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3 years ago

Why do atoms have an overall neutral charge?

Physics

2 answers:

lbvjy [14]3 years ago

7 0

Answer:

Explanation:

An atom has equal number of protons and electrons. The charge of an electron and a proton is same but opposite in nature. So, the total charge on the atom is zero and thus an atom is said to be neutral.

Y_Kistochka [10]3 years ago

6 0

Atoms have an overall charge that is neutral because atoms have equal number of positive protons and negative electrons thus they cancel each other out. This always true for atoms that are stable and in equilibrium.

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You have two steel solid spheres. sphere 2 has twice the radius of sphere 1. part a by what factor does the moment of inertia i2

sertanlavr [38]

Answer:

moment of inertia of sphere 2 is 32 times the moment of inertia of sphere 1

Explanation:

The moment of inertia of a solid sphere about its axis is

$I=\frac{2}{5}MR^2$

where

M is the mass of the sphere

R is the radius of the sphere

The mass of the sphere can be rewritten as

$M=\rho V$

where

$\rho$ is the density

$V=\frac{4}{3}\pi R^3$ is the volume of the sphere

So the moment of inertia becomes

$I=\frac{2}{5}(\frac{4}{3}\pi \rho R^3)R^2 = \frac{8}{15}\pi \rho R^5$

Calling R the radius of sphere 1, the moment of inertia of sphere 1 is

$I_1=\frac{8}{15}\pi \rho R^5$

where $\rho$ is the density of steel, since the sphere is made of steel

Sphere 2 has twice the radius of sphere 1, so

R' = 2R

and so its moment of inertia is

$I_2=\frac{8}{15}\pi \rho R'^5=\frac{8}{15}\pi \rho (2R)^5=32(\frac{8}{15}\pi \rho R^5)=32I_1$

So, the moment of inertia of sphere 2 is 4 times the moment of inertia of sphere 1.

4 0

3 years ago

Alpha radiation is ______.

KonstantinChe [14]

B because alpha radiation is just the amount of alpha particles, c could also be plausible but i think gamma rays are more deadly

3 0

3 years ago

Please help me. Clear answer please and the formula and everything

Diano4ka-milaya [45]

(a) At level A Potential Energy is 2940 J.

(b) At level B Potential Energy is 1960 J.

(d) At level D Potential energy is 0 J.

(e) The change in Potential energy if the object moves from A to B is 980 J.

<u>Explanation</u>:

Given that,

Mass of an object is 5 kg (m) at a height of 60 m (h) above the ground as shown in the given figure.

Potential energy of an object is calculated by using the formula m × g × h. “g” is acceleration due to gravity on earth is 9.8 $m/s^2$ .

(a) At level A:

At height (h) is 60 m above ground.

Potential energy = 5 × 9.8 × 60

Potential energy = 2940 J

(b) At level B:

At height (h) is 40 m above ground.

Potential energy = 5 × 9.8 × 40

Potential energy = 1960 J

(c) At level C:

At height (h) is 30 m above ground.

Potential energy = 5 × 9.8 × 30

Potential energy = 1470 J

(d) At level D:

At height (h) is 0 m above ground (object is on the ground).

Potential energy = 5 × 9.8 × 0

Potential energy = 0 J

(e) Change in “Potential energy” when it moves from “A” to “B”

Change in “Potential energy” in difference in initial “Potential energy” (at level A) and final “Potential energy” (at level B)

= 2940 - 1960

= 980 J

Therefore, change in “Potential energy” is 980 J.

3 0

4 years ago

Which of the following has the largest inertia?

Shkiper50 [21]

Option D, a semi truck parked in a parking lot

Reason: Inertia is the state of a body which needs a force to come into the act of motion.

The more massive the object is the more is its inertia.

5 0

4 years ago

Many streets and parking lots are illuminated with ???

lora16 [44]

The streets are illuminated with sodium vapor lights. hope this helps!!!!!!

4 0

3 years ago

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