When work is done, energy is ___. A. created B. destroyed C. transferred D. unchanged 相关知识点: 试题来源: 解析 C。解析:做功时,能量被转移。选项 A,能量不能被创造。选项 B,能量不能被毁灭。选项 D,做功能量会变化。反馈 收藏
Work done & power to time User Guide Use this calculator to determine the power in watt, kilowatt or horsepower units, from the total energy transferred or work done for a given period of time. Formula The formula used by this calculator to determine the power from the work done and time...
Figure 1. examples of work. (a) The work done by the forceFon this lawn mower isFdcosθ. Note thatFcosθis the component of the force in the direction of motion. (b) A person holding a briefcase does no work on it, because there is no motion. No energy is transferred to or from...
Work done is the amount of energy transferred when a force is applied to an object and the object is displaced in the direction of the force. How is work done calculated? Work done is calculated by multiplying the force applied by the distance over which the force is applied, in the dire...
Work Transfers Energy What happens to the work done on a system? Energy is transferred into the system, but in what form? Does it remain in the system or move on? The answers depend on the situation. For example, if the lawn mower inFigure 7.1.1(a) is pushed just hard enough to ke...
energykineticworkpotential动能势能 451.7W kD ne,P tent ndK net Ene Studentss u dbe b et :1.7.1De neworkdone,potentialenergy,kineticenergy,ef ciencyandpower1.7.2Recognisethatwhenworkisdoneenergyistransferredfromoneformtoanother1.7.3Calculatetheworkdoneforconstantforces,includingforcesnotalongthelineofmot...
I Work Done/Energy Transferred in One Dimensional Collision Jan 6, 2022 Replies 5 Views 1K What is Work? Understanding the Concept of Work in Physics and Everyday Life Jul 11, 2019 Replies 3 Views 978 Is there any work done by static friction when accelerating a car? Jan 27, 2020...
Heat Energy -- a form of energy that is transferred by a difference in temperature What is Power Power is the work done in a unit of time. In other words, power is a measure of how quickly work can be done. The unit of power is the Watt = 1 Joule/ 1 second. ...
6 - Work、Energy、Power Workisonlydonebyaforceonanobjectiftheforcecausestheobjecttomoveinthedirectionoftheforce.Objectsthatareatrestmayhavemanyforcesactingonthem,butnoworkisdoneifthereisnomovement.Work,bydefinition,is theproductoftheforceexertedonanobjectandthedistancetheobjectmovesinthedirectionoftheforce.W=...
Work done on a body is equal to the increase in the energy of the body, for work transfers energy to the body. If, however, the applied force is opposite to themotionof the object, the work is considered to be negative, implying that energy is taken from the object. The units in wh...