An average person is recommended to take in 2000 calories per day (8,400,000J), because they will lose this much energy to heat and work in a typical day. A. If on Saturday you take in 10,000,000J of heat energy through food, lose 5,000,000J to heat and lose 1,450,000J to work, what is your change in energy? B. If on a typical weekday, you actually take in 5,000,000J of heat energy, and lose a total of 12,000,500J (includes both heat and work loss), what is your change in energy? C. From your work in (a) and (b), in which scenario will you store fat for future energy use, and in which scenario will you use fat for energy?
Energy transfer
The flow of energy from one region to another region is referred to as energy transfer. Since energy is quantitative; it must be transferred to a body or a material to work or to heat the system.
Molar Specific Heat
Heat capacity is the amount of heat energy absorbed or released by a chemical substance per the change in temperature of that substance. The change in heat is also called enthalpy. The SI unit of heat capacity is Joules per Kelvin, which is (J K-1)
Thermal Properties of Matter
Thermal energy is described as one of the form of heat energy which flows from one body of higher temperature to the other with the lower temperature when these two bodies are placed in contact to each other. Heat is described as the form of energy which is transferred between the two systems or in between the systems and their surrounding by the virtue of difference in temperature. Calorimetry is that branch of science which helps in measuring the changes which are taking place in the heat energy of a given body.
An average person is recommended to take in 2000 calories per day (8,400,000J), because they will lose this much energy to heat and work in a typical day.
A. If on Saturday you take in 10,000,000J of heat energy through food, lose 5,000,000J to heat and lose 1,450,000J to work, what is your change in energy?
B. If on a typical weekday, you actually take in 5,000,000J of heat energy, and lose a total of 12,000,500J (includes both heat and work loss), what is your change in energy?
C. From your work in (a) and (b), in which scenario will you store fat for future energy use, and in which scenario will you use fat for energy?
An average person needs 8,400,000 J of energy.
On a Saturday, a person takes 10,000,000 J of energy through food out of which 5,000,000 J is lost to heat and 1,450,000 J is lost to work.
On a typical weekday, a person takes 5,000,000 J of energy through food and lose 12,000,500 J of energy in heat and work.
So, for Saturday, the change in energy will be the difference in energy consumed and energy used.
Thus, the remaining energy on that Saturday is 3,550,000 J
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