Answer:
A. independent variable.
Explanation:
In this experiment, the types of box materials are a(n) independent variable, which is when you purposely change things or control them, hoping for a specific outcome.
Answer:
The wavelength of the radio wave will be 3.271 m
Explanation:
We have given frequency of the radio signal 
Speed of the light 
We have to find the wavelength of the radio signal
We know that wavelength is given by 
So the wavelength of the radio wave will be 3.271 m
Answer:
x = 3.5 cm
Explanation:
When spring is used as a lift tool
so the mass suspended on it will have spring force on it
So as per the force equation of mass we can say

now net force on the mass is


here we have

now we have



The answer is c 1386j
This calculator is very helpful I use it on my homework
https://www.omnicalculator.com/physics/specific-heat
Atoms<span> are </span>neutral<span>; they contain the same number of protons as electrons. By definition, an ion is an electrically charged particle produced by either removing electrons from a </span>neutral atom<span> to give a positive ion or adding electrons to a </span>neutral atom<span> to give a negative ion.</span>