Answer:
1. C. The change is easily reversible
2. A. a physical change
Explanation:
Happy Holidays
Answer:
<h3>Hydrogen gas is responsible for polarizination defect.</h3>
We would have to search at least 5,000,000,000 (5 billion) stars before we would expect to hear a signal.
To find out the number of stars that we will need to search to find a signal, we need to use the following formula:
- total of stars/civilizations
- 500,000,000,000 (500 billion) stars / 100 civilization = 5,000,000,000 (5 billion)
This shows it is expected to find a civilization every 5 billion stars, and therefore it is necessary to search at least 5 billion stars before hearing a signal from any civilization.
Note: This question is incomplete; here is the complete question.
On average, how many stars would we have to search before we would expect to hear a signal? Assume there are 500 billion stars in the galaxy.
Assuming 100 civilizations existed.
Learn more about stars in: brainly.com/question/2166533
Answer:Gibb's free energy
Explanation:
The Free energy change describes the amount of energy that is available in any system to do work. It is often designated with the symbol G
answer
v = 4.2
set up an equation
we can use the formula for kinetic energy since we know mass and kinetic energy
K = 
v = 
values
K = 0.013 J
m = 1.5g = 0.0015 kg
plug in values
v = 
v = 4.2
