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3 years ago

What do scientists use to determine the temperature of a star?

Physics

2 answers:

larisa86 [58]3 years ago

7 0

Answer:

Color

Explanation:

The most common way of determine the temperature of a star is by studying its spectrum. The light coming from the star is measured in two filters: red and blue. The ratio of the two readings give us the temperature of the stars.

Cooler stars will appear red in color and hotter stars will appear blue.

For a layman if the star is blue it is a hot star and if its red it is a cold star.

Vera_Pavlovna [14]3 years ago

4 0

Thermal Imaging. Hope it helps.

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Different satellites orbit the earth with a vast range of altitudes, from just a couple hundred km, all the way to tens of thous

fenix001 [56]

Answer:

a) v = 7.69 10³ m / s, b) T = 92.6 min

Explanation:

a) For this exercise we use the centripetal acceleration ratio, which in itself assumes a circular orbit, is equal to the acceleration of gravity

a = v² / r

v = $\sqrt{a r}$

the distance to the ISS is

r = R_earth + d

r = 6400 10³ + 400 10³

r = 6800 10³ m

we calculate

v = $\sqrt{8.69 \ 6800 \ 10^3}$ Ra (8.69 6800 103)

v = $\sqrt{59.09 \ 10^6}$

v = 7.687 10³ m / s

the result with the correct significant figures

v = 7.69 10³ m / s

b) The speed of the ISS is constant, so we can use the uniform motion relationships

v = d / t

if distance is the orbit distance

d = 2π r

time is called period

v = 2π r / T

T = 2π r / v

let's calculate

T = 2π 6800 10³ /7,687 10³

T = 5.558 10³ s

let's reduce the period to minutes

T = 5.558 10³ s (1 min / 60s)

T = 9.26 10¹ min

T = 92.6 min

3 0

2 years ago

A man is standing on a platform that is connected to a pulley arrangement, as the drawing shows. By pulling upward on the rope w

leonid [27]

Answer:

The pulling force that the man should apply to create an upward acceleration of $1.20m/s^{2}$ is $P=621.5N$

Explanation:

As it shows in the drawing at the end, we have that the total mass of the man plus the platform is $113 kg$ , then the force downward $W$ is $W=mg=113Kg*9.8m/s^{2}=1107.4N$ .

Due the man needs to do a pulling force upward capable of lifting himself and the platform with an acceleration of $1.20m/s^{2}$ , this force should create an acceleration greater than gravity by $1.20m/s^{2}$ . then $a_{up}=g+1.2m/s^{2}=9.8m/s^{2}+1.2m/s^{2}=11m/s^{2}$ . Therefore the force should be $P_{up}=ma_{up}=113kg*11m/s^{2}=1243N$ .

Finally, as we have a pulley arrangement connected to the platform, it gives the man a mechanical advantage, so he has to do only half of that upward force

, therefore $P=\frac{1243N}{2}=621.5N$ .

8 0

2 years ago

The frequency, or number of waves that pass a given point per second, of

BaLLatris [955]

Answer:

Hertz is the answer for this question

5 0

1 year ago

Mr. Fineman rolls a tennis ball off his desk. If his desk is 1 m tall, and the tennis ball is rolling off of his desk at a speed

Brums [2.3K]

Answer:

The URL you requested has been blocked

The page you requested has been blocked because it contains a banned word.

URL: https://www.scribd.com/document/359448624/Solutions-Manual-pdf

User name: 22035460

Group name: HS-Students

Explanation:i really tryed but my school blocks us from learning but heres the link https://www.scribd.com/document/359448624/Solutions-Manual-pdf

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2 years ago

A rod has a radius of 10 mm is subjected to an axial load of 15 N such that the axial strain in the rod is ????௫ = 2.75*10-6, de

EleoNora [17]

Answer:

Knowing we only have one load applied in just one direction we have to use the Hooke's law for one dimension

ex = бx/E

бx = Fx/A = Fx/π $r^{2}$