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3 years ago

HELP ASAP PLS. ILL GIVE BRAINLIEST

Physics

1 answer:

Blizzard [7]3 years ago

4 0

Answer:

I'm not completely sure, but I believe the first and third of the three are mechanical.

Explanation:

Chemical potential isn't moving or about to go into motion. It can't be mechanical.

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How is the direction of current defined by convention

ddd [48]

Answer: The direction of an electric current is by convention the direction in which a positive charge would move. Thus, the current in the external circuit is directed away from the positive terminal and toward the negative terminal of the battery. Electrons would actually move through the wires in the opposite direction.

Explanation:

8 0

3 years ago

When a machine is used to do work, the force applied by the machine is called the effort force?

nignag [31]

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3 years ago

It takes a photon 8 minutes and 25 seconds ro reach earth. What is the distance (labeled 1 au) in meter between the sun and eart

tangare [24]

Answer:

$x=0.017 AU$

Explanation:

We can use the equation of speed in terms of distance. We know that the speed of light is constant value so we will have:

$v=\frac{x}{t}$

$x=v*t$

$x=3*10^{8}*8.417$

$x=2.53*10^{9}m$

Now we know that $1 AU = 1.496*10^{11}m$

$x=0.017 AU$

I hope it helps you!

3 0

3 years ago

A power plant produces 1000 MW to supply a city 40 km away. Current flows from the power plant on a single wire of resistance 0.

nikitadnepr [17]

Answer:

Current = 8696 A

Fraction of power lost = $\dfrac{80}{529}$ = 0.151

Explanation:

Electric power is given by

$P=IV$

where I is the current and V is the voltage.

$I=\dfrac{P}{V}$

Using values from the question,

$I=\dfrac{1000\times10^6 \text{ W}}{115\times10^3\text{ V}} = 8696 \text{ A}$

The power loss is given by

$P_\text{loss} = I^2R$

where R is the resistance of the wire. From the question, the wire has a resistance of $0.050\Omega$ per km. Since resistance is proportional to length, the resistance of the wire is