How do I find the atomic mass of an element?

Physics

2 answers:

jeka57 [31]3 years ago

7 0

Answer:I need this too!

Explanation:

fgiga [73]3 years ago

5 0

You take the mass number and subtract the number of neutrons

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Arigid body must rotate about an axis in order for it to have angular momentum about that axis. True False

kompoz [17]

Answer:

False

Explanation:

Let's consider the definition of the angular momentum,

$\vec{L} = I \vec{\omega}$

where $I = \int\limits_m r^2 dm = \lim_{n \to \infty} \sum\limits_{i=1}^n m_i r_i^2$ is the moment of inertia for a rigid body. Now, this moment of inertia could change if we change the axis of rotation, because "r" is defined as the distance between the puntual mass and the nearest point on the axis of rotation, but still it's going to have some value. On the other hand,

$\vec{\omega} = \frac{\vec{r} \times \vec{v}}{r^2}$ so $\vec{\omega} \neq 0$ unless $\vec{r}$ ║ $\vec{v}$ .

In conclusion, a rigid body could rotate about certain axis, generating an angular momentum, but if you choose another axis, there could be some parts of the rigid body rotating around the new axis, especially if there is a projection of the old axis in the new one.

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3 years ago

A car is running at a velocity of 50 miles per hour and the driver accelerates the car by 10 miles per hour square.How far the c

krek1111 [17]

It will be 80 miles and it can be done only in 16 min

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3 years ago

Read 2 more answers

The distance traveled by a wave during a single period is

White raven [17]

I think it's wavelength
Hope I helped.

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