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FrozenT [24]
3 years ago
12

An atomic scientist was studying an atom and through experimentation found that the total negative charge of the area surroundin

g the nucleus is -9. Which statement correctly describes this atom? A-This atom has nine clouds. B-This atom has nine electrons. C-This atom has nine neutrons. D-This atom has nine protons.
Physics
1 answer:
Mars2501 [29]3 years ago
4 0

Answer:

c  hhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhh

Explanation:

gerhr  fdhdrhedrzjhdrtuhe5eru

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The magnitude of the magnetic field at point P for a certain electromagnetic wave is 2.12 μT. What is the magnitude of the elect
valkas [14]

Answer:

The electric field is  E =  636 \ V/m

Explanation:

From the question we are told that

     The magnitude of magnetic field is B  =  2.12 \mu T  =  2.12*10^{-6} \ T

      The value for speed of light is  c =  3.0 *10^8 \ m/s

Generally the magnitude of the electric field at point P is

        E =  B * c

substituting values

         E =  2.12 *10^{-6} *  3.0 *10^{8}

         E =  636 \ V/m

8 0
3 years ago
A crate resting on a horizontal floor (\muμs = 0.61, \muμk = 0.3 ) has a horizontal force F = 49 Newtons applied to the right. T
Darya [45]

Answer:

a = 7.80 m/s²

Explanation:

given,

μs = 0.61

μk = 0.3

F = 49 N

we know,

F = μs m g

m = \dfrac{F}{\mu_s\ g}

m = \dfrac{49}{0.61 \times 9.81}

m = 8.19\ kg

now when the block start moving

F - F_k = F_{net}

F - F_k = ma

a = \dfrac{F}{m}-\dfrac{F_k}{m}

a = \dfrac{F}{m}-\dfrac{\mu_k m g}{m}

a = \dfrac{88}{8.19}-0.3\times 9.8

a = 7.80 m/s²

3 0
4 years ago
A cell membrane consists of an inner and outer wall separated by a distance of approximately 10nm10nm. Assume that the walls act
Mademuasel [1]

Answer:

the correct answue are  B, A, C, C, B

Explanation:

1) The electric field is requested, let's approximate the membrane by a parallel plate with surface charge density

         E = \frac{\sigma }{2 \epsilon_o }

         E = \frac{ 10^{-5}}{2 \ 8.85 \ 10^{-12}}

         E = 5.65 10⁵ N / C

the correct answer is B

2) A calcium ion has two positive charges, so the force applied by each side of the membrane (plate)

         F = q E

         F = 2  1.6 10⁻¹⁹  5.65 10⁵

         F = 1.8 10⁻¹³ N

the total force is the sum of the force of each membrane and the two forces go to the same side

         F = total = 2 F

         F_total = 3.6 10⁻¹³ N

the correct answer is A

3) the field and the electric potential are related

          ΔV = - E s

          ΔV = - 5.65 10⁵  10 10⁻⁹

          ΔV = - 5.65 10⁻³ V

          the correct answer is C

4) In the exercise they indicate that the outer wall has a positive charge, therefore, as they indicate that we approximate the system to a capacitor, the inner wall must be negatively charged.

The electric field goes from the positive to the negative charge, which is why it goes from the outer wall to the inner wall

the correct answer is C

5) For this part we use conservation of energy

starting point. On the inside wall, brown

            Em₀ = U = qV

final point. On the outside

             Em_f = K

energy is conserved

           Em₀ = Em_f

           q V = K

            K = 3 10⁻¹⁵  5.65 10⁻³

            K = 1.7 10⁻¹⁷ J

the correct answer is B

4 0
3 years ago
Two cars of the same mass have different velocities. Which car has more momentum?
never [62]

<u>Answer:</u>

<h3>The car with the higher velocity would have a more impactful momentum.</h3>
7 0
3 years ago
What do you mean by kinematics? ​
andrew11 [14]

Explanation:

study of motion of an object ...plzz if anyone knies the correct meaning of it ..do comment

7 0
3 years ago
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