Ask question

Ask question

All categories

Sunny_sXe [5.5K]

3 years ago

12

Help with atomic mass

2 answers:

gizmo_the_mogwai [7]3 years ago

8 0

I did the boron

Phosphorus-
Atomic number: 15
Atomic mass: 30.974
Number of protons: 15
Number of electrons: 15
Number of neutrons: 15

Potassium-
Atomic number: 19
Atomic mass: 39.098
Number of protons: 19
Number of electrons: 19
Number of neutrons: 20

Carbon-
Atomic number: 6
Atomic mass: 12.011
Number of protons: 6
Number of electrons: 6
Number of neutrons: 6

Hope this helps

-Zayn Malik

Dafna1 [17]3 years ago

3 0

Explanation:

what?? do you please say clearly

You might be interested in

A drag racing car with a weight of 1600 lbf attains a speed of 270 mph in a quarter-mile race. Immediately after passing the tim

Kaylis [27]

Answer:

15.065ft

Explanation:

To solve this problem it is necessary to consider the aerodynamic concepts related to the Drag Force.

By definition the drag force is expressed as:

$F_D = -\frac{1}{2}\rho V^2 C_d A$

Where

$\rho$ is the density of the flow

V = Velocity

$C_d$ = Drag coefficient

A = Area

For a Car is defined the drag coefficient as 0.3, while the density of air in normal conditions is 1.21kg/m^3

For second Newton's Law the Force is also defined as,

$F=ma=m\frac{dV}{dt}$

Equating both equations we have:

$m\frac{dV}{dt}=-\frac{1}{2}\rho V^2 C_d A$

$m(dV)=-\frac{1}{2}\rho C_d A (dt)$

$\frac{1}{V^2 }(dV)=-\frac{1}{2m}\rho C_d A (dt)$

Integrating

$\int \frac{1}{V^2 }(dV)= - \int\frac{1}{2m}\rho C_d A (dt)$

$-\frac{1}{V}\big|^{V_f}_{V_i}=\frac{1}{2m}(\rho)C_d (\pi r^2) \Delta t$

Here,

$V_f = 60mph = 26.82m/s$

$V_i = 120.7m/s$

$m= 1600lbf = 725.747Kg$

$\rho = 1.21 kg/m^3$

$C_d = 0.3$

$\Delta t=7s$

Replacing:

$\frac{-1}{26.82}+\frac{1}{120.7} = \frac{1}{2(725.747)}(1.21)(0.3)(\pi r^2) (7)$

$-0.029 = -5.4997r^2$

$r = 2.2963m$

$d= r*2 = 4.592m \approx 15.065ft$

4 0

4 years ago

What is the resultant force on the human cannonball in the

Svetllana [295]

Answer:

heart

Explanation:

4 0

3 years ago

Which statement describes how this diagram could be changed so that it

Dominik [7]

Answer:

b. add a magnetic metal core

Explanation:

a p e x test

8 0

3 years ago

Read 2 more answers

Describe the motion of a person who is standing on the earths surface

oee [108]

They are rotating because the earth never stops rotating.

8 0

3 years ago

If you double the wavelength, the electromagnetic radiation energy will double. The energy of the electromagnetic radiation will

Sedbober [7]

Answer:

It's energy will double.

Explanation:

This is because energy, E, is related to frequency, f, by:

E = hf

Where h = Planck's constant

So, double frequency will be 2f

=> E(2f) = 2hf = 2E.

Hence, energy is doubled.

7 0

3 years ago