All categories

3 years ago

if fluorine is neutral what would its atomic mass number, number of protons, number of neutrons, and number of electrons be

Physics

1 answer:

Eddi Din [679]3 years ago

4 0

Answer:

Fluorine is the 9th element of the periodic table. If its Neutral... It'll have an atomic mass of 19. Also Since its neutral... Number of protons and Electrons will be the same which is 9. Now the Neutron number is the Mass number - The atomic no = 19-9 = 10Neutrons

You might be interested in

What is the speed of a walking person in m/s if the person travels 1000 m in 20 minutes?

Nata [24]

Answer:

0.83m/s

Explanation:

Given parameters:

distance = 1000m

time taken = 20min

Unknown:

Speed of the walking person = ?

Solution:

To solve this problem;

Speed = $\frac{distance}{time taken}$

Time taken should be in seconds;

1 min = 60s

20min = 20 x 60 = 1200s

Speed = $\frac{1000}{1200}$ = 0.83m/s

8 0

3 years ago

A 2.35-kg rock is released from rest at a height of 21.4 m. Ignore air resistance and determine (a) the kinetic energy at 21.4 m

kvasek [131]

Explanation:

Given that,

The mass of rock, m = 2.35-kg

It was released from rest at a height of 21.4 m.

(a) The kinetic energy is given by : $E_k=\dfrac{1}{2}mv^2$

As the rock was at rest initially, it means, its kinetic energy is equal to 0.

(b) The gravitational potential energy is given by : $E_p=mgh$

It can be calculated as :

$E_p=2.35\times 9.8\times 21.4\\\\E_p=492.84\ J$

M = 0 J + 492.84 J

M = 492.84 J

Hence, this is the required solution.

6 0

3 years ago

A mass hangs on the end of a massless rope. The pendulum is held horizontal and released from rest. When the mass reaches the bo

drek231 [11]

Answer:

$T = 37.5 N$

Explanation:

As the pendulum reached to the lowest position then we will have

$T - mg = \frac{mv^2}{L}$

$14.2 - m(9.81) = \frac{m(2.9^2)}{L}$

now when it will reach to the height of the peg then its speed is given as

$v_f^2 - v_i^2 = 2 a d$

so we will have

$v_f^2 - 2.9^2 = 2(-9.81)(\frac{L}{5})$

$v_f^2 = 2.9^2 - 3.924L$

also we know that

$2.9^2 - 0 = 2(9.81)(L)$

$L = 0.43 m$

$m = 0.48 kg$

now we have speed of the pendulum when it reach the same height is given as

$v_f^2 = 2.9^2 - (3.924(0.43)$

$v_f = 2.6 m/s$

Now the tension in the string is given as

$T = \frac{mv_f^2}{\frac{L}{5}}$

$T = \frac{0.48(2.6)^2}{\frac{0.43}{5}}$

$T = 37.5 N$

6 0

4 years ago

Divers in Acapulco dive from a cliff that is 65 m high. If the rocks

Alex777 [14]

Answer:

Cool question! First step is to find the time taken to fall

, then to find the horizontal velocity needed to cover

in that time. In this case the answer is

7.0

−

Explanation:

This is a less typical projectile motion question, but it's still projectile motion. This means the horizontal and vertical directions can be considered separately. We assume that the initial vertical velocity,

−

, and we are trying to find the required initial horizontal velocity,

To find the time taken to fall

Since

, we can rearrange this to:

√

⋅

9.8

3.41

The horizontal velocity will be constant (ignoring air resistance), so to cover

3.41

will be given by:

→

3.41

7.0

−

Answer link

5 0

2 years ago

An electrical current passing through a wire generates

koban [17]

The correct answer is B

3 0

3 years ago