Calculating Heat Energy & Temperature Change: Seeking Help!

AI Thread Summary
To calculate the heat energy required to melt the iceberg, one must consider its volume, density, and the heat of fusion for water. For the second problem, determining the time to raise the object's temperature involves calculating the energy needed based on its mass, specific heat, and the power output of the dryer. The discussion emphasizes the importance of understanding specific heat and heat of fusion concepts, suggesting that reviewing relevant textbook materials or online resources can aid in solving these problems. Engaging with these principles is crucial for grasping the calculations involved. Mastery of these topics can significantly enhance performance in the class.
Vigo
Messages
21
Reaction score
0
1.) An iceberg's volume is 2*10^6 m^3. If the temperature of the iceberg is is 250 K and the density is .9998 g/cm^3, how much heat energy would be required to competely melt it?

2.) An object weighs 500 grams and has a specific heat of 2 Joules/g C. The object absorbs 40% of the output of a 1200 watt dryer. How long will it take to raise the object's temperature from -10 C to 20 C?

Please help me with these problems. My teacher gave them to us for extra credit because he hasn't taught us how to do them. I could really use some extra credit in that class. Thanks.
 
Physics news on Phys.org
Vigo said:
1.) An iceberg's volume is 2*10^6 m^3. If the temperature of the iceberg is is 250 K and the density is .9998 g/cm^3, how much heat energy would be required to competely melt it?

2.) An object weighs 500 grams and has a specific heat of 2 Joules/g C. The object absorbs 40% of the output of a 1200 watt dryer. How long will it take to raise the object's temperature from -10 C to 20 C?

Please help me with these problems. My teacher gave them to us for extra credit because he hasn't taught us how to do them. I could really use some extra credit in that class. Thanks.
I would suggest that you read ahead in the textbook or the web (eg. http://hyperphysics.phy-astr.gsu.edu/hbase/thermo/phase.html#c1")on specific heat and "heat of fusion" of water first and then try them.

AM
 
Last edited by a moderator:

Thread 'Struggling to understand the concept of this question (ice cube in water optics question)'

TL;DR Summary: I came across this question from a Sri Lankan A-level textbook. Question - An ice cube with a length of 10 cm is immersed in water at 0 °C. An observer observes the ice cube from the water, and it seems to be 7.75 cm long. If the refractive index of water is 4/3, find the height of the ice cube immersed in the water. I could not understand how the apparent height of the ice cube in the water depends on the height of the ice cube immersed in the water. Does anyone have an...
View full post »
Thread 'Variable mass system : water sprayed into a moving container'

Thread 'Variable mass system : water sprayed into a moving container'

Starting with the mass considerations #m(t)# is mass of water #M_{c}# mass of container and #M(t)# mass of total system $$M(t) = M_{C} + m(t)$$ $$\Rightarrow \frac{dM(t)}{dt} = \frac{dm(t)}{dt}$$ $$P_i = Mv + u \, dm$$ $$P_f = (M + dm)(v + dv)$$ $$\Delta P = M \, dv + (v - u) \, dm$$ $$F = \frac{dP}{dt} = M \frac{dv}{dt} + (v - u) \frac{dm}{dt}$$ $$F = u \frac{dm}{dt} = \rho A u^2$$ from conservation of momentum , the cannon recoils with the same force which it applies. $$\quad \frac{dm}{dt}...
View full post »

Similar threads

Relative Humidity and Temperature Changes when adding Heat
Replies
11
Views
2K
Change in temperature of air in a closed system
Replies
16
Views
2K
Find rate of temperature change using heat capacity, density and area
Replies
4
Views
2K
Question about Phase Change & Latent Heat
Replies
13
Views
3K
Confusion about whether to use the specific heat of water or ice
Replies
4
Views
2K
Heat Energy and Power -- Heating ice in a copper pan
Replies
5
Views
2K
Change in Entropy When Mixing Water at Different Temperatures
Replies
5
Views
1K
Energy of a water tank with compressed air
Replies
5
Views
1K
Temperature change of Water after dropping a ball into it
Replies
10
Views
3K
Thermal Energy when Heating and Cooling a Cabaret
Replies
1
Views
1K

Hot Threads

Recent Insights

Back
Top