Responder:
12374550,527 N / m²
Explicación:
Dado que:
Número de tacos = 10
Área de cada montante = 0.01 in²
Peso total de la persona = 180 libras
Usando la relación:
Presión = Fuerza / Área
La fuerza ejercida es el producto de la masa y la aceleración debido a la gravedad.
Masa = 180 libras = 81,47 kg
Aceleración por gravedad = 9,8 m / s²
Área total = (número de montantes * Área por montante) = (10 * 0.01) = 0.1 pulg²
Conversión a m²:
0,1 pulg² = 6,452 * 10 ^ -5 m²
Por lo tanto,
Presión = (81,47 * 9,8) / (6,452 * 10 ^ -5)
Presión = 798.406 / 0.00006452
Presión = 12374550.527 N / m²
Answer:
she will eventually slow down and come to a stop
F=M×A
F=3 ×15
F=45N
so the force is 45 N
<h2>Answer: polar covalent bonding</h2>
In polar covalent bonding, electrons are shared <u>unequally </u>between atoms, due to the unequal distribution of electrons between atoms of different elements, slightly positive and slightly negative charges appear in different parts of the molecule.
In this context, water molecule is an exellent example of this type of bonding:
Water (
) can stick to itself through hydrogen bonds, because a water molecule consists of 2 hydrogen atoms attached to 1 oxygen atom.
The oxygen atom tends to monopolize more electrons and keeps them away from hydrogen. Then, it can be said that a water molecule will have a negative side (oxygen) and a positive side (hydrogen).
Thanks to this polarity, water molecules can stick together with the formation of hydrogen bonds to attract a partial positive charge of hydrogen and a more electronegative atom, such as oxygen.
having to push a rough and heavy box across the floor to move it
Explanation:
Friction is not a useful force because we have to exert even more force to push a body that is rough and heavy across the floor to move it.
- Frictional force is a force that opposes the motion of a body.
- It costs more and uses more energy to push a rough and heavy box on surface because of friction.
- This wastes energy in systems that deals with pushing.
Friction is useful in that:
- the heat energy produced when two surfaces rub together is very useful.
- the friction between your feet and the floor keeping you from slipping and makes walking possible.
- the tread on tires helping the moving vehicle slow down and stop when necessary.
learn more:
Friction brainly.com/question/7174363
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