Potential Energy and Solution - 1052 Words

Work and Energy Worksheet Section 1 Work: 1. A person pulls a toboggan for a distance of 35.0m along the snow. The force in the rope (tension) is 94.0N. How much work is done on the sled? Solution: W= Fd W= 94.0N x 35.0m W= 3290 Nm or J 2. The cable of a large crane applies a force of 2.2x10^4N to a demolition ball as it lifts it vertically a distance of 7.6m. a) How much work is done on the ball? b) Is the work positive or negative? Why? Solution: A.) W=( 2.2x10^4N) ( 7.6 m) W= 1.6x10^5 Nm or J B.) Positive, because the force on the system is positive. 3. When spring arrives a woman packs her winter clothes in a box and lifts it at a constant velocity to the top†¦show more content†¦What is the average force acting on the car from the drift? Solution: The work done equals the change in kinetic energy. Thus W= ∆KE=  ½m (v(f)^2 – v(i)^2) = (0.5) (5.0x10^3kg) x (8.0m/s – 20.0m/s)^2 = 62.5kg x -336m^2/s^2 W= -2.1x10^4 J Section 4 Conservation of Mechanical Energy: 14. A 2.00kg rock is released from a height of 20.0m. Ignore air resistance and determine the kinetic energy, gravitational energy and total mechanical energy at each of the following heights: 20.0m, 15.0m, 10.0m and 0m. Solution: @ 20m: potential energy is 2kg * 20m * 9.81m/s2 = 392.4joules, KE = 0 @10m : PE = 2kg * 10m * 9.81, and KE = 392.4/2 = 196.2 joules @ 0m : PE = 0, And KE = 392.4 joules Section 5 Power: 15. The building under renovation is 35m away from the construction supply. The laborer delivers the 9kg of sand to the building in 17 min. Determine the power of the laborer in watts. Solution: W= (9kg) (9.8m/s^2) (35m) = 88.2 N (35m) W = 3087 J / 17min convert min to sec. = 3087 J / 1020s P = 3.03 W PROJECT IN PHYSICS Submitted to: April Joy Ando Submitted by: Al khaleed Hassan amp; Fritzie RoseShow MoreRelatedCcea as Biology Coursework: an Investigation to Find the Water Potential of Potato and Carrot Tubers in a Sucrose Solution over a 24 Hour Period1394 Words   |  6 Pagesinvestigation to find the water potential of potato and carrot tubers in a sucrose solution, of concentration 0.00 – 0.50Mol, over a 24 hour period Interpretation Written Communication C1 From our graph it can be seen that the concentration of sucrose solution is 0.18 M at 0% change in mass for the potato and 0.355 M at 0% change in mass for the carrot. I will use these values to find the solute potential by using the calibration graph. I will work out the water potential by using the equation,Read MoreThe Effect Of Concentration On The Electrical Energy Output Essay1386 Words   |  6 Pagesthrough a redox reaction. The combined electric potentials of two metals in the metal sulphate solution of the electrolyte generate voltage. If the concentration of one of the electrolyte solutions is increased, the number of cations and anions increase (depending on which electrolyte you increase), which increases the overall voltage potential of the cell. Equilibrium conditions are not achieved when a current flow in the circuit. The cell potential will usually be reduced by various mechanisms;Read MoreChardakov method1369 Words   |  6 Pagesthe water potential of potato tis sue? Introduction All cells require essential materials to ensure their survival. Chemical, physical, and biological processes are used to move these materials inside of cells. Similar processes move waste materials outside of cells. These processes can be passive, occurring as a result of basic physical laws and requiring no outside energy from the cell or they can be active, requiring energy expenditure. Since all molecules possess kinetic energy (energy of motion)Read MoreThe Current Demand For Energy1237 Words   |  5 Pagesntroduction Europe experienced two energy crises during the 1970s, which led to escalating demand for energy resources (specifically, oil) that could not be adequately supplied (Bonny, 1987; Donatos Mergos, 1989). This led to a decrease in economic activity that reflected as a decrease in the demand for energy in the form of oil. Alternative energy sources needed to be considered in order to maintain the economic activities of society without further depleting the natural resources. Besides theseRead MorePhysics Of Heat And Energy Transfer Essay1169 Words   |  5 Pagesand energy transfer, more specifically how heat transfer relates to energy changes within a system. The laws of thermodynamics were developed to predict and outline behaviors of thermodynamic processes (5). The First Law of Thermodynamics states that â€Å"the change in a system s internal energy is equal to the difference between heat added to the system from its surroundings and work done by the system on its surroundingsâ⠂¬  (5). The idea behind this is conservation of energy, meaning all energy in andRead MoreThe Current Demand For Energy1224 Words   |  5 Pages1. Introduction Europe experienced two energy crises during the 1970s, which led to escalating demand for energy resources (specifically, oil) that could not be adequately supplied (Bonny, 1987; Donatos Mergos, 1989). This led to a decrease in economic activity that reflected as a decrease in the demand for energy in the form of oil. Alternative energy sources needed to be considered in order to maintain the economic activities of society without further depleting the natural resources. BesidesRead MoreThe Current Demand For Energy1238 Words   |  5 Pages1. Introduction Europe experienced two energy crises during the 1970s, which led to escalating demand for energy resources (specifically, oil) that could not be adequately supplied (Bonny, 1987; Donatos Mergos, 1989). This led to a decrease in economic activity that reflected as a decrease in the demand for energy in the form of oil. Alternative energy sources needed to be considered in order to maintain the economic activities of society without further depleting the natural resources. BesidesRead MoreA Major Area China s Air Pollution Effects On The Environment1568 Words   |  7 Pageshas pervaded through the air to neighboring countries including Korea, Japan, and some parts of North America (Air pollution in China). This causes some other countries to worry about China s ignorance towards the problem, because it has large potential to pervade the world. On the other end of the effects, the heavy air pollution in China causes a variety of health problems. The air pollution in china greatly increases the cases of cancer, respiratory diseases, chronic obstructive pulmonaryRead MoreAnalysis On The Energy Modeling Software1120 Words   |  5 Pagesaccurately measure the results of our engineering solutions, we have created a list of metrics for each objective that will allow us to evaluate if the retrofits are a success or failure. This will let us determine if the engineering objectives are being met and how well potential designs are performing. The first constraint that must be satisfied is for energy retrofits to not increase the amount of greenhouse gases produced by Sechrist Hall. The energy modeling software eQUEST will be used to modelRead MoreObserving Diffusion And Osmosis On The Rate Of Diffusion Across A Cell Membrane1384 Words   |  6 Pagesmolarity of the solution affect the diffusion and osmosis across a semi-perme able membrane? *Hypothesis-The solution will move from an area of low water potential to an area of high water potential and the higher the molarity, the more water will move into the membrane. Procedure 3(Observing Osmosis in Living Cells)- *Purpose-How do different solutions and water potentials affect the movement of water across a cell membrane? *Hypothesis-The water will move from an area of high water potential to an area