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2 years ago

The atomic mass of carbon-13 is 13. It has six protons. How many neutrons does this isotope have?

2 answers:

Ber [7]2 years ago

7 0

Carbon-13 will have 6 protons (because it is carbon), 6 electrons, and 7 neutrons. Isotopes have a different number of neutrons.

IgorC [24]2 years ago

3 0

Atomic mass is the given by the sum of the number of protons and number of neutron in the nucleus of the atom.

A = P + N

where A = atomic mass of the atom

P = number of protons in the nucleus of the atom

N = Number of neutrons in the nucleus of the atom

Given that :

A = atomic mass = 13

P = number of protons in the nucleus = 6

N = ?

Using the equation

A = P + N

13 = 6 + N

N = 13 - 6

N = 7

hence the isotope has 7 neutrons

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A maintenance worker wants to torque an engine bolt to 65.0 N m. If the torque wrench is 35cm in length, what is force applied t

harina [27]

Answer:

Force = 186 N

Explanation:

Torque is the rotational equivalent of linear force. It can be easely calculated using the formula :

$Torque = \vec{r} \times \vec{F}$

Where $\vec{r}$ is a vector that from the origin of the coordinate system to the point at which the force is applied (the position vector), $\vec{F}$ is the applied force.

The easiest way of computing the force is by setting the origin of the coordinate system to the lowest point of the torque wrench. By doing this we have that $r$ (the magnitud of the position vector) is 35cm.

Before computing the force we need to set all our values to the international system of units (SI). The torque is already in SI. The one missing is the length of the torque wrench (it is in centimeters and we need it in meters). So :

$35cm * \dfrac{1m}{100cm} = 0.35m$

Now using the torque formula:

$Torque = \vec{r} \times \vec{F}$

$Torque = rFsin(\theta)}$

Where $\theta$ is the smaller angle between the force and the position vector. Because the force is applied perpendiculary to the position vector $\theta = 90°$ , thus :

$Torque = rFsin(\theta)}$

$65 N m = (0.35m)Fsin(90°)}$

$F = \dfrac{65N m} {(0.35m)sin(90°)}$

$F = \dfrac{1300} {7}N$

so the force is approximately 186 N.

4 0

3 years ago

Which scientific term is defined as the rate at which work is accomplished?

Oliga [24]

Power is the scientific term defined as the rate at which work is accomplished. Power can be seen everywhere as it is applied to our everyday living. Power is seen when one pushes a heavy cart. It could be seen when a baseball hitter hits the ball.

7 0

3 years ago

PLeaSe SoMeBodY HeLp

Lerok [7]

1). Oört Cloud
2). Kuiper Belt
3). asteroids
4). meteorite

Note:
Your teacher doesn't need this information !
Your teacher needs for you to LEARN stuff.
You have the answers now, but until you memorize the information,
you haven't learned anything.

5 0

2 years ago

Two point charges of +2.50 x 10^-5 C and -2.50 x 10^-5 C are separated by 0.50m. Which of the following describes the force betw

mr Goodwill [35]

Answer:

Q1 = +2.50 x 10^-5C and Q2 = -2.50 x 10^-5C, r = 0.50m, F=?

Using Coulomb's law:

F = 1/(4πE) x Q1 x Q2/ r^2

Where

k= 1/(4πE) = 9 x 10^9Nm2/C2

Therefore,

F = 9x 10^9 x 2.50 x 10^-5 x2.50 x

10^-5/. ( 0.5)^2

F= 5.625/ 0.25

F= 22.5N approximately

F= 23N.

To find the direction of the force: since Q1 is positive and Q2 is negative, the force along Q1 and Q2 is force of attraction.

Hence To = 23N, attractive. C ans.

Thanks.

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2 years ago

Two engines create SIL values of 75 dB and 85 dB respectively. What dB reading would you expect when both are run simultaneously

stepladder [879]

Answer:

Explanation:

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3 years ago