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const2013 [10]
3 years ago
7

What are two types of electric currents?

Physics
1 answer:
s2008m [1.1K]3 years ago
6 0

Answer:

There are two different types of current in widespread use today. They are direct current, abbreviated DC, and alternating current, abbreviated AC. In a direct current, the electrons flow in one direction.

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At a certain instant, a rotating turbine wheel of radius RR has angular speed ωω (measured in rad/srad/s). What must be the magn
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Answer:

Explanation:

The magnitude of the acceleration makes an angle of 30° with the tangential velocity.

Resolving the acceleration to tangential and radial acceleration

at = aCos30 = √3a/2

ar = aSin30 = ½a

a = 2•ar

Then, the tangential acceleration is the linear acceleration, so the relationship between the tangential acceleration and angular acceleration is given as:

at = Rα

Then, α = at/R

since at = √3a/2

Then, α = √3 at/2R, equation 1

The radial acceleration is given as

ar = ω²R

Note that, at² + ar² = a²

at = √(a²-ar²)

Back to equation 1

α = √3 at/2R

α = √3√(a²-ar²)/2R

α = √3√(a²-(w²R)²)/2R

α = √3(a²-w⁴R²) / 2R

Also, a = 2•ar = 2w²R

Then,

α = √3((2w²R)²-w⁴R²) / 2R

α = √3(4w⁴R²-w⁴R²) / 2R

α = √3(3w⁴R²) / 2R

α = √9w⁴R² / 2R

α = 3w²R / 2R

α = 3w²/2

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As a person pushes a box across a floor, the energy from the person’s moving arm is transferred to the box, and the box and the
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Answer:

conserved

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what is the density of a material if its mass is 450 kilograms and occupies a volume of 25 centimeters cubed​
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Answer:

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Explanation:

In fact, most of what we would use to describe ourselves to others reflects this sort of information storage.   Much of this information is unique to the individual and hence may involve different mechanisms from those used for species-typical information storage.

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