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4 years ago

10

in your own words provide two advantages of using meters as a measurement of length rather than old measurements of length such

as hands or steps

1 answer:

Klio2033 [76]4 years ago

5 0

Answer:

it is accepted all over the world

it is more reliable than other kinds of measuring system

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Calculate the potential difference if 80J of energy are transferred by 20C of charge.

olga_2 [115]

Using the equation:

Energy transferred = Charge x Potential difference

Rearrange for p.d:

V = E/Q

Substitute values:

V = 80/20

V = 4

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3 years ago

What happens to a solid when thermal energy is added?

GalinKa [24]

This happens at the boiling temperature of every substance that can vaporize<span>. At the </span>boiling temperature<span>, </span>adding heat energy converts the liquid into a gas WITHOUT RAISING THE TEMPERATURE<span>.The </span>same thing happens when a solid changes into liquid<span>. For </span>instance<span>, </span>ice and water can exist<span> together at the melting </span>temperature<span>.</span>

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3 years ago

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Metals are good conductors of electricity because __________ . A) they are easily reduced and oxidised. B) they are easily ionis

Advocard [28]

Answer:

a

Explanation:

because they are easily reduced and oxidised

3 0

3 years ago

In this problem you will consider the balance of thermal energy radiated and absorbed by a person.Assume that the person is wear

Alekssandra [29.7K]

Answer:

The thermal power emitted by the body is $P_t = 286.8 \ Wm^{-2}$

The net power radiated is $P_{net} = 460 \ W$

Explanation:

From the question we are told that

The length of the assumed hum $T_{room} = 20 ^oC$ an body is L = 2.0 m

The circumference of the assumed human body is $C = 0.8 \ m$

The Stefan-Boltzmann constant is $\sigma = 5.67 * 10^{-8 } \ W\cdot m^{-2} \cdot K^{-4}.$

The temperature of skin $T_{body} = 30^oC$

The temperature of the room is

The emissivity is e=0.6

The thermal power radiated by the body is mathematically represented as

$P_t = e * \sigma * T_{body}^4$

substituting value

$P_t = 0.6 * 5.67*10^{-8} * (303)^4$

$P_t = 286.8 \ Wm^{-2}$

The net power radiated by the body is mathematically evaluated as

$P_{net} = P_t * A$

Where A is the surface area of the body which is mathematically evaluated as

$A = C* L$

substituting values

$A = 0.8 * 2$

$A = 1.6 m^2$

=> $P_{net} = 286.8 * 1.6$

=> $P_{net} = 460 \ W$

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4 years ago

In what region of the em spectrum is each?

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