1． "Sit on the ground and travel eighty thousand miles in a day, scan the sky and see thousands of rivers in the distance."
"Sitting on the ground" means that it is stationary relative to the ground, while "walking in the day" is moving relative to the axis of the earth.
2． Li Bai's "Looking at Tianmen Mountain" "The green mountains on both sides of the strait stand out from each other, and the solitary sails approach the sun."
"The green mountains come out relative to each other" uses the boat as the reference object, and "the solitary sail comes by the sun" uses the river bank as the reference object.
3. "Sparkling Red Star" "Looking at the mountains is like walking to greet them. If you look carefully at the mountains and the mountains are not moving, it is the boat moving."
"Mountains are coming to greet you" is based on the boat as a reference, while "Mountains are not moving, but boats are moving" is based on the shore.
4. "Last night a strong wind blew the well outside the fence."
The well was blown outside the fence using the fence as a reference.
5. Tang Dynasty poem "Night Mooring on Maple Bridge" "The moon is setting, crows are crying, the sky is full of frost, the rivers, maples and fishing fires are facing melancholy."
The "moonset" in the poem uses the ground as a reference.
1. Su Shi "can draw the eagle bow like the full moon, look northwest, and shoot at the wolf."
The energy conversion involved in the poem is the conversion of elastic potential energy into kinetic energy.
2. Li Bai "Flying down three thousand feet, it is suspected that the Milky Way has fallen from the sky."
The waterfall in the poem involves the energy conversion situation, which is the conversion of gravitational potential energy into kinetic energy.
3. The wildfire never burns out, but spring breeze blows again
Chemical energy is converted into internal energy
Thermal knowledge
1. Lu You's "Village Residence and Mountain Joy" "The scent of flowers strikes people and they know it is suddenly warm, and the sound of magpies piercing the trees welcomes the new clear weather."
The "astonishing flower scent" in the poem is the result of the irregular movement of the aromatic oil molecules secreted by the flowers, and the temperature affects the intensity of the molecular movement.
2． Wang Anshi's "Plum Blossoms" "I know it's not snow from a distance, so why does it smell so faintly?"
Diffusion phenomenon (thermal motion of molecules).
3. Guo Moruo's "Nine Songs of Boating in Wuyi" "The orchids grow in the valleys and the paths are fragrant, and the square bamboos are all over the mountains and green streams."
Diffusion phenomenon (thermal movement of molecules).
4. Zhang Xu's "A Guest in the Mountains" "Even if the sky is bright and there is no rain, the clothes are stained deep in the areola"
The formation of dew (liquefaction).
5. Bai Juyi's "Ode to the Dusk River" "Poor on the third night of September, the dew is like pearls and the moon is like a bow"
The formation of dew (liquefaction).
6. Tang Dynasty poem "Night Mooring on Maple Bridge" "The moon sets and the crows cry, the sky is filled with frost"
The formation of frost (condensation).
The production and spread of sound
1. Tang poem "Night Mooring on Maple Bridge" "Hanshan Temple outside Gusu City, the bells ring at midnight on the passenger ship"
Sound is produced by the vibration of objects; being able to distinguish "bells" and "drums" is based on the timbre. of.
2． Li Daoyuan's "Three Gorges" "There is a sound in the empty valley, and the sorrow lasts for a long time."
Sound will be reflected when it encounters obstacles during propagation. When the reflected sound reaches the human ear 0.1s later than the original sound, the echo can be heard.
3. Li Yi of the Tang Dynasty, "Happy to see my younger brother and say goodbye" "After ten years of separation and chaos, we met again when we were grown up. We were surprised when we first met when we asked each other for our surnames. We recalled our old appearance by calling our names."
Remembered from "Asking for surnames" Seeing the "old appearance" for the first time, it can be seen that there is a feature in the voice that reminds the poet of memories from ten years ago. This feature is the timbre.
4. The big strings are noisy like heavy rain, and the small strings are like whispers
The relationship between sound generation and propagation, pitch and frequency