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VladimirAG [237]
3 years ago
14

Science help please! Urgent!

Physics
2 answers:
iren2701 [21]3 years ago
3 0
I<span>n </span>direct current<span> (</span>DC), the electric charge (current<span>) only flows in one direction. Electric charge in </span>alternating current<span> (</span>AC<span>), on the other hand, changes direction periodically. The voltage in </span>AC<span> circuits also periodically reverses because the </span>current<span> changes direction.</span>
Karo-lina-s [1.5K]3 years ago
3 0
26) The force felt py a charged particle in a magnetic field is given by Lorentz force:
F=q(vxB) where q is charge, v is velocity, and B is the field vector.
Positive particles have positive charge +q
Negative particles have negative charge -q
So the forces are in opposite directions (they spiral in opposite directions).

27) The coil of a galvanometer is put in a constant magnetic field.  When a current, I, is passed through the coil it creates a magnetic moment M=NIA where N is the turns of wire, A is the area of the loop, and I is current.  This moment feels a torque in the field is MxB  where "x" is the cross product.  So the coil is rotated in the field by an amount proportional to its current.

28) DC travels in one direction only.  AC changes directions twice per period. This makes it possible to transform the voltage later on, since Faraday's law requires the magnetic field created by a current to be changing in time.  This is the main reason we use AC


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When you cook a marshmallow on a metal poker tool over an open flame, energy is transferred. Identify the three different ways t
sergejj [24]

Answer:

The three ways thermal energy is transferred are;

1) Conduction

2) Convection

3) Radiation

Explanation:

1) The conduction of the heat from the open flame to the marshmallow is through the direct contact of the flame with the marshmallow, such that the flame the region of the combustion reaction, that produces light and heat touches the marshmallow

2) The convection process is the transfer of heat from the rising heated combustion products, as well as the heated air that rises from the flame

3) The radiation heat transfer is the transfer of the heat from the fire to the marshmallows directly by the heat the moves in the form of electromagnetic waves at temperatures above 1000 K, without the need for a medium, such that the marshmallow can be heated by the heat coming from side of the flame.

4 0
3 years ago
Where are you likely to find the oldest oceanic crust?
Stells [14]

Answer:

it would be letter E. near oceanic ridges

Explanation:

new ocean crust is formed at the mid ocean ridges

4 0
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When velocity is positive and acceleration is negative, what happens to the object’s motion?
xenn [34]

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<span>The moon is smaller and more dense than the Earth, and has less extreme temperature changes. The statement presented is True. In terms of temperature, since there is no atmosphere on the moon, then it has less extreme temperature changes. The moon can reach 253 Fahrenheit in the day and -387 Fahrenheit at night.</span>
8 0
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1) metal
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