Answer:
The presence of dwarf galaxies around the Milky Way supports what picture that our galaxy was formed by a coming together or combination of smaller systems
Hello. This question is incomplete. The full question is:
Two blocks are stacked on top of each other on the floor of an elevator. For each of the following situations, select the correct relationship between the magnitudes of the two forces given.
The elevator is moving downward at a constant speed.
The magnitude of the force of the bottom block on the top block is _____ the magnitude of the force of the earth on the top block.
Answer:
The magnitude of the force of the bottom block on top block is equal to the magnitude of the force of the top block on bottom block.
Explanation:
As the elevator is descending, there is only a normal force being applied to the lower surface of the block. This force has a magnitude equal to the force of the upper block, because the only acceleration that is acting in this case is the force of gravity. From that force, the resulting force is zero.
Answer:

Explanation:
Let the total force be F
The force that produces motion in the x direction is given as, 
Let the frictional force be given as:

Thus, the net force is given as:

Answer:
Velocity= Distance divided by time divided by degree or direction.
Explanation:
Speed=DIstance divided by time
O3 has molar mass of 48 g/mol
Therfore I mole weighs 48 grams
9.11 moles of ozone has a mass of 9.11 x 48grams = 437grams = 0.437kg