Answer: through digested food
Explanation: cells get their sugar molecules from the food that is taken in by an organism. The food taken in is digested by the stomach into base materials like sugar, fatty acids and amino acids. These base materials are circulated through the blood till they get to the cells where they are needed.
Answer:
2513.6 W
Explanation:
Acoustic power = sound intensity × area of hemisphere
Sound intensity = 1 W/m^2
Area of hemisphere = 2πr^2 = 2×3.142×20^2 = 2513.6 m^2
Acoustic power = 1 W/m^2 × 2513.6 m^2 = 2513.6 W
A. Air, desk, water. sound travels the slowest through air and the fastest through liquids. solids are somewhere in the middle.
Answer:
Assuming the emissivity is 1.0, the temperature of the wood stove will be about 417 C
Explanation:
You can use the Stefan-Boltzmann formula tying energy with temperature of a blackbody:
P - rate of radiation
is the blackbody's emissivity
is the Stefan-Boltzmann constant
A - area
T - temperature
So,
![P=\epsilon \sigma AT^4\implies T = \sqrt[4]{\frac{P}{\epsilon \sigma A}}\\T = \sqrt[4]{\frac{18000W}{1.0\cdot 5.67\cdot 10^{-8} \frac{W}{m^2\cdot K^4}\cdot 1.4 m^2}}\approx 690K \approx 417^\circ C](https://tex.z-dn.net/?f=P%3D%5Cepsilon%20%5Csigma%20AT%5E4%5Cimplies%20T%20%3D%20%5Csqrt%5B4%5D%7B%5Cfrac%7BP%7D%7B%5Cepsilon%20%5Csigma%20A%7D%7D%5C%5CT%20%3D%20%5Csqrt%5B4%5D%7B%5Cfrac%7B18000W%7D%7B1.0%5Ccdot%205.67%5Ccdot%2010%5E%7B-8%7D%20%5Cfrac%7BW%7D%7Bm%5E2%5Ccdot%20K%5E4%7D%5Ccdot%201.4%20m%5E2%7D%7D%5Capprox%20690K%20%5Capprox%20417%5E%5Ccirc%20C)
Assuming the emissivity ( a number between 0 and 1) is 1.0, the temperature of the wood stove will be about 417 C. The emissivity number was not given in your question. If you determine what it is, you can divide this result by the fourth power of that value to get an updated result.