a woman run. What main energy conversion occurs?
Thermal energy changes into mechanical energy because heat provides energy for motion.
Chemical energy changes into mechanical energy because energy from digestion of food provides energy for the runner’s motion.
Mechanical energy changes into chemical energy as the kinetic energy from motion creates reactions in the surrounding air.
Mechanical energy changes into thermal energy because the energy from motion creates heat in the air around the runner.
Chemical energy changes into mechanical energy because energy from digestion of food provides energy for the runner's motion.
how?
When the woman runs, her muscles require energy to contract and move her body. This energy comes from the chemical energy stored in the food she has consumed and digested. Through a process called cellular respiration, this chemical energy is converted into a usable form of energy called adenosine triphosphate (ATP). ATP is then used by the muscles to produce mechanical energy, resulting in the motion of the runner. Therefore, the main energy conversion that occurs in this scenario is from chemical energy (from food) to mechanical energy (motion).
The main energy conversion that occurs when a woman runs is chemical energy changing into mechanical energy. This is because the energy from the digestion of food provides the necessary energy for the runner's motion.
The correct answer is:
Chemical energy changes into mechanical energy because energy from digestion of food provides energy for the runner’s motion.
Explanation:
When a woman runs, the main energy conversion that occurs is the transformation of chemical energy into mechanical energy. This means that the chemical energy stored in the food she has eaten is converted into the mechanical energy that allows her muscles to move and propel her forward.
To arrive at this answer, we can analyze the options given:
1. Thermal energy changes into mechanical energy because heat provides energy for motion.
This option is incorrect because heat, or thermal energy, does not play a direct role in providing energy for motion in this case. While there may be some increase in body temperature due to the physical exertion of running, the main source of energy for running is not thermal energy.
2. Chemical energy changes into mechanical energy because energy from digestion of food provides energy for the runner’s motion.
This option is correct. In order to sustain energy for running, our bodies convert the chemical energy stored in the food we consume during digestion into mechanical energy that allows us to move.
3. Mechanical energy changes into chemical energy as the kinetic energy from motion creates reactions in the surrounding air.
This option is not relevant to the energy conversion occurring within the woman's body. While the motion of the runner may cause interactions in the surrounding air, it does not involve a direct conversion of mechanical energy into chemical energy.
4. Mechanical energy changes into thermal energy because the energy from motion creates heat in the air around the runner.
This option is also incorrect. While running does produce heat as a byproduct of muscle activity, the main conversion occurring is not from mechanical energy into thermal energy. Rather, it is from chemical energy into mechanical energy.
Therefore, the correct answer is that chemical energy changes into mechanical energy because energy from digestion of food provides energy for the runner’s motion.