employed, what is the maximum cost of the 17km barrage if it is to be privately financed and paid for by sales of electricity? e) Can you estimate the ratings of the generators, transformers, cables, etc (what assumptions do you have to make?) f) Was a 2m height difference the best choice? If no, what is, and why? Download a solution to this problem.

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Tutor Physics .com physics homework help math, chem help? click Home Ask Questions Latest Answers ... Properties of Matter If you push vigorously against a brick wall, how much work do you do on the wall? Explain. There is no work done on the wall as there is no displacement of the wall. Work = W = FsCosQ where: F - Force applied S - Displacement Q - Angle between F and S Work will be zero if F or S = or angle Q = 90 o In the current situation the wall is not moving and S is therefore zero. It follows that Work is zero, that is no work is done. A 0.2 kg rubber ball is dropped from the window of a building. It strikes the sidewalk below at 30 m/s and rebounds at 20 m/s. Find the change in momentum of the ball as a result of the collision with the side walk (in kg m/s). Mass of the rubber ball = 0.2 kg = m Initial velocity = 30 m/s = v Final velocity after collision = -20m/s = v Change in momentum = mv - mv = m(v - v = 10 kg m /s Q. A 2.0 kg block is thrown upward from a point 20m above Earth's surface. At what height above Earth's surface will the gravitational potential energy of the Earth block system have increased by 500J? Ans.

15. Physics Tutor:Homework Help: Answers To Laws Of Motion Questions And Problems math, chem help? click. FORMULATOR . SPEEDS UP homework. Formula F = mxa. This implies that linear momentum is conserved and kinetic energy is not conserved. http://tutor4physics.com/latestanswerslawsmotion.htm

Tutor Physics .com physics homework help math, chem help? click Home Ask Questions Latest Answers ... Properties of Matter "FORMULATOR" SPEEDS UP HOMEWORK Formula: F = m x a FORCE: N MASS: kg ACCELERATION: m/s Physics Formula Calculator from http://tutor4physics.com Q. A120 lb person is being lifted aloft by a rocket which accelerates uniformly to an upward speed of 300 ft/sec in 2 sec. a) What is the upward acceleration in multiples of g? Mass of the man = 120lb Final speed of the rocket = 300 ft/sec Time = 2 sec Acceleration of the rocket can be calculated from first equation of motion v = u + at 300 = + a x 2 a = 150 ft/sec b) What is the apparent weight of the person during acceleration? Free body diagram: N - Normal reaction which is equal to the apparent weight of the man. mg - Actual weight of the man ma = N - mg N = ma + mg = m (a + g) = m (4.7g + g) = 5.7mg = 5.7 x 120 g = 684g = 684 lbf. Q. A short 10 gram string is used to pull a 50 gram toy across a frictionless horizontal surface. If a 3.0 x 10 Newton force is applied horizontally to the free end. Find the force of the string on the toy, at the other end. Mass of the string = 10 grams = 10 kg Mass of the toy = 50 gm = 5 x 10 kg Mass of toy + string = 10 + 5 x 10 = 6 x 10 kg Force applied F = 3.0 x 10 N

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Library Services Find Your Library Ask a Librarian Reserve a PC Library Cards ... eBooks Good Reads Good Reads New Reads Book Clubs Youth Services Homework Help Kidspage TeenZone Library Resources eAudio Seniors ESL/Literacy Special Collections ... Email This Homework Help-Site Map ALPHA LIST OF HOMEWORK HELP TOPICS Click on a letter or use the scroll bar on the right of the screen to move to a specific location: [A] [B] [C] [D] ... Z Last Updated: April 8, 2004 A Aardvarks Abenaki Ability Tests Abolitionist Movement ... Acid Rain Actors Affirmative Action Africa Africa, Ancient African American History ... Anteaters Antelope Anthropology Ants Apache Apartheid ... Aztecs B Baboons Bacteria Badgers Baha'i Faith Bats Bears Bees Beetles Bibliography Help Bioenergy Biographies Biology Habitats Birds Birds of Prey Bobcat ... Buddhism Business Leaders Butterflies C Cahuilla Calculators Calculus Calendars ... China, Ancient

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Library Services Find Your Library Ask a Librarian Reserve a PC Library Cards ... eBooks Good Reads Good Reads New Reads Book Clubs Youth Services Homework Help Kidspage TeenZone Library Resources eAudio Seniors ESL/Literacy Special Collections ... Email This General General General The Adventures of Science Bob Science basics for younger students, provided by "Science Bob" Pflugfelder, a science teacher who has been featured on television and in several magazines including People, Bop, and Nickelodeon Magazine for his work teaching science to many well-known young actors. Back to Basics Sites providing an introduction to several basic science concepts. Annotated lists of sites are available for atoms and molecules, DNA and genes, electromagnetic radiation, energy, the immune system, the solar system, the structure of the earth and weather and climate. From the Australian Academy of Science. Beyond Discovery: The Path to from Research to Human Benefit A series of articles in agriculture, biology, chemistry, earth sciences, environmental issues, health, mathematics, physics and technology that trace the origins of important recent technological and medical advances. Each story reveals the crucial role played by basic science, the applications of which could not have been anticipated at the time the original research was conducted. From the National Academy of Sciences.

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19. Jiskha Homework Help - Science: Physics: Lasers losses increase greatly with temperature, as the electrons are given more thermal energy. Jiskha homework help Newsletter Enter your email address to subscribe http://www.jiskha.com/science/physics/lasers.html

Tuesday, June 8, 2004 Homework Help Forum Homework Help Experts Lasers by Emily McPherson LASER stands for Light Amplification by the Stimulated Emission of Radiation. In 1917 Albert Einstein calculated the conditions necessary for stimulated emission; but, it was only much later, in 1960, that the first visible LASER was demonstrated by T. Maiman. However, a MASER, a similar device that emitted energy in the microwave region was the first to be developed. Basic Concepts Normally when an electron gains energy there is a random time delay before it spontaneously emits the energy as light. Sometimes this emission is said to come from a 'forbidden transition' and the time delay is much longer, though still random. This is called Spontaneous emission. If during this waiting period the electron is hit by a photon of light the electron will instantly emit its energy. This is called Stimulated emission. An unusual feature of this is that the photon emitted will be traveling in the same direction as the original photon. For this process to be sustained the rate of stimulated emission needs to be greater than that of spontaneous emission. This state is called a Population Inversion, where there are more excited electrons than unexcited electrons. However, with just two energy state involved this will never be achieved. Three or four energy levels are generally used.

20. Jiskha Homework Help - Social Studies: World Issues: The Pros And Cons Of Nuclea Nuclear power is one the safest methods of producing energy. Jiskha homework help Newsletter Enter your email address to subscribe http://www.jiskha.com/social_studies/world_issues/nuclear_energy.html

Tuesday, June 8, 2004 Homework Help Forum Homework Help Experts The Pros and Cons of Nuclear Energy Pros - 1. Little Pollution 2. Reliability Nuclear power plants need little fuel, so they are less vulnerable to shortages because of strikes or natural disasters. International relations will have little effect on the supply of fuel to the reactors because uranium is evenly deposited around the globe. One disadvantage of uranium mining is that it leaves the residues from chemical processing of the ore, which leads to radon exposure to the public. These effects do not outweigh the benefits by the fact that mining uranium out of the ground reduces future radon exposures. Coal burning leaves ashes that will increase future radon exposures. The estimates of radon show that it is safer to use nuclear fuel than burn coal. Mining of the fuel required to operate a nuclear plant for one year will avert a few hundred deaths, while the ashes from a coal-burning plant will cause 30 deaths. 3. Safety Cons - 1. Meltdowns 2. Radiation

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