All categories

3 years ago

Which is not a reason why the mass of an atom is expressed in atomic mass units rather than in grams?

Physics

2 answers:

satela [25.4K]3 years ago

6 0

Answer:

Ease of use and readability.

Explanation:

An atom of Oxygen, as an example, weighs 0.000...0001661 grams (with 23 zeros in front of "1661". In scientific notation this is written more concisely as

$1.661\cdot 10^{-24}g$

Still, in both cases the representation in units of grams is not easily readable and inconvenient to handle, especially when used in equations multiplying such mass with other measures. For this reason, the mass was agreed to be measured in atomic units, or a.u., which offer a numerically comparable baseline. An atomic unit for mass relates to the mass of an electron which is small enough to provide a good measurement unit. There are several variations to this so I recommend further reading if you need more detail.

TiliK225 [7]3 years ago

4 0

Scientists Could Not Agree On A Standard.

You might be interested in

hallar un numero de dos cifras sabiendo que la suma de las cifras es 12 y que la primera de ellas es el triple de la segunda

Natali [406]

Answer:

93 o 39.

Explanation:

Hola.

En este caso, podemos resolver este problema por medio del planteamiento de las siguientes ecuaciones:

1. Definimos x como el primer dígito y y como el segundo, por lo tanto, como su suma es 12, escribimos:

x + y = 12

2. Ahora, dado que el primer dígito, x es el triple del segundo, escribimos:

x = 3 y

De este modo, podemos resolver para y:

3 y + y = 12

4 y = 12

y = 12 / 4

y = 3

Y para x:

x = 3 y

x = 3 * 3

x = 9

Así, el número puede ser 93 o 39.

¡Saludos!

3 0

2 years ago

Ice skaters often end their performances with spin turns, where they spin very fast about their center of mass with their arms f

nekit [7.7K]

Answer:

Her angular speed (in rev/s) when her arms and one leg open outward is 1.4 rev/s

Explanation:

given information:

moment inertia of arm and leg when in, I₁ = 0.9 kgm²

moment inertia of arm and leg when extended, I₂ = 2.9 kgm²

angular speed when in, ω₁ = 4.5 rev/s

so, her angular speed (in rev/s) when her arms and one leg open outward is

L₁ = L₂

I₁ω₁ = I₂ω₂

ω₂ = I₁ω₁/I₂

= 0.9 x 4.5/2,9

= 1.4 rev/s

4 0

3 years ago

A 2.3 kg cart is rolling across a frictionless, horizontal track toward a 1.5 kg cart that is held initially at rest. The carts

4vir4ik [10]

Answer:

Part a)

$P = 7.5 kg m/s$

Part b)

$v = 3.26 m/s$

Explanation:

As we know that two carts are moving in opposite directions

so here total momentum of two carts must be given by vector subtraction

It is given as

$P = m_1\vec v_1 + m_2\vec v_2$

$P = (2.3)(4.5) + (1.5)(-1.9)$

$P = 7.5 kg m/s$

Now we know that total momentum of the system is conserved here as there is no external force on this system

so the speed of the first cart when second cart was at rest is given as

$P = m_1 v_1 + 0$

$7.5 = 2.3 v$

$v = 3.26 m/s$

5 0

3 years ago

Which is the main difference between cardio and strength training activities

Mekhanik [1.2K]

Cardio strengthens the circulatory system while strength training strengthens muscles and boost anaerobic endurance.

5 0

3 years ago

Suppose that a public address system emits sound uniformly in all directions and that there are no reflections. The intensity at

dybincka [34]

Answer:

The intensity at a spot 71 m away is $4.02*10^{-5} Wm^{-2}$

Explanation:

Given:

Initial intensity, $I_{1}=3.0*10^{-4} Wm^{-2}$ at a distance, $d_{1} = 26 m$

Required:

New intensity, $I_{2} =?$ at a distance, $d_{2} = 71 m$

Using the inverse square law,

I ∝ $\frac{1}{d^{2} }$

⇒ $I_{1}$ $I_{1}d_{1}^{2} =I_{2}d_{2}^{2}$

$I_{2} =\frac{I_{1} d_{1}^{2} }{d_{2}^{2}} =\frac{3.0*10^{-4}*26^{2} }{71^{2} } \\$ ×

$I_{2}=4.02*10^{-5} Wm^{-2}$

Thus, the intensity at a spot that is 71 m away is $4.02*10^{-5} Wm^{-2}$

5 0

3 years ago