Physics: Discussion, Questions & Potential Solutions

[Theodric_Ironfist]

It was not accelerating 

It doesn't say that. You can have constant speed and still be accelerating, ie. uniform circular motion.

[KiNSKi01]

Yeah lol pretty sure it didn’t say that it wasn’t accelerating

[Richard Feynman 101]

It doesn't say that. You can have constant speed and still be accelerating, ie. uniform circular motion.

For simplicity VCAA doesn't deal with that (or else componets of tangents are involved) constant speed simply no change in velocity. You are spot on though. an object  moving in a circle at a constant speed can be accelerating since the direction of velocity changes tangential (more Uni stuff that) but full marks to u theodore.

[KiNSKi01]

Yo why in the wave question is the midpoint between B and A a point of constructive interference? I thought completel destructive interference would occur here

[aussiboi]

what was the experimental error thing on mc and what was uncertainity answer

[Theodric_Ironfist]

For simplicity VCAA doesn't deal with that (or else componets of tangents are involved) constant speed simply no change in velocity.

Do you have a source for that? Big if true

[mzhao]

Yo why in the wave question is the midpoint between B and A a point of constructive interference? I thought completel destructive interference would occur here

Think about it in terms of path difference. The midpoint has a P.D. of 0, so therefore the two waves constructively interfere.

[Theodric_Ironfist]

what was the experimental error thing on mc and what was uncertainity answer

https://www.vcaa.vic.edu.au/Pages/vce/adviceforteachers/physics/mis_uncertainity_errors.aspx

[KiNSKi01]

Think about it in terms of path difference. The midpoint has a P.D. of 0, so therefore the two waves constructively interfere.

Yeah but if u think of it as a standing wave being formed, the mid point would be a node right?

[Theodric_Ironfist]

Yeah but if u think of it as a standing wave being formed, the mid point would be a node right?

Forget standing waves, it's not really the situation here. It's just a path difference question, and in the middle the path difference is zero corresponding to an antinode.

[Seno72]

Why did you guys have the force on A by B (or whatever it was)? Was it 8 N

[Theodric_Ironfist]

Why did you guys have the force on A by B (or whatever it was)? Was it 8 N

Yup

[lolno]

Why did you guys have the force on A by B (or whatever it was)? Was it 8 N

I had nooooo idea but I put 40N for the first question
Then because of "action-reaction" 40N and to the left

So I (hope) because I recognized newton's third law and just repeated the answer (even if it's wrong) and changed the direction I get 2/3??

[Theodric_Ironfist]

I had nooooo idea but I put 40N for the first question
Then because of "action-reaction" 40N and to the left

So I (hope) because I recognized newton's third law and just repeated the answer (even if it's wrong) and changed the direction I get 2/3??

Pushing force on the whole 5 kg system is 40 N, giving the system acceleration 40/5 = 8 m/s/s.

Then just looking at block B (1 kg), it must have a net force acting on it of F = ma = 1 x 8 = 8 N. This net force is completely provided by the contact of block A. So F(A on B) is 8 N, and by N3, F(B on A) is also 8 N but to the left. (IIRC)

[aussiboi]

Why wasnt it 32 N? I thought Block A exerts 4 x 8 N ??