All categories

3 years ago

An element is made up of?

2 answers:

7 0

When all atoms that make up a substance are the same, then that substance is an element. Elements are made of only one kind of atom. Because of this, elements are called "pure"

VladimirAG [237]3 years ago

5 0

Hey there!

An element is a substance made up only and entirely of one particular atom.

In fact- that's what makes an <em>element an element</em>. It's only made of one type of atom, and that's what makes it a singular substance that's used in the production of other substances.

If it had different types of atoms, it wouldn't be that singular element. The elements we have on the periodic table are the types of atoms and elements we know in order of atomic number. We know the most prominent, least prominent, and so on- but all of these elements are scattered throughout the world.

For example, steel is not an element- or a compound. It's an alloy, it's made of several different types of metals, each can be made of other types of metals, and when you go down to what <em>those</em> metals are made of- you get that one substance that's made up of one singular atom- an element.

Hope this helps!

You might be interested in

Coral reefs reduce the amount of carbon dioxide in the oceans. People have destroyed many natural coral reefs through pollution.

Mariulka [41]

The Answer is A!

Hope this helps :)

7 0

4 years ago

Two insulated wires, each 2.64 m long, are taped together to form a two-wire unit that is 2.64 m long. One wire carries a curren

nikklg [1K]

Answer:

$4.77\ \text{A}$

Explanation:

F = Magnetic force = 4.11 N

$I_n$ = Net current

$I_2$ = Current in one of the wires = 7.68 A

B = Magnetic field = 0.59 T

$\theta$ = Angle between current and magnetic field = $65^{\circ}$

$l$ = Length of wires = 2.64 m

$I$ = Current in the other wire

Magnetic force is given by

$F=I_nlB\sin\theta\\\Rightarrow I_n=\dfrac{F}{lB\sin\theta}\\\Rightarrow I_n=\dfrac{4.11}{2.64\times 0.59 \sin65^{\circ}}\\\Rightarrow I_n=2.91\ \text{A}$

Net current is given by

$I_n=I_2-I\\\Rightarrow I=I_2-I_n\\\Rightarrow I=7.68-2.91\\\Rightarrow I=4.77\ \text{A}$

The current I is $4.77\ \text{A}$ .

8 0

3 years ago

The force of a moving object is called momentum. The momentum of an object is proportional to its weight and speed. The more mom

dexar [7]

The force that a moving object exerts on another object upon colliding with it is rather the change in momentum divided by the amount of time elapsed during the collision.

F = Δp/Δt

F = force, Δp = change in momentum, Δt = elapsed time

Usually we say momentum is proportional to mass instead of saying momentum is proportional to weight. But sure, for two objects on the same planet, greater weight implies greater mass. Momentum is the product of mass and velocity:

p = mv

p = momentum, m = mass, v = velocity

So we have two identical cars on the same planet with one car traveling 30mph faster than the other. Let's say they both collide with a tree, both coming to a rest, and the collisions take the same amount of time to happen. The faster car loses a greater amount of momentum over the same amount of time, therefore delivering a greater force.

Choice B

4 0

3 years ago

What an object at rest stays at rest and an object in motion with the same speed and in the same direction unless acted upon by

GalinKa [24]

Answer:

True.

Explanation:

Newton's First Law of Motion states that every object continues in it's state of rest or of uniform motion in a straight line unless acted upon by an external force.

7 0

3 years ago

Read 2 more answers

A very small source of light that radiates uniformly in all directions produces an electric field amplitude of 8.45 V/m at a poi

Mandarinka [93]

Answer:

4.43 kW

Explanation:

Since Intensity I = P/A = E²/2cμ₀ where P = Power, A = Area = 4πr² where r = distance from source = 61 m and E = electric field amplitude = 8.45 V/m.

P = E²A/2cμ₀ = E²4πr²/2cμ₀ = 2πE²r²/cμ₀

= 2π(8.45 V/m)²(61 m)²/3 × 10⁸ m/s × 4π × 10⁻⁷ Tm/A

= 4428.1 W

= 4.4281 kW ≅ 4.43 kW

6 0

3 years ago