3 years ago

What kind of electric charge does an atom have answer.com?

Physics

2 answers:

Bond [772]3 years ago

5 0

It's negative electric charge

Tresset [83]3 years ago

5 0

Atoms of "ordinary" matter have a dense positively charged nucleus (containing protons and/or neutrons) with electrons moving around it while antimatter has a dense negatively charged nucleus (containing antiprotons and antineutrons) with positrons moving around it.

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A positron undergoes a displacement ∆r= 2i -3j+6k, ending with the position vector r= 3j-4k, in meters. what was the positron's

Margaret [11]

$\Delta{r}=2i-3j+6k \\r_f = 3j-4k \\\Delta{r}=r_f-r_0\Longrightarrow2i-3j+6k=3j-4k-r_0 \\r_0=2i-3j+6k+3j-4k=\boxed{2i+6j+10k}$

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3 years ago

An illustration of the major tectonic plates is provided below.

Julli [10]

Answer:

Plate A

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3 years ago

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The graph represents velocity over time. What is the acceleration? –0.4 m/s2 –0.2 m/s2 0.2 m/s2 0.4 m/s2

Olenka [21]

Missing graph. I attach it in the answer.

In a uniformly accelerated motion, the velocity at time t is given by:
$v(t)=at$
where a is the acceleration and t is the time.

Given the previous equation, if we plot v(t) versus t, we find a straight line; moreover, a (the acceleration) represents the slope of the curve.

Looking at the graph, we see that when the time goes from 10 s to 20 s, the velocity increases from 4 m/s to 6 m/s. Therefore the slope of the curve is
$a= \frac{\Delta v}{\Delta t}= \frac{6 m/s-4 m/s}{20 s-10 s}= \frac{2 m/s}{10 s}=0.2 m/s^2$
and this corresponds to the acceleration.

So, the correct answer is <span>0.2 m/s2.</span>