3 years ago

If the Mass Number is the sum of the protons and neutrons in an atom, what is the mass number of

Physics

1 answer:

gogolik [260]3 years ago

4 0

Answer:

It's 31

Explanation:

add 15 and 16

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Shayla was late for school. She ran the last half mile in 4 minutes. What was her average speed in miles per hour?

Shtirlitz [24]

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Explanation:

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3 years ago

Calculate the magnitude of the acceleration due to gravity on the surface of Earth due to the Moon.

Fudgin [204]

Answer:

$g'_h=1.096\times 10^{-5}\ m.s^{-2}$

Explanation:

We know that the gravity on the surface of the moon is,

$g'=\frac{g}{6}$

$g'=1.63\ m.s^{-2}$

<u>Gravity at a height h above the surface of the moon will be given as:</u>

$g'_h=\frac{G.m}{(r+h)^2}$ ..........................(1)

where:

G = universal gravitational constant

m = mass of the moon

r = radius of moon

We have:

$G=6.67\times 10^{-11}\ m^3.s^{-2}.kg^{-1}$

$m=7.35\times 10^{22}\ kg$

$r=1.74\times 10^6\ m$

$h=384.4\times 10^6\ m$ is the distance between the surface of the earth and the moon.

Now put the respective values in eq. (1)

$g'_h=\frac{6.67\times 10^{-11}\times 7.35\times 10^{22}}{(1.74\times 10^6+384.4\times 10^6)^2}$

$g'_h=1.096\times 10^{-5}\ m.s^{-2}$ is the gravity on the moon the earth-surface.

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3 years ago

When there is no number in front of a chemical formula in a chemical equation, what number is understood?

Andre45 [30]

<span>The number in front is the number of molecules (or atoms) taking part in the (balanced) chemical reaction equation.</span>

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3 years ago

Mandy is testing an unknown solution to determine whether it is an acid or a base. She places a piece of red litmus paper into t

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Is the alien theory a scientific claim? Why or why not?

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I'm not sure what the alien Theory says or if there really is such a theory. If the theory says that aliens definitely exist and that they have visited Earth in the past then the theory is totally and completely without any kind of support. It's not scientific in any way because there is no evidence for such a claim. It may be thought to be probable but no solid evidence has ever been presented.

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3 years ago

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