# Which statement is the BEST definition of an atom? A) Anything that has mass and occupies space. B) The smallest particle that has the properties of an element. C) A substance that cannot be broken down chemically into simpler substances. Eliminate D) The smallest unit of a substance that exhibits all of the properties characteristic of that substance.

the answer is d because an atom is the smallest unit of a substance

## Related Questions

A squirrel (mass 0.9 kg) is running across the road at a speed 4.0 m/s. What is thesquirrel's kinetic energy?

The kinetic energy of the squirrel with a mass of 0.9 Kg running with a speed of 4 m/s is  7.5 J.

### What is kinetic energy?

Kinetic energy of an object is a form of energy generated by virtue of the motion of the object. Kinetic energy is dependent on the mass and velocity of the body.

When a body starts to move its potential energy starts to convert to kinetic energy and the kinetic energy will be maximum at the highest speed. When the object slow down and pause in a position it gains potential energy again.

The kinetic energy KE = 1/2 mv²

Given mass = 0.9 Kg

velocity = 4 m/s.

KE = 1/2 0.9 Kg × 4² m/s

= 7.5 J

Therefore, the kinetic energy of the squirrel is 7.5 J.

To find more on kinetic energy, refer here:

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A). Option A

B). Option B

C). Option B

Explanation:

The force applied when using a simple machine ??

Answer : I hope this helps !

The Effort Force is the force applied to a machine. Work input is the work done on a machine. The work input of a machine is equal to the effort force times the distance over which the effort force is exerted.

In physics, force is defined as a push or pull that can change the state of motion or shape of an object. When using a simple machine, the force applied is the input force or effort force. The amount of force required to operate a simple machine depends on its mechanical advantage.

### Explanation:

In physics, force is defined as a push or pull that can change the state of motion or shape of an object. When using a simple machine, such as a lever or pulley, the force applied is the input force or effort force.

The amount of force required to operate a simple machine depends on its mechanical advantage. Mechanical advantage is the ratio of the output force to the input force.

For example, if you are using a lever with a mechanical advantage of 3, and you apply an input force of 10 Newtons, the output force will be 3 times greater, which is 30 Newtons.

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5. Is it likely that light with frequencies higher than ultraviolet wasthe main cause of Tía Ana’s cataracts? Explain why or why not.

Explanation:

If Tia Ana exposes her eyes to light ray in which it frequency is higher than ultraviolet ray, it may result to a gradual eyes issue such as cataracts as the radiation damages the cornea and the lens in front of the eyes.

What tends to exist in periodic table?

The arrangement of the chemical elements, ordered by their atomic number, electron configuration , and recurring chemical properties.

All charged objects create an electric field around them. What two factors determine the strength of two electric fields upon the charged objects creating them?

-- The product of the magnitudes of the two charges.
-- The distance between the centers of the two charges.

The signs of the charges ... whether their signs are the same
or opposite ... determines the direction of the forces, but not
their magnitude.

Where is the magnetic field of a bar magnet the strongest? A.
at the north and south poles

B.
next to the south pole

C.
in the middle of the magnet

D.
between the north and south poles