Answer:
Each type of electromagnetic radiation have been matched to their descriptions as follows:
Ultraviolet light A) Given off by very hot objects, such as the sun
Gamma rays B) Given off by radioactive substances
Microwaves C) Used in radar and to heat food
X‒rays D) Used in the medical field to see bone structure
Explanation:
PLS GIVE BRAINLEST
The charge of the copper nucleus is 29 times the charge of one proton:

the charge of the electron is

and their separation is

The magnitude of the electrostatic force between them is given by:

where

is the Coulomb's constant. If we substitute the numbers, we find (we can ignore the negative sign of the electron charge, since we are interested only in the magnitude of the force)
Answer:
When air resistance equals the weight of an object, the object has reached free fall.
Explanation:
- When an object has only force acting on it as gravity then, it experiences free fall.
- During free fall all the forces except gravity is balanced by one another.
- In the question, object's weight is balanced by air resistance so it is in the state of free fall.
- At the null point of free fall, object experiences weightlessness i.e. it feels like object is not attracted by any force.
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