Sign of the charge???A glass marble is rubbed against a piece of silk. As a result the piece of fabric acquires extra electrons. What happens to the glass marble? (a)The marble has lost the same number of electrons acquired by the piece of silk. (b)The marble has acquired the same number of electrons acquired by the piece of silk. (c)The marble acquires a positive charge and repels the piece of silk. (d)The marble acquires a positive charge and attracts the piece of silk. (e)The marble acquires a negative charge and attracts the piece of silk. (f)The marble acquires a negative charge and repels the piece of silk. There may be more than one answer.

An alpha particle is identical to a(n) helium nucleus. An alpha particle is identical to a helium nucleus because both have two protons and two neutrons. Essentially, a helium atom stripped of its electrons becomes an alpha particle.

The correct option is C.

An alpha particle is a type of ionizing radiation consisting of two protons and two neutrons, essentially a helium nucleus without electrons. These particles have a relatively large mass and carry a positive charge, making them highly ionizing and potentially harmful if they interact with living tissue. Alpha particles are commonly emitted by certain radioactive materials, such as uranium and radon. Due to their limited penetration ability, alpha particles are primarily hazardous when ingested or inhaled, posing significant health risks, including an increased risk of cancer and tissue damage.

An alpha particle is identical to a helium nucleus. Alpha particles are a type of ionizing radiation that consist of two protons and two neutrons, which is also the composition of a helium nucleus without its electrons. In other words, when a helium atom loses its two electrons, it becomes an alpha particle. Thus, an alpha particle can be considered as a helium nucleus.

Hence  The correct option is C.

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Answer:

49 m/s

Explanation:

Initial potential energy = final kinetic energy

PE = KE

mgh = ½ mv²

v = √(2gh)

v = √(2 × 10 m/s² × 120 m)

v = 49 m/s

A material that can be represented by a chemical formula is a chemical compound.

What are chemical compounds?

Chemical compounds are substances made up of two or more different elements that are chemically bonded together in a specific arrangement. The elements in a compound can be either metal or nonmetal elements, or a combination of both.

Here,
A chemical compound is a substance made up of two or more different elements that are chemically bonded together. The chemical formula of a compound provides information about the types and numbers of atoms in a molecule of the compound.

For example, water is a chemical compound represented by the formula H2O, which tells us that each molecule of water contains two hydrogen atoms (H) and one oxygen atom (O) bonded together.

Chemical formulas are important tools for chemists to communicate information about the composition and structure of compounds. They allow scientists to predict how compounds will react and to design new compounds with desired properties.

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Answer:

v = 12,4 m/s

Explanation:

frictionless means all gravitational Energie (Eg) will be converted to kinetic Energie (Ek)

Ek = 0.5 * m * v^2

Ez = m * g * h

Ek = Ez

0.5 * m * v^2 = m * g * h

divide left and right of the = sign by m.

(This means that the final velocity is independent of the mass of both children !)

0.5 * v^2 = g * h

v^2 = 2 * g * h

v = +- SQRT (2 * g * h)

with

g = 9.8 m/s^2

h = 7,8 m/s

v = +- SQRT (2 * 9.8 * 7.8)

v = +- SQRT (152.88)

(v = - 12,4 m/s has no meaning in this case)

The velocity 7,8 m below the starting point, will be

v = 12,4 m/s

Answer:

the answer is 336.96 mph

Explanation:

hope this helps ^_~

It is called a Sea Stack.