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3 years ago

How many protons and neutrons are present in an atom of 3919k? express your answer as integers separated by a comma?

1 answer:

7 0

To determine the number of protons and neutrons, you need to understand what are the meaning of the numbers written with the atom. The number that is written above the atom represents the mass number of the atom. The mass number is the sum of the number of protons and neutrons in the atom. The one written below would represent the atomic number of the atom and this represents the number of protons in the atom. So, for this case, mass number would be 39 and the atomic number would be 19. Therefore, the number of protons would be 19 and the number of neutrons would be 39-19=20.

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How much heat is needed to raise the temperature of 50.0 g of water by 25.0°C

love history [14]

Answer:

Explanation:

In order to be able to solve this problem, you will need to know the value of water's specific heat, which is listed as

4.18

∘

Now, let's assume that you don't know the equation that allows you to plug in your values and find how much heat would be needed to heat that much water by that many degrees Celsius.

Take a look at the specific heat of water. As you know, a substance's specific heat tells you how much heat is needed in order to increase the temperature of

1 g

of that substance by

∘

In water's case, you need to provide

4.18 J

of heat per gram of water to increase its temperature by

∘

What if you wanted to increase the temperature of

1 g

of water by

∘

? You'd need to provide it with

increase by 1

∘



4.18 J

increase by 1

∘



4.18 J

increase by 2

∘



4.18 J

To increase the temperature of

1 g

of water by

∘

, you'd need to supply it with

increase by 1

∘



4.18 J

increase by 1

∘



4.18 J

...

increase by n

∘



4.18 J

Now let's say that you wanted to cause a

∘

increase in a

2-g

sample of water. You'd need to provide it with

for 1 g of water



4.18 J

for 1 g of water



4.18 J

for 2 g of water



4.18 J

To cause a

∘

increase in the temperature of

grams of water, you'd need to supply it with

for 1 g of water



4.18 J

for 1 g of water



4.18 J

,,,

for m g of water



4.18 J

This means that in order to increase the temperature of

grams of water by

∘

, you need to provide it with

heat

specific heat

This will account for increasing the temperature of the first gram of the sample by

∘

, of the the second gram by

∘

, of the third gram by

∘

, and so on until you reach

grams of water.

And there you have it. The equation that describes all this will thus be

⋅

, where

- heat absorbed

- the mass of the sample

- the specific heat of the substance

- the change in temperature, defined as final temperature minus initial temperature

In your case, you will have

100.0

⋅

4.18

∘

⋅

(

50.0

−

25.0

)

∘

10,450 J

Rounded to three sig figs and expressed in kilojoules, t

Explanation:

3 0

3 years ago

Read 2 more answers

A woman climbs up a ladder in 1.37 s at 2.20 m/s. How tall is the ladder?

ArbitrLikvidat [17]

Answer:

The ladder is 3.014 m tall.

Explanation:

To solve this problem, we must use the following formula:

v = x/t

where v represents the woman’s velocity, x represents the distance she climbed (the height of the ladder), and t represents the time it took her to move this distance

If we plug in the values we are given for the problem, we get:

v = x/t

2.20 = x/1.37

To solve this equation for x (the height of the ladder), we must multiply both sides by 1.37. If we do this, we get:

x = (2.20 * 1.37)

x = 3.014 m

Therefore, the ladder is 3.014 m tall.

Hope this helps!

6 0

3 years ago

Read 2 more answers

Drug abuse is characterized by _____.

arlik [135]

There can be mental health effects and psychological dependence

8 0

2 years ago

Read 2 more answers

Three packing crates of masses, M1 = 6 kg, M2 = 2 kg and M3 = 8 kg are connected by a light string of negligible mass that passe

never [62]

Answer:

39.81 N

Explanation:

I attached an image of the free body diagrams I drew of crate #1 and #2.

Using these diagram, we can set up a system of equations for the sum of forces in the x and y direction.

∑Fₓ = maₓ

∑Fᵧ = maᵧ

Let's start with the free body diagram for crate #2. Let's set the positive direction on top and the negative direction on the bottom. We can see that the forces acting on crate #2 are in the y-direction, so let's use Newton's 2nd Law to write this equation:

∑Fᵧ = maᵧ
T₁ - m₂g = m₂aᵧ

Note that the tension and acceleration are constant throughout the system since the string has a negligible mass. Therefore, we don't really need to write the subscripts under T and a, but I am doing so just so there is no confusion.

Let's solve for T in the equation...

T₁ = m₂aᵧ + m₂g
T₁ = m₂(a + g)

We'll come back to this equation later. Now let's go to the free body diagram for crate #1.

We want to solve for the forces in the x-direction now. Let's set the leftwards direction to be positive and the rightwards direction to be negative.

∑Fₓ = maₓ

F_f - F_g sinΘ = maₓ

The normal force is equal to the x-component of the force of gravity.

(F_n · μ_k) - m₁g sinΘ = m₁aₓ

(F_g cosΘ · μ_k) - m₁g sinΘ = m₁aₓ
[m₁g cos(30) · 0.28] - [m₁g sin(30)] = m₁aₓ
[(6)(9.8)cos(30) · 0.28] - [(6)(9.8)sin(30)] = (6)aₓ
[2.539595871] - [-58.0962595] = 6aₓ
60.63585537 = 6aₓ
aₓ = 10.1059759 m/s²

Now let's go back to this equation:

T₁ = m₂(a + g)

We have 3 known variables and we can solve for the tension force.

T = 2(10.1059759 + 9.8)
T = 2(19.9059759)
T = 39.8119518 N

The tension force is the same throughout the string, therefore, the tension in the string connecting M2 and M3 is 39.81 N.

3 0

2 years ago

An electric motor converts electrical energy into______<br>energy

faltersainse [42]

Mechanical energy is the answer

7 0

2 years ago