golderhadashaowtatz
29.05.2021 •
Physics
Can someone help me please??
Which is not true about the role of gravity in the formation of planets?
A. Dust and gas particles that were attracted to each other began to rotate into a protoplanetary disk.
B. Gravity between planetesimals caused them to join together into conglomerate clumps.
C. Our solar system is the only place in the universe where gravity played a key part in the formation of planets.
D. Gravity of larger objects in orbit around the sun attracted, and cleared the orbital path of, smaller planetesimals, gas, and dust.
24.
Choose the most accurate description of the dimensions of our solar system:
a. The planets are approximately the same size as each other, and orbit at evenly-spaced distances from the sun.
b. Rocky planets are small, dense, and orbit relatively close to the sun, compared to the Jovian planets, which are large, less dense, and orbiting far from the sun.
c. Rocky planets alternate with gas giants as they orbit at even intervals from the sun
d. Gas planets are small, orbiting relatively close to the sun, while large, dense rocky Giants
orbit the sun at great and varying distances.
25. A new object was discovered in the Kuiper Belt. At 6 billion km from the sun, it could be the newest dwarf planet. How many AU is it from the sun? Use 150,000,000 km as Earth’s orbital distance.
a. 90AU b. 9AU c. 400AU d. 40AU
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Ответ:
1. Our solar system is the only place in the universe where gravity played a key part in the formation of planets.
2. Rocky planets are small, dense, and orbit relatively close to the sun, compared to the Jovian planets, which are large, less dense, and orbiting far from the sun.
3.
Ответ:
Reflection
Explanation:
The wave phenomenon that allows the DVD player to work is REFLECTION.
Reflection is defined as the repropagation of incident light striking a plane surface.
The light ray striking the surface is incident ray while the repropagated light ray is the reflected ray. The DVD was able to play because the laser light that hits the surface of the disk was able to reflect back and returns to the detector. The detector senses the light and cause the DVD to play. If the laser light didn't reflect, assuming it was absorbed by the surface of the disk, the detector wouldn't have detected the light and the DVD wouldn't have played.