![shanicar33500](/avatars/43341.jpg)
shanicar33500
06.05.2021 •
Physics
Students need to construct a device that sends a signal using both light and sound. They have a selection of items they can use to build the device. Which two items will be the most useful for making this signaling device?
Solved
Show answers
More tips
- F Family and Home Is it Worth Knowing the Gender of Your Child Before Birth?...
- H Health and Medicine Mercury Thermometer Danger: What to do when a thermometer breaks?...
- F Food and Cooking How to cook crayfish? Everything you need to know...
- G Goods and services LED-подсветка в LCD-телевизорах: 5 причин, почему она лучше других технологий...
- P Photography and Videography Understanding HDR: How It Works and Why You Need It...
- G Goods and services Which TV is better - LCD or Plasma?...
- S Sport How to Learn to Pull Up on Monkey Bars?...
- L Leisure and Entertainment Scrapbooking: What is it and Why is it Becoming More Popular?...
- C Computers and Internet Where did torrents.ru move to?...
Answers on questions: Physics
- P Physics 19. An 8.5-kg box is at rest on a flat, frictionless surface. A 170-N pulling force is briefly applied to the box, after which the box moves at a constant velocity...
- C Chemistry Bone cells are found in what kind of tissue the anwser choices are muscle connective nerve epithelial...
- B Biology Ten square miles of temperate forest has a larger variety of organisms than 10 square miles of taiga. It has . more biodiversity no abiotic factors very little succession...
Ответ:
The specific latent heat of ice is approximately 341 J/g
The correct option is;
b) 341 J/g
Explanation:
The given parameters are;
The mass of ice the pupil adds to the water, m₁ = 37 g
The initial temperature of the ice, T₁ = 0°C
The mass of the water to which the ice is added, m₂ = 100 g
The initial temperature of the water, T₂₁ = 30°C
The final temperature of the water and the melted ice, T₂₂ = 0°C
The specific heat capacity of the water, c₂ = 4.2 J/(g·°C)
By the principle of conservation of energy, we have;
The heat gained by the ice = The heat lost by the water = ΔQ₂
Given that the ice is only melted with no change in temperature, we have;
The heat gained by the ice = The latent heat needed for melting the ice
ΔQ₂ = m₂ × c₂ × (T₂₂ - T₂₁) = 100 × 4.2 × (0 - 30) = -12,600 J
The heat gained by the ice = m₁ ×![L_f](/tpl/images/1010/5223/5547c.png)
Where;
We have;
12,600 = 37 ×![L_f](/tpl/images/1010/5223/5547c.png)
The specific latent heat of fusion of ice =
≈ 341 J/g.