Struggling with Questions 5, 7, & 8? Let me help!

  • Thread starter Thread starter StevenA
  • Start date Start date
AI Thread Summary
Questions 5, 7, and 8 are causing confusion, particularly regarding the reasoning behind the answers for question 5a and 5b, which are identified as south to north and west, respectively. There is a request for clarification on the basic laws governing current flow through a wire. The discussion also centers on question 8, where an iron rod is suggested as a strong permanent magnet, but it is clarified that it is not a permanent magnet. The conversation emphasizes the properties of iron that make it suitable for use in electromagnets and the importance of understanding how rods function within electromagnets. The need for confirmation and deeper comprehension of these concepts is highlighted throughout the discussion.
StevenA
Messages
3
Reaction score
0
ImageUploadedByPhysics Forums1363650627.277901.jpg
.

Need help with comprehending questions 5,7,and 8 please.
 
Last edited by a moderator:
Physics news on Phys.org
It would help if you told us exactly what you needed help with in each question. What don't you comprehend?
 
Well the answer for 5a is south to north and 5b is west but I don't know how the book came up with that answer. Also, in question 8 I chose an iron rod because it is a permanent magnet that's extremely strong for it's size, but I need conformation for my answer.
 
StevenA said:
Well the answer for 5a is south to north and 5b is west but I don't know how the book came up with that answer.

What does it say for the basic laws for current flowing through a wire?

Also, in question 8 I chose an iron rod because it is a permanent magnet that's extremely strong for it's size, but I need conformation for my answer.

Ah, but the iron rod ISN'T a permanent magnet! But what is it about iron that makes it good to use in an electromagnet? What does your book say about inserting rods into an electromagnet to form its core?
 

Thread 'Struggling to understand the concept of this question (ice cube in water optics question)'

TL;DR Summary: I came across this question from a Sri Lankan A-level textbook. Question - An ice cube with a length of 10 cm is immersed in water at 0 °C. An observer observes the ice cube from the water, and it seems to be 7.75 cm long. If the refractive index of water is 4/3, find the height of the ice cube immersed in the water. I could not understand how the apparent height of the ice cube in the water depends on the height of the ice cube immersed in the water. Does anyone have an...
View full post »
Thread 'Variable mass system : water sprayed into a moving container'

Thread 'Variable mass system : water sprayed into a moving container'

Starting with the mass considerations #m(t)# is mass of water #M_{c}# mass of container and #M(t)# mass of total system $$M(t) = M_{C} + m(t)$$ $$\Rightarrow \frac{dM(t)}{dt} = \frac{dm(t)}{dt}$$ $$P_i = Mv + u \, dm$$ $$P_f = (M + dm)(v + dv)$$ $$\Delta P = M \, dv + (v - u) \, dm$$ $$F = \frac{dP}{dt} = M \frac{dv}{dt} + (v - u) \frac{dm}{dt}$$ $$F = u \frac{dm}{dt} = \rho A u^2$$ from conservation of momentum , the cannon recoils with the same force which it applies. $$\quad \frac{dm}{dt}...
View full post »

Similar threads

LASER Applications help please
Replies
4
Views
690
Momentum Conservation: Bullet enters a block
Replies
2
Views
2K
Find the height of a lamp based on the velocities of projectiles
Replies
40
Views
2K
Loop equations for this battery-resistor circuit
Replies
48
Views
2K
Calculating the flux of a vector field
Replies
7
Views
1K
SOS -- Questions about mass, acceleration and velocity
Replies
4
Views
2K
An olympic long jumper question
Replies
3
Views
1K
Textbook 'The Physics of Waves': Calculating Work Done by Force
Replies
2
Views
876
Help with Thermodynamics assignment
Replies
1
Views
1K
MCNPX output proton energy is zero?
Replies
8
Views
665

Hot Threads

Recent Insights

Back
Top