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3 years ago

A sodium ion, Na+ , has a positive charge because it

Physics

1 answer:

goldenfox [79]3 years ago

3 0

D. lost an electron

because they have free electron in the outermost shell which they will like to denote, in order to attain stable configuration

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A projectile is fired at an angle above the level ground. Where does it have maximum kinetic energy? Is it right when it leaves

Lorico [155]

You can approach this problem in an analytical way. The formula for kinetic energy is 1/2*mv². Throughout the projectile motion, mass is constant. Therefore, it wholly depends on the velocity.<em> So, the maximum kinetic energy is when the object travels the fastest. This is right when it leaves the launcher, and the moment just before it hits the ground.</em>

5 0

3 years ago

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A 68 kg hiker walks at 5.0 km/h up a 3% slope. The indicated incline is the ratio of the vertical distance and the horizontal di

sertanlavr [38]

Answer:

$P = 27.8 Watt$

Explanation:

As we know that the slope of the inclination is 3%

so we can say that

$tan\theta = 0.03$

since it is very small so here we can take approximation as

$tan\theta = sin\theta = 0.03$

so we need to find the metabolic power which is given as

$P = F. v$

so here we have

$F = mg sin\theta$

$v = 5 km/h = 1.39 m/s$

now we have

$P = (68)(9.81)(0.03)(1.39)$

$P = 27.8 Watt$

3 0

3 years ago

The maximum number of electrons in the second energy level of an atom is ____.

ehidna [41]

Your answer will be 8.

6 0

3 years ago

-What can you say about the snowboarder’s kinetic energy as he moves?

Damm [24]

Answer:

His kinetic energy increases, potential energy decreases

The sum of kinetic and potential energy is a constant at any instant before he comes to rest.

Explanation:

Snowboarder is starting from a height and moving to the down direction. As he moves down his velocity increases, we know that kinetic energy is given by the expression $\frac{1}{2} mv^2$ , so as he moves his kinetic energy increases.

When the snowboarder is starting his potential energy is maximum(Potential energy = mgh), as he comes down his potential energy decreases.

Based on this we can conclude that the sum of potential energy and kinetic energy is a constant at any instant for a snowboarder before he comes to rest.

mgh+ $\frac{1}{2} mv^2$ = Constant

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4 years ago

What medium is often used to transfer computer information?

Anika [276]

Optic fiber is the medium that is often used to transfer computer information

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4 years ago

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