Energy a substance or system has because of its motion Is what?

astraxan [27]

Answer:

A) & B)

Explanation:

First, the numbers 12 and 13 represent the atomic mass number of the atoms.

So, A) is true: thus Carbon12 and Carbon 13 have different mass numbers.

The mass number is equal to the total number of protons and neutrons. Consider that any element has the same number of protons, regardless of the number of neutrons. The number of protons in Carbon is 6.

The amount of neutrons can be calculated by: mass number minus number of protons.

For Carbon 12: $12-6=6$

For Carbon 13: $13-6=7$

B) is true, we just proved they have different amounts of neutrons.

In order for the charge of the atom to be neutral, the amount of electrons must be equal to the number of protons (as they have opposite charges). And we now know that the number of protons in Carbon12 and Carbon13 are always the same

C) is false, the number of electrons is the same in both atoms

The atomic charges in both are neutral, due to the fact that they have the same amount of protons and electrons in both cases. Is only the neutrons (thus the mass numbers)that change

D) is false, they have equal atomic charges

4 0

3 years ago

Particle A of charge 2.76 10-4 C is at the origin, particle B of charge -6.54 10-4 C is at (4.00 m, 0), and particle C of charge

Vanyuwa [196]

Answer:

a) F_net = 30.47 N , θ = 10.6º

b) Fₓ = 29.95 N

Explanation:

For this exercise we use coulomb's law

F₁₂ = k $k \frac{ q_{1} \ q_{2} }{ r^{2} }$

the direction of the force is on the line between the two charges and the sense is repulsive if the charges are equal and attractive if the charges are different.

As we have several charges, the easiest way to solve the problem is to add the components of the force in each axis, see attached for a diagram of the forces

X axis

Fₓ = $F_{bc x}$

Y axis

$F_{y}$ Fy = $F_{ab} - F_{bc y}$

let's find the magnitude of each force

$F_{ab}$ = 9 10⁹ 2.76 10⁻⁴ 1.02 10⁻⁴ / 3²

F_{ab} = 2.82 10¹ N

F_{ab} = 28.2 N

$F_{bc}$ = 9 10⁹ 6.54 10⁻⁴ 1.02 10⁻⁴ / 4²

F_{bc} = 3.75 10¹ N

F_{bc} = 37.5 N

let's use trigonometry to decompose this force

tan θ = y / x

θ = tan⁻¹ and x

θ= tan⁻¹ ¾

θ = 37º

let's break down the force

sin 37 = F_{bcy} / F_{bc}

F_{bcy} = F_{bc} sin 37

F_{bcy} = 37.5 sin 37

F_{bcy} = 22.57 N

cos 37 = F_{bcx} /F_{bc}

F_{bcx} = F_{bc} cos 37

F_{bcx} = 37.5 cos 37

F_{bcx} = 29.95 N

let's do the sum to find the net force

X axis

Fₓ = 29.95 N

Axis y

Fy = 28.2 -22.57

Fy = 5.63 N

we can give the result in two ways

a) F_net = Fₓ i ^ + $F_{y}$ j ^

F_net = 29.95 i ^ + 5.63 j ^

b) in the form of module and angle

let's use the Pythagorean theorem

F_net = $\sqrt{ F_{x}^2 + F_{y}^2 }$

F_net = √(29.95² + 5.63²)

F_net = 30.47 N

we use trigonometry for the direction

tan θ= $\frac{ F_{y} }{ F_{x} }$

θ = tan⁻¹ \frac{ F_{y} }{ F_{x} }

θ = tan⁻¹ (5.63 / 29.95)

θ = 10.6º

3 0

3 years ago

Which change to a circuit is most likely to decrease its electrical power?

Harlamova29_29 [7]

Answer:

It's D

Explanation:

8 0

2 years ago

Read 2 more answers

Friction removes energy from objects in motion. Which statement best describes how this works?

xenn [34]

friction transforms KE into thermal energy (a)

That's why, if it goes on long enough, the moving object actually gets warm.

8 0

3 years ago

If six moles of hydrogen chloride (HCl) react with plenty of aluminum, how many moles of aluminum chloride (AlCl3) will the reac

AlexFokin [52]

Answer:

Two moles of aluminum chloride $(AlCl_3)$ are produced when six miles of hydrogen Chloride $(HCl)$ react with plenty of aluminum

Explanation:

6 Moles of $HCl$ will only react with 2 moles of $Al$ irrespective of the number of moles of each compound present. The reaction wiil take place in this ratio only. The products produced will be 2 moles of $AlCl_3$ and 3 moles of $H_2$ this ratio will also be constant.

So, six moles of hydrogen chloride $(HCl)$ will react with plenty of aluminum to produce many 2 moles of aluminum chloride $(AlCl_3)$ .

5 0

3 years ago