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Scholar
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posted by  Rosebudsigep on 6/11/2008 9:26:41 PM  |  status: Live  

Physics help

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General Physics N/A N/A N/A
Question Details:
This question seems easy but my tutor argued with me about it today and I'm seeing if I'm right. Thanks for the help!!!

The radius of the moon (assumed spherical) is 1.74 x 10^3 km, and its mass is 7.35 x 10^22 kg .What is the density of the moon in appropriate significant figures in grams per cubic centimeter?
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Sage
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posted by SamiLiLOnE on 6/11/2008 9:40:35 PM  |  status: Live
Asker's Rating: Somewhat Helpful   
Rosebudsigep's comment:
"Unfortunately, this answer was incorrect. No harm no faul though... thanx for responding."
Response Details:
V = 4/3 πr3 = (4/3)(π)(1.74 x 107 cm)3 = 2.207 x 1022 cm3
m = 7.35 x 1025 g

ρ = m/V = (7.35 x 1025 g)/(2.207 x 1022 cm3) = 0.0206 g/cm3

Sage
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posted by SamiLiLOnE on 6/16/2008 7:55:04 PM  |  status: Live
Asker's Rating: Lifesaver   
Rosebudsigep's comment:
"Good correction"
Response Details:
Oops, sorry. Idk what I did wrong, and I know it's a little late, but I hate not answering things correctly lol. See if this works,

V = (4/3)πr3 = (4/3)(π)(1.74 x 103 km)3 = 2.21 x 1010 km3

ρ = m/V
ρ = (7.35 x 1022 kg)/(2.21 x 1010 km3)
ρ = 3.33 x 1012 kg/km3

3.33 x 1012 kg x 1 km3        x 1000 g = 3330 g/cm3
        km3          (104)3 cm3         kg

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