So you know the speed of a wave, and speed is how much the wave moves per second. This wave travels 3x10^8 meters per second. So to find how for you traveled you need to know how many seconds the wave traveled for, 20 minutes is equal to 1200 seconds (times 20 minutes by 60). Then times the seconds by the speed (3x10^8 m/s)x(1200 s) = 3.6x10^11 meters
92882819 I KNOW CAUSE IVE JUST TOOKEN THE TEST
Explanation :
Noble gases are the elements of group 18. This series contains helium, neon, radon krypton and radon.
The noble gases are the least reactive of any elements on the periodic table. This is because they have eight valance electrons in its outermost shell.
Non-metals or poly atomic ions forms acidic compounds with hydrogen. For example : etc forms acidic compounds with hydrogen.
The halogens are the most reactive among all the elements. This is because halogens suddenly combines with most of the metals. They are never seen uncombined in nature.
For example : Chlorine, fluorine and astatine are some halogens.
An isolated system , it does not allow any matter or energy to be exchanged
Answer:
Distance
Explanation:
Work can be defined as the energy transferred to a physical object by exertion of a force on the object to cause a displacement of the object. Thus, work is typically done when a person or simple machine move an object over a distance through the application of a force.
Mathematically, work done is given by the formula;
Where,
W is the work done
F represents the force acting on a body.
d represents the distance covered by the body.
A dependent variable is the event expected to change when an independent variable is manipulated.
Hence, distance is the dependent variable because its value changes with respect to the amount of force exerted on an object.