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3 years ago

9

O conceito de temperatura vem sendo modificado ao longo dos anos. A ciência contemporânea classifica a temperatura como uma medi

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1 answer:

zavuch27 [327]3 years ago

3 0

Answer:

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Explanation:

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What is the relationship between electric currents and magnetic fields?

Aleksandr [31]

The electric currents induces a magnetic field. They changing magnetic field can be induce an electric current.

7 0

4 years ago

A filamentary conductor is formed into an equilateral triangle with sides of length carrying current i . find the magnetic field

arsen [322]

magnetic field due to a finite straight conductor is given by

$B = \frac{\mu_0 i}{4\pi r}(sin\theta_1 + sin\theta_2)$

here since it forms an equilateral triangle so we will have

$\theta_1 = \theta_2 = 60 degre$

also the perpendicular distance of the point from the wire is

$r = \frac{a}{2\sqrt3}$

now from the above equation magnetic field due to one wire is given by

$B = \frac{\mu_0 i}{4\pi \frac{a}{2\sqrt3}(sin60 + sin60)$

$B = \frac{\mu_0 i*2\sqrt3}{4\pi a}(\sqrt3)$

$B = \frac{3\mu_0 i}{2\pi a}$

now since in equilateral triangle there are three such wires so net magnetic field will be

$B = \frac{9\mu_0 i}{2\pi a}$

5 0

3 years ago

A constant braking force of 10 newtons applied for 5 seconds is used to stop a 2.5-kilogram cart traveling at 20 meters per seco

ss7ja [257]

Mathematically it can be expressed as: I = FpΔt. Where F p is the average magnitude of the acting force and Δt = t 2 - t 1, the time lapse in the force acts.
The magnitude of the impulse applied to stop the cart is
I = FpΔt = (10N) * (5s) = 50 N.s

6 0

3 years ago

Read 2 more answers

Which phenomena did Michael Faraday explore to help him invent the motor and the generator?

Vlad [161]

Hey

Michael Faraday did lot of work on 'Electricity and magnetism '
He postulated 3 laws of 'Electromagnetic induction'

motor and generator are works on these principles /laws.

thanks for asking

6 0

3 years ago

Read 2 more answers

What energy change is associated with the reaction to obtain one mole of H2 from one mole of water vapor? The balanced equation

Yakvenalex [24]

Answer:

ΔH = 249 kJ/mol

Explanation:

The balanced reaction is:

2H₂O(g) → 2H₂(g) + O₂(g) (1)

To calculate the energy change to obtain one mole of H₂(g) from one mole of H₂O(g), the coefficients of the reaction (1) must be halved:

H₂O(g) → H₂(g) + 1/2O₂(g) (2)

The enthalpy of the reaction (2) is given by:

$\Delta H = \Delta H_{r} - \Delta H_{p}$

<em>Where $\Delta H_{r}$ : is the bond enthalpy of reactants and $\Delta H_{p}$ : is the bond enthalpy of products.</em>

<u>For the reactants we have the next bond energies:</u>

2 x (H-O) = 2 x (467)

<u>And the bond energies for the products are:</u>

H-H + (1/2) (O=O) = 436 + (1/2)(498)

So, the enthalpy of the reaction (2) is:

$\Delta H = 2 \cdot 467 kJ/mol - 436 kJ/mol - \frac{1}{2} \cdot 498 kJ/mol = 249 kJ/mol$

I hope it helps you!

3 0

3 years ago