What Supplies Do I Need for My Electromagnet Science Project?

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For the 10th-grade science fair project on electromagnets, key factors affecting strength include voltage, core diameter, wire thickness, and coil count. Suggested materials include insulated copper wire, a power source, a metal core, and a multimeter, which can be found at local electronics or hardware stores like Home Depot. Public transportation is recommended for those unable to drive, allowing access to necessary supplies. To enhance the project, consider experimenting with different variables and documenting results creatively. Proper planning and resourcefulness can lead to a successful and impressive science project.
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Homework Statement



I am the the 10th grade science fair, and my project is over electromagnets. It is which of
the following factors affects the strength of an electromagnet the most. I then use some like voltage of power source, diameter of core, thickness of wire, and # of coils. Could you guys give me all the materials that I would need, where to buy them and cost? Could you give me ideas as to how to make this project extraordinary? I know I am asking a lot, but my project is due soon, I am under stress from my other homework, and I am just afraid that I will do this wrong.

Please give any kind of feedback.


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The Attempt at a Solution



I can't go to store because dad is always at work. I really don't know what materials would make this project a good one.
 
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Why do you need your dad to go to the store? Buy some tickets, print out a map, and hop on public transit to visit the nearest electronics or hardware store. The Source is a good place to buy wire and multimeters if there's a store near you. For the metal core, you might try Home Hardware or Home Depot.
 
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}...
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