How Long Would It Take for a Water-Composed Earth to Heat from 40°C to 90°C?

  • Thread starter Thread starter tanzerino
  • Start date Start date
  • Tags Tags
    Earth
AI Thread Summary
The discussion centers on calculating the time required for a water-composed Earth to heat from 40°C to 90°C, given that it absorbs 1.27X10^17W of solar energy. The specific heat of water is noted as 4.186J/g°C, and the Earth's volume is 1.08X10^27 m^3. Various time estimates are proposed, including options ranging from 56 years to 5.7x10^5 years. A participant expresses confusion over previous calculations related to a similar scenario with different initial temperatures. The thread seeks clarification on the correct answer and methodology for this heating scenario.
tanzerino
Messages
48
Reaction score
0
1. The Earth intercepts 1.27X10^17W of radiant energy from the Sun. Suppose the Earth, of volume 1.08X10^27 m^3, was composed of water. How long would it take for the Earth at 40 celciues to reach 90 celcius , if none of the energy was radiated or reflected back out into space?
The specific heat of water is 4.186J/g c

a-5.7x10^5 y
b-5.26x10^4 y
c-110.8 y
d-5.04x10^7 y
e-56 y


This is the same one with one different number from 40c instead of 20c i calculated and still wrong i guess its a?
 
Physics news on Phys.org


Any idea?
 

Thread 'Errors and significant figures'

I multiplied the values first without the error limit. Got 19.38. rounded it off to 2 significant figures since the given data has 2 significant figures. So = 19. For error I used the above formula. It comes out about 1.48. Now my question is. Should I write the answer as 19±1.5 (rounding 1.48 to 2 significant figures) OR should I write it as 19±1. So in short, should the error have same number of significant figures as the mean value or should it have the same number of decimal places as...
View full post »
Thread 'A cylinder connected to a hanging mass'

Thread 'A cylinder connected to a hanging mass'

Let's declare that for the cylinder, mass = M = 10 kg Radius = R = 4 m For the wall and the floor, Friction coeff = ##\mu## = 0.5 For the hanging mass, mass = m = 11 kg First, we divide the force according to their respective plane (x and y thing, correct me if I'm wrong) and according to which, cylinder or the hanging mass, they're working on. Force on the hanging mass $$mg - T = ma$$ Force(Cylinder) on y $$N_f + f_w - Mg = 0$$ Force(Cylinder) on x $$T + f_f - N_w = Ma$$ There's also...
View full post »

Similar threads

How Long Would It Take for Earth's Temperature to Rise from 20°C to 90°C?
Replies
18
Views
6K
How Much Steam Is Needed to Heat Water from 24°C to 90°C?
Replies
1
Views
3K
How Long Would It Take for Earth to Reach 100°C?
Replies
3
Views
5K
Calculating Time to Heat Earth to 100°C
Replies
1
Views
2K
How Long Does It Take for an Aluminum Cube to Warm from 10°C to 20°C?
Replies
4
Views
3K
How long does it take to boil water in a 600 watt microwave oven?
Replies
21
Views
13K

Hot Threads

Recent Insights

Back
Top