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2 years ago

The nuclues of an atom contains which subatomic particles

Physics

1 answer:

Umnica [9.8K]2 years ago

3 0

Protons and neutrons. Explanation:
Protons are massive, positively charged
nuclear particles.

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1. A diver jumps from a 13 m tower, with no initial velocity.

Valentin [98]

Answer:

Assuming that air resistance is negligible.

a. Approximately $16.1\; {\rm m\cdot s^{-1}}$ .

b. Approximately $19.0\; {\rm m \cdot s^{-1}}$ .

Explanation:

Let $m$ denote the mass of this diver.

If the initial speed of the diver is $v_{0}$ , the initial kinetic energy ( $\text{KE}$ ) of this diver would be $(1/2)\, m \, {v_{0}}^{2}$ .

If the height of this diver is $h$ , the gravitational potential energy ( $\text{GPE}$ ) of this diver would be $m\, g \, h$ .

The initial mechanical energy of this diver (sum of $\text{KE}$ and $\text{GPE}$ ) would thus be: $(((1/2)\, m\, {v_{0}}^{2}) + (m\, g\, h}))$ .

If air resistance on the diver is negligible, the mechanical energy of this diver would stay the same until right before the diver impacts the water. The entirety of the initial mechanical energy, $(((1/2)\, m\, {v_{0}}^{2}) + (m\, g\, h}))$ , would be converted to kinetic energy by the time of impact.

Rearrange the equation $\text{KE} = (1/2)\, m\, v^{2}$ to find an expression for the speed of the diver:

$\begin{aligned} v = \sqrt{\frac{2\, \text{KE}}{m}}\end{aligned}$ .

Thus, if the kinetic energy of the diver is $(((1/2)\, m\, {v_{0}}^{2}) + (m\, g\, h}))$ , the speed of the diver would be:

$\begin{aligned} v &= \sqrt{\frac{2\, \text{KE}}{m}} \\ &= \sqrt{2\times \frac{(1/2)\, m\, {v_{0}}^{2} + (m\, g\, h)}{m}} \\ &= \sqrt{2 \times ((1/2)\, {v_{0}}^{2}) + (g\, h))} \\ &= \sqrt{{v_{0}}^{2} + 2\, g\, h}\end{aligned}$ .

Notice how $m$ , the mass of the diver was eliminated from the expression.

If the diver started with no initial speed ( $v_{0} = 0\; {\rm m\cdot s^{-1}}$ ) at a height of $h = 13\; {\rm m}$ , the speed of the diver right before impact with water would:

$\begin{aligned} v &= \sqrt{{v_{0}}^{2} + 2\, g\, h} \\ &= \sqrt{{(0\; {\rm m\cdot s^{-1}})}^{2} + (2 \times 10\; {\rm m\cdot s^{-2} \times 13\; {\rm m})} \\ &\approx 16.1\; {\rm m\cdot s^{-1}}\end{aligned}$ .

If the diver started with an initial velocity of $10\; {\rm m\cdot s^{-1}}$ upwards (initial speed $v_{0} = 10\; {\rm m\cdot s^{-1}}$ ) from a height of $h = 13\; {\rm m}$ , the speed of the diver right before impact with water would be:

$\begin{aligned} v &= \sqrt{{v_{0}}^{2} + 2\, g\, h} \\ &= \sqrt{{(10\; {\rm m\cdot s^{-1}})}^{2} + (2 \times 10\; {\rm m\cdot s^{-2} \times 13\; {\rm m})} \\ &\approx 19.0 \; {\rm m\cdot s^{-1}}\end{aligned}$ .

5 0

3 years ago

How are adhesion and cohesion similar? how are they different?

hichkok12 [17]

they're both properties of water. both involve the "sticking" property of H2O . cohesion is "sticking" together (water sticking to water) and adhesios is water
 "sticking" to something else. They are both important to life processes.

In chemistry, adhesion refers to the tendency of unlike molecules to bond with one another, while cohesion refers to the attractive force between molecules of the same type. Surface tension, which is an essential property of water, illustrates the relationship between adhesion and cohesion.

4 0

3 years ago

How many cubic meters of habitable space was available in skylab?

loris [4]

361 cubic meters of habitable space was available in the skylab. None of the given options are correct.

<h3>Who launched skylab?</h3>

NASA launched the first American space station, called Skylab.

The fuel tank of the Saturn SIV-B rocket stage served as the Skylab's residential quarters.

Skylab's livable capacity was large in comparison to the spacecraft that American astronauts had previously used 361 cubic meters.

Skylab offered 361 cubic meters of livable area.

Hence, none of the given options is correct.

To learn more about the skylab refer;

brainly.com/question/23389881

#SPJ1

4 0

2 years ago

A mass movement that involves the sudden movement of a block of material is called a

Margarita [4]

A mass movement that involves the sudden movement of a block of material is called a B.slide.

♡♡Hope I helped!!! :)♡♡

7 0

3 years ago