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12/11/2015 5:41:27 AM
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AHHH! PHYSICS! HELP!
Exam tomorrow, and I am -blam!-ed. "The cart above (mass 2 kg) rests on a frictionless surface between two identical springs. A student displaces it 4cm to the right with a horizontal force of 8N. Where will the cart be 3s after release?"
How the hell would I know?
English
#Offtopic
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Uh.... Gravity!
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2 Antworten[quote]Exam tomorrow, and I am -blam!-ed. "The cart above (mass 2 kg) rests on a frictionless surface between two identical springs. A student displaces it 4cm to the right with a horizontal force of 8N. Where will the cart be 3s after release?" How the hell would I know?[/quote] F=-Kx, so you can calculate the K value of both springs since they're identical. You can use the sum of the forces (EF=ma), and use -Kx1+Kx2=ma to find the acceleration. Use some kinematic equations given a, v0, and t, calculate X.
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4 AntwortenTest every scenario in the real world. Of course it'll take time but you'll get the real answer everytime.
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2 AntwortenUse your head.....
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1 AntwortenBearbeitet von akshatt132: 12/12/2015 3:09:32 AMFind work done by F.S this is the increase in potential energy of the spring (since its displaced, not thrown hence no kinetic energy) equate this with 1/2kx² where we know the displacement = 4 cm. Now we have spring constant. Now at this position force on cart = kx therefore acceleration = k/m x.(F=ma) Now acceleration(a)= VdV/dS where V is velocity and S is displacement. Integrating VdV=k/m xdS with limits on v as 0 to v and x as 4 cm to x. We get velocity as function of distance. V²/2 = k/m x²/2 taking underroot, V= (k/m)½ x now, v = dX/dt Therefore dx/x = dt (k/m)½ Is ln (x/0.04) = t (k/m)½ ( since initial displacement = 0.04) put k,m and get value of x. (Its most probably correct) Or you can do it with simple harmonic motion much easily if you know eyuation of shm.
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3 AntwortenBearbeitet von Partarar: 12/12/2015 2:39:56 AMSorry. I'm in applied Physics. That involves fun competitions and using power tools. Also it probably would've gone better if you sacrificed study time for sleep.
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1 Antworten[quote]How the hell would I know?[/quote] You would if you did your homework.
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5 AntwortenYou could have like studied
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I read that as psychics. [spoiler]oh no..[/spoiler] [spoiler]THEY HAVE COME[/spoiler]
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3 AntwortenI could help you if I knew the spring constant, or if I had an accurate diagram ((((Spring)))object(((spring))) ---FRICTIONLESS SURFACE---- Is that right?
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1 AntwortenI think I did this wrong, my final answer was Mars
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ask your teacher
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Bearbeitet von Jotaro Kujo PhD: 12/12/2015 1:14:01 AMF = dp/dt, kinematics equations, and spring equations can all help you.
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1 AntwortenUse f=ma to get acceleration. Then use the displacement and time and acceleration for kinematics.
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2 AntwortenJust know that… [spoiler]Guns don't kill people [/spoiler] [spoiler]The kinetic energy of the bullet does[/spoiler]
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6 AntwortenBearbeitet von tomzilla51501: 12/11/2015 5:55:24 AMI hope U do well in the exam
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2 AntwortenCommon Core Math
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*insert Calvin & Hobbes reference here*
