<em>The correct answer to this question is actually letter B.</em> To expound on this, let's discuss each choice.
A. The particles inside the nucleus, protons and nucleus, don't actually dictate the properties of substances because the nucleus constitutes very little space compared to the rest of the atoms.
B. It is the electrons, especially the valence electrons, that dictate the property because these are the electrons that take part in chemical reactions.
C. The atomic number is the number of protons. It has nothing to do with the neutrons.
D. The atomic mass only tells the weight of each atom. The weight does not dictate the chemical properties of a substance.
Answer:it will take 10 hours
Explanation: The way we get this answer is if the boat travels 200 miles at 20 mph that means that every 20 miles the boat traveled an hour would pass. Using this we can see that 20 fits into 200, 10 times, meaning that the time it would take to travel would be 10 hours.
I really don't understand what's behind this question at all,
but I can sure do the math:
Speed = (distance covered) / (time to cover the distance) .
= ( 36 meters) / (13 seconds)
= (36/13) (meters/second)
= 2.7692... meters per second (rounded)
(about 6.2 miles per hour) .
Surface mining is the method of removing the overburden parts of the earth which are the earth and rocks. It also involves removal and loading out of the coal, and then placing back the collected earth back into a surface once again. It's also a method that uses equipment or explosives.
Answer:
Weight needed to balance the bar is 
Explanation:
Given the weight of the bar is 
The length of the bar is 
The weight of the bar will be uniformly distributed over the entire span. We will consider this as a point load acting in the middle of span length, which is at a distance of 
from both ends.
Now applying momentum equation about balanced load we get, (see attachment)
