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Hmm. Even so, I'm still not very clear at all on how this would work! So if I leave the circuit intact how would the equation for the current on the ammeter be derived? What does this have to do with the maximum resistance of the variable resistor? (15 ohms)

Hi! It doesn't explicitly say it but it asks you to draw a diagram of the circuit with the ammeter and voltmeter in correct positions in c). Here's how that diagram looks in the answers! + the answer to b).

Homework Statement HI! IB physics exams coming up and I'm having real trouble with potentiometers. The two questions I'm posing are in the attachment along with a picture of the circuit they include. The Attempt at a Solution What I'm having trouble with is the 2nd question, What is the...

Hmm. Velocity and mass. Which are cosntant...! So kinetic energy doesn't change to another form of energy, then?

Homework Statement Hi! In the attachment :) The Attempt at a Solution Okay! By looking at the question I would've intuitively guessed that the answer would've been perhaps A. gravitational energy→kinetic energy! But then I thought of the P=F*v formula. If the elevator is going down at a...

Gosh! Physics sure makes sense when you understand how it all comes together. Allright well that about covers it :) I understand the problem, at last! Thankyou so much for your help covering all these tedious questions!

Ok! I would think that the string with the greatest tension will be the one that is directly attached to the ceiling, intuitively, anyways! So if i look at the bottom mass gravity would be acting on it and therefore the tension needs to counteract this force so, weight=Tension of first string...

I'm slowly latching on to the idea, I think the problem lies in that tension is a little elusive to me. I feel rather silly, but yeah. I understand that on two adjacent blocks the string tension pulling them will be in opposite directions and be equal, right? Okay.. So that would mean that for...

My... Lemme think. That just opens to more confusion. I would think the tension is pulling in the same direction... God! Well. if they're pulling in opposite directions then Zero. but it still doesn't make much sense to me xd

Homework Statement In the attachment! This is a multiple choice question where you have to choose one of the strings. Intuitively I chose Z as I would think that in the first fraction of time it would feel the force acting on it first. However, if this wasn't a multiple choice I...

Thankyou so much for your replies! It's helped me tremendously! :) I've wrapped my head around it now.

Homework Statement In the attachment! The Attempt at a Solution My big hangup in this situation is why T, the period, of the oscillation doesn't change? If you increase the displacement by 2A does this mean that since the force acting on the spring also increases proportionally there's...

I always thought of KE as the work done in giving the object energy. So why can't one calculate the power using the kinetic energy formula/time, if gain in KE is nothing but work?

Hi! You're right. I ought to write out my equations a little more properly. I've gone over the problem and think I'm getting to grips with understanding it. There's just one question that really still bugs me. If kinetic energy is the work done in giving an object a certain velocity, can I...

Homework Statement In the attachment! Homework Equations P=F*v=F*d/t=Work/t KE=(mv^2)/2 W=f*s The Attempt at a Solution For the first question, I Found it rather difficult to figure out WHAT exactly accelerated the sand. I would simply say the force of the engine? But at the same...

Aha! I follow. so it doesn't necessarily have to be the first harmonic, but they will definitely be in series? I've looked at it a little more and I think it's finally embedded itself into my brain. Thankyou for your help!

Hi! being quite a simpleton, I found the answer a bit confusing. I understand that as the pipe is lowered standing waves will be produced... I also get that f is constant as the tuning fork held determines what possible lengths that cause the louder sounds. Why will the frequency be equal to...

Homework Statement Shown in the picture attachment. The Attempt at a Solution Hello! with this question I am just completely lost. I haven't the slightest clue how to get started. Anybody care to explain why the answer is D? (I've looked at the markscheme..)

Hey! I just looked at the question and gave it a good look again. Turns out that the vectors did add vectorally to equal zero. A bit of an optical illusion to me. Thanks anyways! Sorry for wasting your time! :) And yes, tis IB physics indeed. ;)

Homework Statement Hi! My question is about oscillation. The multiple choice answers and question is included in the picture attached! I also happen to know the answer is A by looking at the marscheme. The Attempt at a Solution I would've thought that since the ball is said to be held...

Two long, parallel wires are separated by a distance of 1.0 m. The current in each wire is 1.0 A. Which of the following is the magnitude of the force on 1.0 m length of each wire? A. 2π×107 N B. 2×107 N C. 2π×10–7 N D. 2×10–7 N Homework Equations Force on wire= B field density * Length...

Hi! Thankyou so much for the surprisingly quick response! utterly delighted ^^ Okay. I understand the notion that if F*v is a constant then force must be getting smaller as velocity increases. But why is this? intuitively i feel like the force on the car must just be constant throughout. Is...

Hi! I'm extremely confused by this problem. A car of mass 1200 kg starts from rest and travels along a horizontal straight road. The engine of the car develops a constant power of 54 kW. All the energy produced by the engine goes into increasing the kinetic energy of the car. The questions...