All categories

3 years ago

Rough Surface with: Ms = 0.8 HK = 0.4

Physics

1 answer:

vlabodo [156]3 years ago

3 0

Answer:

a) F = 18.375N, b) F = 24.5 N

Explanation:

This exercise can be solved using the translational equilibrium equations.

Let's start by fixing a reference system with the horizontal x axis and the vertical y axis, from the statement of the exercise I understand that the wall is vertical and the book is supported on it, therefore the applied force is in the direction towards the wall

a) In this part the force that does not allow the movement of the book is requested, therefore the static friction coefficient must be used (μ_s = 0.8)

X axis

F - N = 0

N = F

Y axis

fr - W = 0

W = fr

where W is the weight of the book.

The friction force has the formula

fr = μ_s N

we substitute

mg = μ_s F

F = $\frac{mg}{\mu_s }$

let's calculate

F = 1.5 9.8 / 0.8

F = 18.375N

b) In this case the book is moving so the friction coefficient to use is kinetic ( μ_K = 0.6)

F = $\frac{mg}{\mu_K }$

we calculate

F = 1.5 9.8 / 0.6

F = 24.5 N

You might be interested in

The ability to navigate, hunt, and communicate by electric current in water most likely helps make up for the effect of dark, mu

fgiga [73]

The ability to navigate, hunt, and communicate by electric current in water most likely helps make up for the effect of vision. The answer to your question is VISION.

If fish live in a dark, murky water, that means that their sense of vision is affected. In dark, murky water they could not see anything. So, fish that lives in this kind of water developed the ability to o navigate, hunt, and communicate by electric current in water. This ability is known as electroreception. Among fish, electroreception is present in some sharks and rays, and electric eels.

I hope that this is the answer that you were looking for and it has helped you.

6 0

4 years ago

A meteor is

Leya [2.2K]

Answer:

A meteor is B) an icy body with a long tail extending from it.

Explanation:

Meteors are very small dust particles that, when penetrating into the Earth's atmosphere, burn quickly by rubbing with the gases of the same. Some meteors, those with larger dimensions and appreciable weights, are brighter and can describe longer trajectories, showing longer.

In other words, the meteoroids, celestial bodies can vary in size between 100 micrometers up to 50 meters, they collide with the atmosphere of our planet and if the particles are of a small size, upon impact they enter combustion creating a flash, is what we know as meteor or shooting star. Therefore, the meteor is a luminous phenomenon that leaves behind a persistent trail.

So, a meteor is B) an icy body with a long tail extending from it.

4 0

3 years ago

Water floats on a liquid called "carbon tetrachloride." The two liquids do not mix. A light ray passing from water into carbon t

Oduvanchick [21]

Answer:

1.26

Explanation:

$index \: of \: refraction \: = \: \ \frac{ \sin(angle \: of \: incidence) }{ \sin(angle \: of \: refraction) }$