Answer:
20 kg
Explanation:
Kinetic energy=½*Mass * velocity²
4000= ½* m*20²
8000=400m
m=8000/400
m=20 kg
No matter what galaxy you happen to be in all the other galaxies our universe the region around Earth from which light has had time to reach us
example of a great insulator is a thermos. If you put soup in a thermos, you can open it later and enjoy warm soup on a cold winter day. The thermos insulates the soup, trapping the heat inside. Likewise, if you are playing soccer on a hot August afternoon, your thermos full of ice water stays refreshing and cold.
Answer:
The total resistance decreases
Explanation:
The total resistance of a parallel circuit is given by:
where R1, R2, etc. are the individual resistances.
We notice that if we add one more resistor in parallel, we add another positive term 
to the sum, therefore the term 
increases. However, this term is the reciprocal of the total resistance: therefore, this means that the total resistance will decrease.
