1) Forces acting on your body: force of gravity and normal reaction
2) Due to Newton's second law, N = mg
Explanation:
1)
When you sit on the computer, there are only two forces acting on you:
- The force of gravity, acting downward, of magnitude , where m is your mass and is the acceleration due to gravity, downward
- The normal reaction exerted by the chair on you, , acting upward
Your body is in equilibrium (it doesn't move), this means that the two forces balance each other, therefore:
2)
We can now apply Newton's second law of motion to this situation; this law states that the net force acting on a body is equal to the product between its mass and its acceleration. Mathematically,
where
is the net force
m is the mass
a is the acceleration
In this situation, the net force is
So the equation becomes
However, we observe that your body is at rest; therefore, the acceleration is zero:
a = 0
And therefore,
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Answer:
E = 5.03 10⁻³ N / C
Explanation:
For this exercise we can use Gauss's law
Ф = E. dA = /ε₀
Where as a Gaussian surface we select a cylinder
Ф= E A = q_{int} /ε₀
Let's use the concept of surface charge density
σ = q / A
q = σ A
E A = σ A /ε₀
E = sig /ε₀
Since the plate is non-conductive, the fux does not flow through the plate
With this equation the electric field does not depend on the distance, so the field at 1 cm
E = 45 10³ N/C
σ = E ε₀
σ = 45 10³ 8.85 10⁻¹²
σ = 3.98 10⁻¹⁰ C / m²
As the point where the field is requested is very far from the plate we can not ignore the finite size of it
At r = 15 m the plate has a very small size, so let's calculate the field as created by a point load at this distance
E = k q / r²
The plate area is
A = L L
A = 0.75²
A = 0.5625 m²
q = σ A
q = 3.98 10⁻¹⁰ 0.5625
q = 1.26 10⁻¹⁰ C
Let's calculate
E = 8.99 10⁹ 1.26 10⁻¹⁰ / 15²
E = 5.03 10⁻³ N / C
To solve this problem, it is necessary to apply the concepts related to the change of entropy in function of the Volume in two states due to the number of moles and the ideal gas constant, this can be expressed as
Where,
R = Gas constant
V = Volume (at each state)
At the same time the number of moles of gas would be determined by the ideal gas equation, that is,
Where,
P = Pressure
V = Volume
R = Gas Constant
T = Temperature
Using the value of moles to replace it in the first equation we have
Therefore the correct option is A.
Answer:
Attractive Property – Magnet
Explanation:
attracts ferromagnetic materials like iron, cobalt, and nickel. Repulsive Properties – Like magnetic poles repel each other and unlike magnetic poles attract each other. Directive Property – A freely suspended magnet always points in a north-south direction.