When two surfaces slide against each other, a force called friction makes them stick very slightly together. Smooth surfaces, like ice and glass, are easy to slide over. They create very little friction. Rough surfaces like rock and sand create much more friction, and are easy to grip on to.
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Answer:
The balance will be upset and it will tip to the side of the still pumped ballon.
Explanation:
Given that the balloons are pumped to more than atmospheric pressure it means that the air inside has a higher density than the air outside. If you punture one balloon the air will be released and now you have on both sides the weight of the balloons itselves, but on the side of the still pumped balloon you will have a greater amount of air (is more dense) so more weight. Considering this, the balance will be upset and it will tip to the side of the still pumped ballon.
Answer:
A. They do not require a medium to carry information.
D. They carry information very quickly.
Explanation:
The two characteristics that makes electromagnetic waves effective in communication is that they do not require a medium to carry information and they move information very quickly.
- Electromagnetic waves are produced by the vibration between electrical and magnetic fields.
- These waves are notable for being able to propagate without requiring any medium for their movement.
- They also have very fast speed.
- The speed of all electromagnetic waves is equal to that of light.
Answer:
Refraction are in parts or are reflected brokely, like light against aluminum. While a reflection, is exact. Like a mirror.
The answer is definitely A. A transparent material is a material that allows light to pass through it and can be seen through. A glass jar can be seen through. Some people might say B, which is a mirror, but a mirror cannot be seen through, it only shows reflection. Hope i helped. Have a nice day and Happy New Year.
