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
1)Whenever work is being done,energy is converted from one form into another. 2)Whenever work is being done,energy is being converted from one form into another. 为什么第一句话正确? 答案 第二句是被动的进行时,而句子是描述的一般状况,从whenever就可以看出,所以要用第一句,就如一楼说的,这里不...
Workdone=constantorce×distancemovedindirectionotheorce=173.2N×150m =25980J Noticethatsincethesledgeismovingatasteadyspeedthereisnoresultantorce,sothereisa rictionalorceo173.2Nactingtothe le t. This is why we say ‘the explorer is doing work ...
1 Joule is the work done by 1 Newton moving 1 meter 1 J = 1 N × 1 m The Joule has the unitsN m, orkg m2/s2(because a Newton is kg m/s2) Only force and movement inthe same directioncount, so a more accurate description is: 1 J is the work done to an object when a forc...
ENERGYISTHEABILITYTODOWORK=TOAPPLYAFORCEOVERA
Problem 2: Find the change in internal energy when 3500 J of work is done on the system and1500 J of heat is added to the system. 相关知识点: 试题来源: 解析 Solution: We know that. Work is done on the system, so. Heat is absorbed, hence. Performing the calculation, we will have...
The meaning of WORK is to perform work or fulfill duties regularly for wages or salary. How to use work in a sentence. Synonym Discussion of Work.
Energy is the ability to do work. Question 3: Determine whether the statement below is true or false. 'Work is being done when the object moves perpendicular to the force applied on it.' true false Solution: (2) false Solution explanation: In order for work to be done, the object mus...
Theworkdoneinmovingtheblock3.0mtotherightbythe40Nforceatanangleof35°tothehorizontalis...W=Fd(cosθ)=(40N)(3.0m)(cos35)=98J Energy theability(capacity)todoworkEnergycomesinmanyforms:mechanical,electrical,magnetic,solar,thermal,chemical,etc...TheSIunitofenergyistheJoule.Joule.Energy,likework,...
First, force—or energy—must be applied to the object. If no energy is used, no work has been done.Second, the object must be moved a distance. If the object is pushed or pulledbut it doesn’t move, no work has been done.When we move an object, there’s always some resistance,...