Friction occurs when the surfaces and heat of two surfaces grind against each other.
I think these are the answers
Answer:Force is to the right
Explanation: because the right side has 75N compared to the 25N on the left.
Answer: wavelength is 
The frequency of the microwave is, f = 2.30 GHz.
To Find frequency use the formula:
λ
Where, c is the speed of electromagnetic wave or light. f is the frequency, and λ is the wavelength of light.
Rearranging,
Plug in the values,

Answer:
v = 6.95 m/s
Explanation:
Given that,
A diver is on a board 1.80 m above the water, s = 1.8 m
The initial speed of the diver, u = 3.62 m/s
Let v is the speed with which she hit the water. It will move under the action of gravity. Using the equation of motion as follows :

So, she will hit the water with a speed of 6.95 m/s.
Answer:
not 100% sure what you were asking.
Explanation:
A reaction where the consequences of a reaction cause a succeeding like reaction is called a <u>chain reaction</u>.