Add or subtract as indicated:

Imagine that the Earth had no atmosphere and was covered with a material that was a perfect thermal insulator (and zero thermal

Butoxors [25]

Answer:

$T_{12 \ pm} = 360 \ K$

$T_{3 \ pm} = 330 \ K$

$T = 131\ K$

Explanation:

The power of sunlight at equator $L_{sun}$ is known to be = $3.846*10^{26} \ W$

Distance = 1 Au = $1.496*10^{11} \ m$

Thus; the power at equator = $\frac{3.846*10^{26}}{4 \pi *(1.496*10^{11})^2}$

= 1367 W/m²

Now; at noon (sun overhead)

$1367* \frac{70}{100}= 5.67*20^{-8}*T^4\\\\T^4 =\frac{956.9}{5.67*10^{-8}}\\\\T^4 = 1.687*10^{10}\\\\T_{12 \ pm} = 360 \ K$

At 3 pm (Sun 45 degrees from overhead);

$1367* \frac{70}{100}*cos \ 45 = 5.67*20^{-8}*T^4\\\\T^4 =\frac{676.63}{5.67*10^{-8}}\\\\T^4 = 1.193*10^{10}\\\\T_{3 \ pm} = 330 \ K$

C) sunset and D) midnight.

We based our assumption on the notion that the incident angle at sunset and midnight be just below 90° ; for example . let say:

$T_{6pm \ to \ 6 am} = 1367* \frac{70}{100}*cos 89 = \sigma T^4\\ \\T = 131\ K$

5 0

2 years ago

When different resistors are connected in parallel across an ideal battery, we can be certain that: a) their equivalent resistan

sergeinik [125]

Answer:

b) the potential difference across each is the same.

Explanation:

When resistors are connected in parallel with each other

then the terminals of all the resistors will connected across the terminals of the battery

So we know the potential difference of the battery is same across all the resistors

So we can say that the equivalent resistance of all the resistance is

$\frac{1}{R} = \frac{1}{R_1} + \frac{1}{R_2} + \frac{1}{R_3}$

so its not the mean of all resistors

also we know that the resistance are all different so power across each resistance is different given as

$P = \frac{V^2}{R}$

also current in each resistance is also different and given by

$i = \frac{V}{R}$

so correct answer will be

b) the potential difference across each is the same.

5 0

2 years ago

The nucleus of an atom consists of neutrons and electrons. tf

yKpoI14uk [10]

True because the neutrons are inside of the nucleus and the electron revolve around the nucleus

3 0

2 years ago

Read 2 more answers

A _ increases it decreases voltage in a power line

Levart [38]

A transformer increases and decreases voltage.

5 0

2 years ago

What is the relationship between radio waves and the visible spectrum

evablogger [386]

Answer:

They both are part of electromagnetic radiation.

Radio waves have longer wavelength than visible waves.

Radio waves have lower frequency than visible waves.

Explanation:

8 0

2 years ago