Which of the following lists the Earth’s layers in order from hottest to coldest in temperature?A.outer core, mantle, inner core, crust
B.crust, mantle, outer core, inner core
C.inner core, outer core, mantle, crust
D.mantle, crust, inner core, outer core
Answers
Logically, the deeper we go, the hotter it will get.
It turns out that the innermost part of the lithosphere is the hottest, while the outermost part of the lithosphere is the hottest (suprise!).
Option C is correct.
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It has no fixed volume or shape.
B.
It has a fixed volume and varied shape.
C.
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D.
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Answers
Rutherford's experiment conclude that: atoms are not solid, atoms are hollow and most of the space is vacuum and the positive charge in an atom is not spread evenly .
What is conclusion of Rutherford's experiment?
Rutherford's observations lead him to draw the following conclusions:
- Most of the space in an atom is unoccupied since a significant portion of the -particles bombarded towards the gold sheet went through the sheet without any deflection.
- Because some of the -particles were somewhat deflected by the gold sheet, the positive charge in an atom is not spread evenly. An atom's positive charge is confined to a very small volume.
- Only a few of the -particles had deflection angles that were nearly 180 degrees, meaning that very few of the -particles were deflected back. As a result, in relation to the total volume of an atom, the positively charged particles' volume is extremely small.
Learn more about Rutherford's experiment here:
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Rutherford's model of the atom (ESAAQ) Rutherford carried out some experiments which led to a change in ideas around the atom. His new model described the atom as a tiny, dense, positively charged core called a nucleus surrounded by lighter, negatively charged electrons.
despite experiencing a 60N drag. Neglect any friction
impeding her motion.
How many forces are acting on the bicyclist?
What is the magnitude of the net force on the bicyclist?
How much force is the bicyclist generating through her
pedaling?
Answers
a) 4 forces
b) 186 N
c) 246 N
Explanation:
a)
Let's count the forces acting on the bicylist:
1) Weight (): this is the gravitational force exerted on the bicyclist by the Earth, which pulls the bicyclist towards the Earth's centre; so, this force acts downward (m = mass of the bicyclist, g = acceleration due to gravity)
2) Normal reaction (N): this is the reaction force exerted by the road on the bicyclist. This force acts vertically upward, and it balances the weight, so its magnitude is equal to the weight of the bicyclist, and its direction is opposite
3) Applied force (): this is the force exerted by the bicylicist to push the bike forward. Its direction is forward
4) Air drag (): this is the force exerted by the air on the bicyclist and resisting the motion of the bike; its direction is opposite to the motion of the bike, so it is in the backward direction
So, we have 4 forces in total.
b)
Here we can find the net force on the bicyclist by using Newton's second law of motion, which states that the net force acting on a body is equal to the product between the mass of the body and its acceleration:
where
is the net force
m is the mass of the body
a is its acceleration
In this problem we have:
m = 60 kg is the mass of the bicyclist
is its acceleration
Substituting, we find the net force on the bicyclist:
c)
We can write the net force acting on the bicyclist in the horizontal direction as the resultant of the two forces acting along this direction, so:
where:
is the net force
is the applied force (forward)
is the air drag (backward)
In this problem we have:
is the net force (found in part b)
is the magnitude of the air drag
Solving for , we find the force produced by the bicyclist while pedaling:
Answers
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Explanation: iron is a negitive n a postive
Answer: k12 unit test
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true or false?
Answers
Answer:false
Explanation:
Atoms don’t always fission the same way. You saw three different possible fission reactions for U-235
Answer: F
Explanation: