Answer:
Microwaves are a type of wave that are sandwiched between radio waves and infrared radiation on the electromagnetic spectrum. In the case of microwave ovens, the commonly used wave frequency is roughly 2,450 megahertz.
Answer:
B. 24.2 m/s
Explanation:
Given;
mass of the roller coaster, m = 450 kg
height of the roller coaster, h = 30 m
The maximum potential energy of the roller coaster due to its height is given by;
![P.E_{max} = mgh\\\\PE_{max} = 450 *9.8*30\\\\PE_{max} = 132,300 \ J](https://tex.z-dn.net/?f=P.E_%7Bmax%7D%20%3D%20mgh%5C%5C%5C%5CPE_%7Bmax%7D%20%3D%20450%20%2A9.8%2A30%5C%5C%5C%5CPE_%7Bmax%7D%20%3D%20132%2C300%20%5C%20J)
![P.E_{max} = K.E_{max} \ (law \ of \ conservation\ of \ energy)](https://tex.z-dn.net/?f=P.E_%7Bmax%7D%20%3D%20K.E_%7Bmax%7D%20%5C%20%28law%20%5C%20of%20%5C%20conservation%5C%20of%20%5C%20energy%29)
![K.E_{max} = \frac{1}{2}mv_{max}^2\\\\ v_{max}^2 = \frac{2K.E_{max}}{m}\\\\ v_{max}^2 = \frac{2*132300}{450}\\\\ v_{max}^2 =588\\\\v_{max} = \sqrt{588}\\\\ v_{max} = 24.2 \ m/s](https://tex.z-dn.net/?f=K.E_%7Bmax%7D%20%3D%20%5Cfrac%7B1%7D%7B2%7Dmv_%7Bmax%7D%5E2%5C%5C%5C%5C%20v_%7Bmax%7D%5E2%20%3D%20%5Cfrac%7B2K.E_%7Bmax%7D%7D%7Bm%7D%5C%5C%5C%5C%20v_%7Bmax%7D%5E2%20%3D%20%5Cfrac%7B2%2A132300%7D%7B450%7D%5C%5C%5C%5C%20v_%7Bmax%7D%5E2%20%3D588%5C%5C%5C%5Cv_%7Bmax%7D%20%3D%20%5Csqrt%7B588%7D%5C%5C%5C%5C%20%20v_%7Bmax%7D%20%3D%2024.2%20%5C%20m%2Fs)
Therefore, the maximum speed of the roller coaster is 24.2 m/s.
Answer:
This could represent something like sliding a small rock across an icy lake.
Explanation:
A 20N force of gravity (weight), and 20N normal force exerted back onto the object imply it is on the ground and has no vertical motion. There is a net force of 0N
An 80N force to the left and a 5N force to the right create a net force of 75N to the left. This means that there is a force acting on the object that makes it accelerate to the left. 80N represents a push or pull force and 5N represents a relatively small frictional force due to the object being slid on a surface such as steel or in this case ice.
Answer:
Unknown
Explanation:
Because we cannot observe space beyond the edge of the observable universe, it is unknown whether the size of the Universe in its totality is finite or infinite.
Answer:
osmosis
Explanation:
another kind of diffusion. - diffusion of water through a differentially permeable membrane from a region of high concentration to a region where the concentration is lower. osmotic pressure. of a solution is a measure of its tendency to draw water molecules into it by osmosis.