9. Compounds can form from two nonmetals by sharing their electrons in a
C) covalent
11. An atom that has an excess positive or negative electrical charge caused by the loss or addition of an electron is called a(n) ______.
B) ion
5 is either A or C
Answer:
Because the molecules are not packed together as much than the air, in a fixed volume of helium there are fewer particles than in the same fixed volume of air.
This means that the mass of the fixed volume of helium is smaller than the one of air, and then the density, defined as mass/volume, is also smaller.
This is why the balloon floats, because the air is denser, it tries to go down, pushing the ballon upside.
The case is similar for a piece of metal in water, as the metal is way denser than the water, the metal will sink, but for something not as dense, like a balloon with air, the balloon will remain in the surface of the water.
The correct answer to this Electric current.
The magnitudes of forces at F₁ and F₂ are :
F₁ = 3924 N
F₂ = 4120.2 N
We know that force is the amount of strength required to move a body. The magnitude of force is the sum of all the strengths applied on the body which is exerted by each force together on a particular body.
Given,
Length of plank = 2 m
Force on one end = F₁
Force on the other end = F₂
F₂ is applied to a point which is 0.5 m from the other end
Mass of plank = 20 kg.
Now let us calculate the magnitudes of the forces applied:-
1) Balance of angular momentum around the end where F₁ is applied.
F₂ × 0.5m - F₁ × 0 = mass × g × 1m
⇒ F₂ × 0.5 m= 20 kg × 9.81 m/s² × 1 m = 1,962 N×m
F₂ = 196.2 Nm / 0.5m = 3,924 N
2) Balance of forces
F₁ - F₂ = mg
F₁ = F₂ + mg = 3,924N + 20kg (9.81 m/s²) = 4,120.2 N
Therefore the magnitude of force F₁ is 3924 N and of force F₂ is 4120.2 N.
To know more about force, refer: brainly.com/question/13191643
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Answer:
changing the direction of the electric potential, we can get the particle to be in balance between the electric force, the weight and the thrust.
Explanation:
When the particle is removed from the wire, friction can be electrically charged, either with negative charges (extra electrons) or with positive charge by electron removal, in this case when the particle is between the condenser plates it experiences a force due to the electric field given by
ΔV = E d
Where ΔV is the potential difference, d the distance between the plates and E the electric field.
In these cases we can use Newton's second law, where the acceleration is zero
–W + B = 0
F_{e} = W –B
q E = mg - ρ_air g V
dodne B is the hydrostatic thrust
if we know the density of the particular
ρ_particle = m / V
m = ρ_particle V
We replace
q E = g v (ρ_particle - ρ_air)
Therefore, by changing the direction of the electric potential, we can get the particle to be in balance between the electric force, the weight and the thrust.
