# Physics Website: Find Answers to Questions

• joejo
In summary, when 1 kg of water at 1000C is mixed with 10 kg of water at 00C, the equilibrium temperature will be 0 degrees Celsius.
joejo
Hi guys...

My teacher for my online course gave me an assignment. But never gave us notes/lessons on the questions asked. I will list a few below and I was wondering if someone could please give me some links where I can find some information that will help me understand how to answer these questions.

Amy pours 1 kg of water at 7.0 ° C into a bowl. Calculate the amount of heat energy needed to bring this water to a boil. The specific heat for water is 4186 J/kg. ° C.

A block made of an unknown substance has a mass of 1.5 kg and a temperature of 15.0 ° C. When 2.6 x 104 J of heat is added to the block, its temperature rises to 90 ° C. Calculate the specific heat capacity to the unknown substance

When 1 kg of water at 1000C is mixed with 10 kg of water at 00C, the equilibrium temperature will be

Calculate the amount of heat energy required to boil 1.0 kg of water at 100 ° C into steam at 100 ° C. The latent heat of vaporization for water is 2.26 x 106 J/kg

An elevator motor lifts the elevator full of passengers to a height of 12 m in 30 s. If the mass of the elevator and passengers is 1000 kg, what is the power developed by the motor
The efficiency of an incandescent light bulb is only 4.0%. Calculate the amount of electric energy that must be input to the bulb in order to get 100 J of light energy from the bulb

Amy pours 1 kg of water at 7.0 ° C into a bowl. Calculate the amount of heat energy needed to bring this water to a boil. The specific heat for water is 4186 J/kg. ° C.
Look at the units. "specific heat" is $$\frac{Joules}{Kilograms*degrees C}$$. the problem ask for energy (which is in "Joules"). In order to "cancel" the kg and degrees C in the denominator, you need to multiply that "fraction" by some number of kilograms and some number of degrees. You are given "1 kg of water" and you must raise it from 7 degrees to 100 degrees (in other words raise its temperature by 93 degrees) to bring it to a boil. What do YOU think you should do?

A block made of an unknown substance has a mass of 1.5 kg and a temperature of 15.0 ° C. When 2.6 x 104 J of heat is added to the block, its temperature rises to 90 ° C. Calculate the specific heat capacity to the unknown substance

As before: specific heat is [tex]\frac{Joules}{kg*degrees C}. You are given Joules, kg and a rise in temperature from 15 degrees to 90 degrees, an increase of 75 degrees. What do you think you need to do to calculate the specific heat?

When 1 kg of water at 1000C is mixed with 10 kg of water at 00C, the equilibrium temperature will be?
I think you MEANT 100 degrees C and 0 degrees C. At 1000C, it wouldn't be water! Since these are both water, you don't need to worry about different "heat capacities". This is really just a "weighted average" problem.

Calculate the amount of heat energy required to boil 1.0 kg of water at 100 ° C into steam at 100 ° C. The latent heat of vaporization for water is 2.26 x 106 J/kg
Once again, look at the units: "latent heat of vaporization" is [tex]\frac{Joules}{kilogram}. To "cancel" the kg and get only Joules (heat energy), you will need to multiply by some number of kilograms. How many kilograms are involved here?

An elevator motor lifts the elevator full of passengers to a height of 12 m in 30 s. If the mass of the elevator and passengers is 1000 kg, what is the power developed by the motor
"Power" is energy divided by time (work per unit time). If you raise 1000 kg 12 meters, what is the work done? If that is done in 30 s, how much work is done per second?

The efficiency of an incandescent light bulb is only 4.0%. Calculate the amount of electric energy that must be input to the bulb in order to get 100 J of light energy from the bulb
If the efficiency is 4.0%, then the amount of light put out is only 4% of then energy input: 0.04*energy input= 100J. Solve for the energy input.

thanks for your help guys...this is grade 11 physics...its not in our outline...but i don't know why were doing it...

but is there a site...there will help me understand it more...listing all the formulas

## 1. What is the purpose of the "Physics Website: Find Answers to Questions"?

The purpose of the "Physics Website: Find Answers to Questions" is to provide a platform for individuals to ask and find answers to their questions related to physics. It is a reliable source of information for those seeking to understand various concepts and principles in the field of physics.

## 2. Can anyone ask and answer questions on the "Physics Website: Find Answers to Questions"?

Yes, anyone can ask and answer questions on the "Physics Website: Find Answers to Questions". However, it is recommended that the answers provided are backed by reliable sources and are accurate to ensure the quality of information available on the website.

## 3. How are the questions and answers on the "Physics Website: Find Answers to Questions" organized?

The questions and answers on the "Physics Website: Find Answers to Questions" are organized by topics and categories. This makes it easier for users to find relevant information and also helps in maintaining a structured and organized database of questions and answers.

## 4. Are there any experts or professionals moderating the questions and answers on the "Physics Website: Find Answers to Questions"?

Yes, there are experts and professionals who moderate the questions and answers on the "Physics Website: Find Answers to Questions". They ensure that the information provided is accurate and reliable, and also help in resolving any disputes or conflicts that may arise.

## 5. Is the information on the "Physics Website: Find Answers to Questions" peer-reviewed?

No, the information on the "Physics Website: Find Answers to Questions" is not peer-reviewed. However, the website strives to provide accurate and reliable information by verifying the sources of the answers and ensuring that the experts and professionals moderating the content are knowledgeable in their respective fields of physics.

• Introductory Physics Homework Help
Replies
3
Views
1K
• Introductory Physics Homework Help
Replies
12
Views
1K
• Introductory Physics Homework Help
Replies
10
Views
2K
• Introductory Physics Homework Help
Replies
9
Views
971
• Introductory Physics Homework Help
Replies
3
Views
2K
• Introductory Physics Homework Help
Replies
13
Views
2K
• Introductory Physics Homework Help
Replies
3
Views
1K
• Introductory Physics Homework Help
Replies
1
Views
2K
• Introductory Physics Homework Help
Replies
1
Views
2K
• Introductory Physics Homework Help
Replies
2
Views
4K