Work‚energy and power-Test 1 MATHMANIA September 24‚ 2013 Instructions - All questions carry 1 mark each TOTAL - 20 marks 1. A rod of mass m and length l is lying on a horizontal table. Find the work required to make it stand on one end. 2. A body is moved along a straight line by a machine delivering constant power. The distance moved by the body in time t is proportional to what power of time? 3. When kinetic energy of a body is increased by 300%‚ its momentum increases by what %? 4.
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QUESTION( Conservation of Energy) 1. Missy Diwater‚ the former platform diver for the Ringling Brother’s Circus had a kinetic energy of 15 000 J just prior to hitting the bucket of water. If Missy’s mass is 50 kg‚ then what is her speed? Solution: According to energy conservation‚ the kinetic energy at the bottom of the dive (15‚000J) is equal to her gravitational potential energy before the dive. We can use this fact to find her dive height: PE = mgh h = PE/mg = 15‚000J / (50kg)(9.81m/s²)
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Tutorial – Work‚ Energy (Assume the acceleration due to gravity‚ g = 9.81 m/s2 ) 1. Calculate the work done when a force of 40 N pushes an object a distance of 500 m in the same direction as the force. 2. Calculate the work done when a mass is lifted vertically by a crane to a height of 5 m‚ the force required to lift the mass being 98 N. 3. A spring‚ initially in a relaxed state‚ is extended by 100 mm. Determine the work done by using a work diagram if the spring requires
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Introduction Chemical Kinetics‚ described as the study of rate of chemical processes‚ varies on many factors to determine the time needed for a reaction to complete. The rate of reaction of a chemical reaction is important‚ as reactions are of little use if the time period needed for the reaction to occur is too lengthy. Many factors influence the rate of a chemical reaction‚ such as temperature‚ concentration and surface area. The order of the reaction is based on the concentration of the reactants
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the power also zero. Answers: A Question 6: Any object that has kinetic energy must be a) moving. b) falling. c) high above the ground. d) at rest. Answers: A Question 7: A book is at rest on a tabletop. One student calculates the potential energy as 15 J. Another student calculates the potential energy as 20 J. Which statement is correct? a) One or both of the students must have calculated the potential energy incorrectly. b) Both answers could be correct. c) Both answers are
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Experiment 7: Work‚ Power and Energy Laboratory Report John Karl Macrohon Department of Math and Physics College of Science‚ University of Santo Tomas España‚ Manila Philippines Abstract The experiment is subdivided into two activities: Power and Energy of a Tossed Ball (Physics with Computers). The work done by gravity on each member when going up and downstairs of the second and third floors of the Main Building and the power output of each member of the group in each case was computed
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KINETICS OF THE ACID DECOMPOSITION OF THIOSULFATE Aqueous solutions of thiosulfate‚ S2O32-(aq) are stable if neutral or basic‚ but decompose quickly when the thiosulfate is dissolved in acid according to the equation: Sulfur dioxide is a gas at room temperature‚ but is very soluble in water. Sulfur‚ a water insoluble solid‚ forms a colloidal suspension. As a result‚ the solution first becomes cloudy and then opaque. We can take advantage of the developing opacity of the reaction system to do a
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Describe and explain the factors that influence how much a work a river can do (25) The work that a river does is erosion‚ transportation and deposition. The amount of work a river can do is dependent on the energy it has and this energy is determined by many factors. The study of water flow in a river channel is known as hydraulics. Hydraulic geometry is the study of the relationships that exist within river channels that ultimately determine how much work the river will be able to carry
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[Lab 5: Conservation of Energy] [Yuyu Bao] Lab Partners: [Suyu Chao] TA: Jack Rory Staunton Section: [THU 4:25 PSH-366] ABSTRACT This lab I calibrated experiment equipment‚ did experiment steps (most do not include the computer steps) and assist partners in order to use computer software better. The experimental principle is the total energy of the kinetic and potential energy‚ elastic potential energy of the spring on the swing
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Conservation of Energy Lab Honors Physics December 9‚ 2014 Date Performed: December 5‚2014 Instructor: Mrs. Kelly I. Objective: Calculate the speed of the Bunny on release from the table II. Procedure: 1. Gather All Materials 2. Place the bunny turned in on itself on the ground (this enables the toy to launch itself upward by suction; elastic and potential energy). Do so 5 times 3. Measure the height traveled by the stopper using a meter stick per each trial. 4. Using the measurements
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