When you have a pot of water on the stove, heat is transferred to the water. Describe the behavior of the water molecules and ho
2 answers:
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a)
b)
Explanation:
a)
Since there are no external torques acting on the system, the total angular momentum must remain constant.
At the beginning, the merry-go-round and the girl are at rest, so the initial angular momentum is zero:
Later, after the girl throws the rock, the angular momentum will be:
where:
is the moment of inertia of the merry-go-round
is the moment of inertia of the girl, where
M is the mass of the girl
R is the distance of the girl from the axis of rotation
is the angular speed of the merry-go-round and the girl
is the angular momentum of the rock, where
m is the mass of the rock
v is its velocity
Since the total angular momentum is conserved,
So we find:
And the negative sign indicates that the disk rotates in the direction opposite to the motion of the rock.
b)
The linear speed of a body in rotational motion is given by
where
is the angular speed
r is the distance of the body from the axis of rotation
In this problem, for the girl, we have:
is the angular speed
is the distance of the girl from the axis of rotation
Therefore, her linear speed is:
The scientist that described an atom made a solid positively charged substance with electrons dispersed throughout it was: Ernest Rutherford
In 1911 Ernest Rutherford proposed his atomic model in which he considered the atom as a positively, densely charged center called a nucleus in which the electrons circulate around the core with a negative charge.
<h3>What is an atom?</h3>The atom is the smallest part of the composition of matter, it is indivisible and is composed of a nucleus that has protons and neutrons, and around the nucleus there are the electrons.
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0.04m²
Explanation:
Given parameters:
Pressure = 250000Pa
Weight = 40000N
Unknown:
Area of each foot = ?
Solution:
Pressure is the force exerted per unit area of a body
Pressure =
To find the area;
Area =
Area = = 0.16m²
The force exerted by all the four feet is 0.16m²
the area of each feet = = 0.04m²
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