Jay Sharma Posted February 7, 2014 Posted February 7, 2014 (edited) Hello everyone my name is Jay and i m 16 year old and this is my first post i m not able to solve this problem so can someone help me please the question is as follows:- Under the action of a force,a 2 kg body moves such that its position x as a function of time t is given by x=t3/3,where x is in meters and t in seconds.Work done i first 2 sec is?? a)1600J b)160J c)16J d)1.6J please help me with it Thnx in advane i m not able to solve it Edited February 7, 2014 by Jay Sharma
ajb Posted February 8, 2014 Posted February 8, 2014 We like to help those that help themselves... So with that in mind, what is the definition of work done?
Jay Sharma Posted February 8, 2014 Author Posted February 8, 2014 according to me work done is force into displacement i have soled the question but not getting the answer according to the options
studiot Posted February 8, 2014 Posted February 8, 2014 (edited) according to me work done is force into displacement i have soled the question but not getting the answer according to the options This question, like all your others, belongs in the homework section. However the rules here are that you must show you working, right or wrong, to receive help. So post your calculation. Edit I think you need calculus for this one, have you done any? Edited February 8, 2014 by studiot
Jay Sharma Posted February 8, 2014 Author Posted February 8, 2014 see so where m i wrong???? my camera isnt very good hope u can see
studiot Posted February 8, 2014 Posted February 8, 2014 You haven't done any calculus in your working. Did you see my edit in my last post, asking if you understand calculus?
Jay Sharma Posted February 8, 2014 Author Posted February 8, 2014 i dont know calculas so please help me with this question
studiot Posted February 8, 2014 Posted February 8, 2014 (edited) You are told that the force causes the body to move along the x axis so that distance, x = t3/3. Do you think this force is constant during this movement? What do you know about the relationship between motion, distance covered, velocity and acceleration? Do you know anything about the relationship between force, mass and acceleration? If you do not know these things I will help, but why are you attempting this problem? Edited February 8, 2014 by studiot
Jay Sharma Posted February 8, 2014 Author Posted February 8, 2014 You are told that the force causes the body to move along the x axis so that distance, x = t3/3. Do you think this force is constant during this movement? What do you know about the relationship between motion, distance covered, velocity and acceleration? Do you know anything about the relationship between force, mass and acceleration? If you do not know these things I will help, but why are you attempting this problem? yes according to me force is cont the relation is s=ut+1/2at^2 f=ma i know these and this was a question in my test so i want to solve it
imatfaal Posted February 8, 2014 Posted February 8, 2014 ! Moderator Note Members should be aware that the OP Jay Sharma has been banned as a sockpuppet of Rajnish Kaushik.
studiot Posted February 8, 2014 Posted February 8, 2014 Well the only way this is possible is for you to have misread the problem (or they wrote it down incorrectly) Should you original statement have said x = t2/3 that is time squared not cubed?
Maddy Sharma Posted February 8, 2014 Posted February 8, 2014 Well the only way this is possible is for you to have misread the problem (or they wrote it down incorrectly) Should you original statement have said x = t2/3 that is time squared not cubed? as u can see the question is right the time is cubed and i tried to sove it and got answer as 9/2and 16/9 so how can i do it ??
studiot Posted February 8, 2014 Posted February 8, 2014 as u can see the question is right the time is cubed and i tried to sove it and got answer as 9/2and 16/9 so how can i do it ?? Then the force is not constant and you need calculus to solve the problem.
Maddy Sharma Posted February 8, 2014 Posted February 8, 2014 Then the force is not constant and you need calculus to solve the problem. so can u please tell me the answer since its quite urgent please please please and also help with others
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