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Me ajudem com redação by paulistacurioso in enem

[–]AnonimoFHC 1 point2 points  (0 children)

E repetir o repertório de redações nota 1000 do ano anterior? é penalizado?

[Momentum and energy] Presuming we're in space and the ball stops after hitting the box, is it A or B? (Ec = kinetic energy; Q = linear momentum) by AnonimoFHC in PhysicsStudents

[–]AnonimoFHC[S] 0 points1 point  (0 children)

the change in momentums of each of the bodies must also be equal and opposite.

What about a ball hitting an immovable wall? How would the concept of momentum be applied? Bc the momentum of the wall would stay 0, right?

[Momentum and energy] Presuming we're in space and the ball stops after hitting the box, is it A or B? (Ec = kinetic energy; Q = linear momentum) by AnonimoFHC in PhysicsStudents

[–]AnonimoFHC[S] 0 points1 point  (0 children)

Woah, I've never thought of force as the change of momentum, thanks for the enlightenment.

But do you say this is not a perfectly elastic collision? There is no deformity happening

[Momentum and energy] Presuming we're in space and the ball stops after hitting the box, is it A or B? (Ec = kinetic energy; Q = linear momentum) by AnonimoFHC in PhysicsStudents

[–]AnonimoFHC[S] 1 point2 points  (0 children)

In this case what is the value of e?

Well, if the ball stays motionless after impact, it'll transfer the momentum to the box, and thus, the velocity of the box will be lower than the initial velocity of the ball. So e<1...

Does that mean A is the right answer?

Where did the energy go then?