Physics, 23.04.2020 04:38 ricardoamora54

(a) The distance to a star is approximately 8.64 ✕ 1018 m. If this star were to burn out today, in how many years would we see it disappear? years (b) How long does it take sunlight to reach Earth? minutes (c) How long does it take for a microwave radar signal to travel from Earth to the Moon and back? (The distance from Earth to the Moon is 3.84 ✕ 105 km.) s

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Answer from: robyn88

A. 922 yrs

B. 8.21mins

C. 2.56 seconds

Explanation:

Pls refer to attached file

(a) The distance to a star is approximately 8.64 ✕ 1018 m. If this star were to burn out today, in h

Answer from: einsigcn8481

(a) 913.874 Years.

(b) 8 minutes.

Explanation:

(a) Following Equation relates Distance to Velocity and time.

$$S = Vt$$ (S is for Distance,

in it we have.

S = $8.64*10^{18}m$ , V = 299792458m/s (Velocity of Light).

t = ?

Rearranging and solving for time gives us. t = $2.881993788*10^{18}seconds.$

which when converted to years , we have t = 913.874years, that is how long it will take for us to notice that the star has been burned out.

(b) it take 8 minutes for sun light to reach earth, how.? because distance from earth to sun is 150.46 million Km. doing same calculations as in (a) gives us 8 minutes.

using same logic as in (a) and (b) we get t = 2.56177 seconds. that is how long light takes to reach moon and come back.

Answer from: Quest

Acetic acid /əˈsiːtɪk/, systematically named ethanoic acid /ˌɛθəˈnoʊɪk/, is a colourless liquid organic compound with the chemical formula ch3cooh (also written as ch3co2h or c2h4o2). when undiluted, it is sometimes called glacial acetic acid. vinegar is no less than 4% acetic acid by volume, making acetic acid the main component of vinegar apart from water. acetic acid has a distinctive sour taste and pungent smell. in addition to household vinegar, it is mainly produced as a precursor to polyvinyl acetate and cellulose acetate. it is classified as a weak acid since it only partially dissociates in solution, but concentrated acetic acid is corrosive and can attack the skin.acetic acidnamespreferred iupac nameacetic acidsystematic iupac nameethanoic acidother namesvinegar (when dilute); hydrogen acetate; methanecarboxylic acid[1][2]identifierscas number64-19-7 3d model (jsmol)interactive image3dmetb00009 reference506007chebichebi: 15366 chemblchembl539 chemspider171 drugbankdb03166 echa infocard100.000.528ec number200-580-7e numbere260 (preservatives)gmelin reference1380iuphar/bps1058keggd00010 meshacetic+acidpubchem cid176rtecs numberaf1225000uniiq40q9n063p un number2789inchiinchi=1s/c2h4o2/c1-2(3)4/h1h3,(h,3,4) key: qtbsbxvteameqo-uhfffaoysa-n smilescc(o)=o

Answer from: Quest

It's have to be 12 or idk

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(a) The distance to a star is approximately 8.64 ✕ 1018 m. If this star were to burn out today, in h...

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