What main energy conversion occurs?
(1 point)
• Chemical energy changes into mechanical energy because energy from digestion of food provides energy for the runner's motion.
Mechanical energy changes into thermal energy because the energy
from motion creates heat in the air around the runner.
Thermal energy changes into mechanical energy because heat provides energy for motion.
• Mechanical energy changes into chemical energy as the kinetic energy from motion creates reactions in the surrounding air.
9 answers
The correct option is:
• Chemical energy changes into mechanical energy because energy from digestion of food provides energy for the runner's motion.
This accurately describes how the energy from the nutrients in the food that the woman has digested is converted into mechanical energy, allowing her to move while running.
The correct option is:
• Heated gases will increase in kinetic energy and decrease in density. (A)
When gases are heated, their kinetic energy increases, causing the gas molecules to move faster and spread apart. This results in a decrease in density, allowing the heated gases to rise above cooler, denser gases.
The correct option is:
Heat is transferred from the air and metal to the ice cube, and the ice (B)
This statement accurately describes what happens: heat flows from the warmer metal block (and the surrounding air) to the colder ice cube, causing the ice to absorb heat and melt.
The correct option is:
Heat was transferred through conduction to the cup and spoon when (C) heat was transferred through conduction to the cup and spoon when the hot water molecules collided frequently with the cooler molecules in the cup and spoon and transferred heat.
This is the appropriate explanation because conduction involves the transfer of heat through direct contact between molecules, which occurs when the hot water molecules come into contact with the cup and spoon.
The correct answer is:
Radiation
Radiation is the type of energy transfer that can occur without the presence of matter. It occurs through electromagnetic waves, such as infrared radiation from the sun, which can travel through the vacuum of space. In contrast, convection and conduction require matter to transfer heat.
