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balu736 [363]
3 years ago
9

HELPPPPP !!!! What must be true about two objects if heat is flowing between them? The objects must be different temperatures. T

he objects must be the same temperature. The objects must both be over room temperature. The objects must both be under room temperature.
Physics
2 answers:
geniusboy [140]3 years ago
8 0

The objects must be different temperatures. the exact temperatures don't matter

Fynjy0 [20]3 years ago
7 0

Different temperatures must be true about two objects if heat is flowing between them

Answer: Option A

<u>Explanation: </u>

On bringing two objects with temperature differences, heat flows from a higher temperature to a lower temperature until there is thermal equilibrium according to the second law of thermodynamics.

Just like if we connect two tanks through a pipe with different water capacities. The water flows from the tank of higher water to a lower water level until both the tanks have the same water level.

The bigger the difference of temperature between two object, the higher the rate of heat flow from the hotter object to the cooler one.  Two object, having same temperature doesn’t undergo a heat flow process.

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The moons of Mars, Phobos (Fear) and Deimos (Terror), are very close to the planet compared to Earth's Moon. Their orbital radii
tankabanditka [31]

Answer:

0.2528

Explanation:

To calculate the period we need the formula:

T=\frac{2\pi r^{3/2}}{\sqrt{GM}}

Where r is the radius of the moon, G is the universal constant of gravitation and M is the mass of mars.

The period of Phobos:

T_{p}=\frac{2\pi r_{p}^{3/2}}{\sqrt{GM}}

The period of Deimos:

T_{D}=\frac{2\pi r_{D}^{3/2}}{\sqrt{GM}}

The ratio of the period of Phobos and Deimos:

\frac{T_{p}}{T_{D}}=\frac{\frac{2\pi r_{p}^{3/2}}{\sqrt{GM}}}{\frac{2\pi r_{D}^{3/2}}{\sqrt{GM}}}

\frac{T_{p}}{T_{D}}=\frac{\sqrt{GM}2\pi r_{p}^{3/2}}{\sqrt{GM}2\pi r_{D}^{3/2}}

Most terms get canceled and we have:

\frac{T_{p}}{T_{D}}=\frac{r_{p}^{3/2}}{r_{D}^{3/2}}

According to the problem

r_{p}=9,378km\\r_{D}=23,459km

so the ratio will be:

\frac{T_{p}}{T_{D}}=\frac{(9,378)^{3/2}}{(23,459)^{3/2}}=\frac{908166.22}{3593058.125}=0.25275 ≈ 0.2528

the ratio of the period of revolution of Phobos to that of Deimos is 0.2528

8 0
3 years ago
The Sun travels in a circular orbit at a velocity of 220 km/second at a distance of 8.5 kiloparsecs from the center of the Galax
Marrrta [24]

Answer:

2.353 × 10⁵ years

Explanation:

Since speed, v = distance/time

time, t = distance/speed

The distance, d = circumference of orbit = 2πr where r = radius of orbit = 8.5 kiloparsecs = 8.5 kiloparsecs × 3.1 × 10¹³ kilometers/parsec = ‭26.35‬ × 10¹³ kilometers and velocity of sun, v = 220 km/s

So, the time it takes to complete one orbit, T is

T = 2πr/v

= 2π × 26.35‬ × 10¹³ km/220 km/s

= 165.562  × 10¹³ km ÷ 220 km/s

= 0.753 × 10¹³ s

= 7.53 × 10¹² s

We now convert T to years

T = 7.53 × 10¹² s ÷ 3.2 × 10⁷ seconds/year

T = 2.353 × 10⁵ years

8 0
3 years ago
PLEASE HELP!!!!!!!!!!!
Alexxandr [17]
I am 100% sure its A.
5 0
3 years ago
Read 2 more answers
Stars originate as large bodies of slowly rotating gas.Because of gravity, these clumps of gas slowly decrease in size.The angul
Tamiku [17]

Answer:

E.) conservation of angular momentum

Explanation:

The angular momentum is defined as:

L=r x mv

where r is the radius of the star, m is the mass and v the angular velocity.

and angular momentum is an amount that is conserved, so the angular momentum before the star is compressed must be equal to the angular momentum after the star was compressed:

r_{1} x mv_{1}=r_{2} x mv_{2}

the second radius is smaller than the first radius, since the star shrinked, the second angular velocity must be greater that the first.

In other words, the angular velicity increases as the star shrinks because of the conservation of angular momentum.

4 0
3 years ago
archaeologists use radioactive decay of an isotope of the element because it has a fairly short half-life and is found in anythi
natulia [17]

Archaeologists use radioactive decay of an isotope of the element <u>carbon.</u> Because it has a fairly short half-life, and is found in anything that was once living.

<h3>What is radioactivity?</h3>

The act of producing radiation spontaneously is known as radioactivity. This is accomplished by an unstable atomic nucleus that want to give up some energy in order to move to a more stable form.

Archaeologists use radioactive decay of an isotope of the element <u>carbon.</u> Because it has a fairly short half-life, and is found in anything that was once living.

Hence, <u>carbon</u> is used the correct answer for the blank.

To learn more about the radioactivity, refer  to the link;

brainly.com/question/1770619

#SPJ1

7 0
2 years ago
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