Why is the sky blue?
Why does the moon appear in the daytime?
How much does the sky weigh?
How much does the Earth weigh?
How do airplanes stay in the air?
Why is water wet?
What makes a rainbow?
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Answers
Answer:
1- The sky is blue because the air scatters blue light from the Sun across the sky and down to our eyes.
2- When the moon is full or close to full, it's only out at night: it rises around sunset and sets around sunrise. The rest of the month, the moon is not in the sky all night. That's because the moonrise and moonset times change throughout the month. This is why you can see the moon in the morning sometimes.
3- Sky weighs one millionth of the mass of the Earth.
4- 13,170,000,000,000,000,000,000,000 pounds or (or 5,974,000,000,000,000,000,000,000 kilograms).
5-The theory states that a wing keeps an airplane up by pushing the air down. Air has mass, and from Newton's third law it follows that the wing's downward push results in an equal and opposite push back upward, which is lift.
6- Water is wet because its viscosity is low, which is because its molecules are rather loosely joined together.
7- Rainbows are formed when light from the sun is scattered by water droplets (e.g. raindrops or fog) through a process called refraction.
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Answer:
1.As white light passes through our atmosphere, tiny air molecules cause it to 'scatter'. The scattering caused by these tiny air molecules (known as Rayleigh scattering) increases as the wavelength of light decreases. ... Therefore, blue light is scattered more than red light and the sky appears blue during the day.
2.We can see the moon during the day for the same reason we see the moon at night. The surface of the moon is reflecting the sun's light into our eyes. ... "When we see the moon during the day it's because the moon is in the right spot in the sky and it's reflecting enough light to be as bright, or brighter, than the sky."
3.At eight pounds per gallon, that's another 38,593,169,564 pounds of water in the air. Add it all up, and the total weight of our sky is 12,107,415,382,493,169,564 pounds, more than 12 quintillion pounds!
4.Earth weighs about 13,170,000,000,000,000,000,000,000 pounds (or 5,974,000,000,000,000,000,000,000 kilograms). Since Earth is too big to be placed on a scale, scientists use mathematics and the laws of gravity to figure out Earth's weight.
5.Four forces keep an airplane in the sky. They are lift, weight, thrust and drag. Lift pushes the airplane up. The way air moves around the wings gives the airplane lift.
6.Water weight gain occurs when extra water is stored in the tissue or between blood vessels. There are a number of factors that can cause water retention including consuming high amounts of sodium or carbohydrates, dehydration, lifestyle, hormones, medication, or even the weather.
7.When sunlight hits a rain droplet, some of the light is reflected. The electromagnetic spectrum is made of light with many different wavelengths, and each is reflected at a different angle. Thus, spectrum is separated, producing a rainbow.