Which statement accurately describes quantum mechanics and nanotechnology?

A mixture consists of sand, salt, and iron filings. Which of the following instruments or materials would not be useful in separ

Zanzabum

Well water would prob be your best bet, you could extract the salt first and then use a magnet to seperate the iron filing from the sand

5 0

4 years ago

A 4kg block slides freely across a rough surface such that the block slows down with an acceleration of −1.25 m/s2 . What is the

Sophie [7]

Answer:

The coefficient of kinetic friction between the block and the surface is 0.127.

Explanation:

Given that,

The mass of a block, m = 4 kg

The acceleration of the block, a = -1.25 m/s²

We need to find the coefficient of kinetic friction between the block and the surface. The force of friction is given by :

$F=\mu mg\\\\ma=\mu mg\\\\\mu=\dfrac{a}{g}\\\\\mu=\dfrac{1.25}{9.8}\\\\\mu=0.127$

So, the coefficient of kinetic friction between the block and the surface is 0.127.

6 0

3 years ago

What exerts a centripetal force on a person running around a curve?

Eduardwww [97]

Answer:

The inertial force of the body

Explanation:

Everybody that is moving in a curved path has an inertial force called centrifugal force.

The counterforce of the centrifugal force is called the centripetal force. It also acts on every rotating body.

This force is always directed towards the center of the origin of the curve.

The velocity of the object changes its direction and magnitude at any instant of time. But the speed and angular velocity of the object remains the same for uniform circular motion.

So, according to the Newtonian mechanics, it is the inertial force of the body responsible for the centripetal force.

5 0

3 years ago

draw a labelled ray diagram to locate the image of an object formed by a convex lens of focal length 20cm when the object is pla

azamat

<h3><u>Answer</u> :</h3>

<u>Focal length of convex lens is taken positive.</u>

$:\implies\sf\:\dfrac{1}{v}-\dfrac{1}{u}=\dfrac{1}{f}$

$:\implies\sf\:\dfrac{1}{v}-\dfrac{1}{(-30)}=\dfrac{1}{20}$

$:\implies\sf\:\dfrac{1}{v}=\dfrac{1}{20}-\dfrac{1}{30}$

$:\implies\sf\:\dfrac{1}{v}=\dfrac{3-2}{60}$

$:\implies\:\boxed{\bf{\gray{v=60\:cm}}}$

7 0

3 years ago

Which is a characteristic of projectile motion?

SVETLANKA909090 [29]

<h2>Right answer: It follows a curved path </h2>

The movement of a projectile is a movement in two dimensions (forming a curved path: a parabola shape) with <u>constant acceleration. </u>

A projectile is any body or object that is thrown or projected by means of some force and continues in motion by its own inertia. This means the only force that acts on it while in motion is <u>the acceleration of gravity</u> (in this case we are on Earth, so the gravity value is $9.8\frac{m}{s^{2}}$ ).

Where gravity influences the <u>vertical movement</u> of the projectile, while <u>the horizontal movement</u> of the projectile is the result of the tendency of any object to remain in motion at a constant speed (according to Newton's 1st law of motion sometimes called Law of Inertia).

The other options are <u>incorrect</u> because are <u>false</u>:

-The forward motion negates air resistance: There is always at least a small percent of air resistance, as long as that movement is done on Earth.

-It has variable acceleration: In projectile motion acceleration is constant (gravity acceleration) .

-It is unaffected by gravity: The only force that acts on the projectile is due gravity.

5 0

3 years ago

Read 2 more answers