Answer:
A) F = 1.09 10 5 N, b) Yes
Explanation:
Part A
For this exercise we need the number of free electrons in copper, as the valence of copper +1 there is a free electron for each atom. Let's use the concept of density to find the mass of copper in the sphere
ρ = m / V
.m = ρ V = ρ 4/3 π r³
The radius is half the diameter
r = 1.9 10⁻² / 2 = 0.95 10⁻² m
ρ = 8960 kg / m3
m = 8960 4/3 π (0.95 10⁻²)³
m = 3.2179 10⁻² kg
The molecular weight of copper is 63,546 g / mol which has 6,022 10²³ atoms
With this we can use a rule of proportions to enter the number of atom is this mass
#_atom = 6.022 10²³ 3.2179 10⁻² / 63.546 10⁻³
#_atom = 3,049 10²³
Therefore there is the same number of electrons, as they indicate that the charge of the protone and the electon differs by 1/10⁹ the total charge for each spherical is
q = e / 10⁹ #_atom
q = e / 10⁹ 3,049 1023
q = 3,049 10⁴ (-1.6 10⁻¹⁹)
q = -4,878 10-5 C
Electric force is
F = k q₁q₂ / r²
F = k q² / r²
Let's calculate
F = 8.99 10⁹ (4.878 10⁻⁵)²2 / (1.4 10⁻²)²
F = 1.09 10 5 N
This is a force of repulsion.
Part B
The magnitude of this force is in very easy to detect
it depends upon what state they are in like in motion or res
Explanation:
Assuming the wall is frictionless, there are four forces acting on the ladder.
Weight pulling down at the center of the ladder (mg).
Reaction force pushing to the left at the wall (Rw).
Reaction force pushing up at the foot of the ladder (Rf).
Friction force pushing to the right at the foot of the ladder (Ff).
(a) Calculate the reaction force at the wall.
Take the sum of the moments about the foot of the ladder.
∑τ = Iα
Rw (3.0 sin 60°) − mg (1.5 cos 60°) = 0
Rw (3.0 sin 60°) = mg (1.5 cos 60°)
Rw = mg / (2 tan 60°)
Rw = (10 kg) (9.8 m/s²) / (2√3)
Rw = 28 N
(b) State the friction at the foot of the ladder.
Take the sum of the forces in the x direction.
∑F = ma
Ff − Rw = 0
Ff = Rw
Ff = 28 N
(c) State the reaction at the foot of the ladder.
Take the sum of the forces in the y direction.
∑F = ma
Rf − mg = 0
Rf = mg
Rf = 98 N
The masses amount of a proton and neutron are 1.0087 and 1.0073 amu respectively.
<h3>What is a Proton?</h3>
This is defined as sub atomic particle which is positively charged and is present in the nucleus while the neutron is also a particle present in the nucleus but has a neutral charge.
Electrons on the other hand are found outside the nucleus and are negatively charged. It is the sub atomic particle which is actively involved in a chemical reaction.
The masses of neutron and proton are 1.0087 and 1.0073 amu respectively and was discovered by scientists thereby making it the most appropriate choice.
Read more about Proton and Neutron here brainly.com/question/237857
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