Question

1. what is kinetic energy?
2. what happens to the kinetic energy of the particles of a substance when heat is added?
3. the picture above shows cooler air flowing towards land during the day because the air above the water is cooler, and the air above the land is warmer. which type of heat transfer does this demonstrate?

a) convection
b) conduction
c) radiation

1. if you burned your hand when touching a hot stove, this would be an example of which type of heat transfer?

a) convection
b) conduction
c) radiation

1. which of the following have the most kinetic energy?

a) solids
b) liquids
c) gases

1. what type of electromagnetic wave causes sunburns, and can be used to sanitize surfaces?

a) infrared waves
b) gamma rays
c) radio waves
d) ultraviolet waves

Explanation:

1. Kinetic energy is the energy of motion. An object in motion has kinetic energy, calculated by the formula $KE=\frac{1}{2}mv^{2}$, where $m$ is mass and $v$ is velocity.
2. When heat is added to a substance, the kinetic energy of its particles increases. This causes the particles to move faster.
3. The movement of cooler air towards land when air above water is cooler and above land is warmer is convection. Convection is the transfer of heat by the movement of a fluid (in this case, air).
4. Burning your hand when touching a hot - stove is conduction. Conduction is the transfer of heat through direct contact between substances.
5. Gases have the most kinetic energy among solids, liquids, and gases. Gas particles move freely and at high speeds compared to particles in solids and liquids.
6. Ultraviolet waves cause sunburns and can be used to sanitize surfaces. UV radiation has enough energy to damage skin cells and kill microorganisms.

Answer:

1. The energy of motion.
2. The kinetic energy of the particles increases.
3. A. Convection
4. B. Conduction
5. C. Gases
6. D. Ultraviolet waves