All categories

3 years ago

Hiii please help i’ll give brainliest if you give a correct answer please thanks!

Physics

2 answers:

lakkis [162]3 years ago

8 0

Answer: the first one

Explanation: good luck!

Alinara [238K]3 years ago

6 0

Answer:

<h3>Friction </h3>

Explanation:

Friction is a force that resists motion between surfaces that are in contact.

<h3>l hope it helps ❣❣</h3>

You might be interested in

How does stuff fall?

drek231 [11]

Answer:

Gravity is the force that allows for all objects to fall.

4 0

3 years ago

A 40kg mass is pulled by a horizontal force of 200N, with a constant velocity. What is h^2?

Sladkaya [172]

Answer:

40,000

Explanation:

200x 200=40000

I'm pretty sure that's the answer

6 0

3 years ago

Answer the following questions regarding the equation:

scoundrel [369]

Explanation:

1) This is a synthesis reaction (two or more reactants combine to form a single product).

2) The coefficients are added to balance the reaction.

3) Adding the states of matter (solid, liquid, gas) will make the reaction more precise.

5 0

4 years ago

Chapter 38, Problem 001

Norma-Jean [14]

Answer:

a) $\lambda=2.95x10^{-6}m$

b) infrared region

Explanation:

Photon energy is the "energy carried by a single photon. This amount of energy is directly proportional to the photon's electromagnetic frequency and is inversely proportional to the wavelength. If we have higher the photon's frequency then we have higher its energy. Equivalently, with longer the photon's wavelength, we have lower energy".

Part a

Is provide that the smallest amount of energy that is needed to dissociate a molecule of a material on this case 0.42eV. We know that the energy of the photon is equal to:

$E=hf$

Where h is the Planck's Constant. By the other hand the know that $c=f\lambda$ and if we solve for f we have:

$f=\frac{c}{\lambda}$

If we replace the last equation into the E formula we got:

$E=h\frac{c}{\lambda}$

And if we solve for $\lambda$ we got:

$\lambda =\frac{hc}{E}$

Using the value of the constant $h=4.136x10^{-15} eVs$ we have this:

$\lambda=\frac{4.136x10^{15}eVs (3x10^8 \frac{m}{s})}{0.42eV}=2.95x10^{-6}m$

$\lambda=2.95x10^{-6}m$

Part b

If we see the figure attached, with the red arrow, the value for the wavelenght obtained from part a) is on the infrared region, since is in the order of $10^{-6}m$

4 0

3 years ago

Aluminum and copper are good ____ because they don't have a strong hold on valence electrons. * a. Insulators b. Transistors c.

SOVA2 [1]

aluminum and copper are C.) conductors

6 0

3 years ago