Which of the following has unbalanced force? Someone help pls

When was the first airplane made?

expeople1 [14]

The first ariplanr was made December 17, 1903

3 0

3 years ago

Read 2 more answers

6) A stone is thrown vertically upward and returns to its starting position in o 5 s,What was its initial velocity?

NikAS [45]

25m/s if you are using -10 as gravity

3 0

2 years ago

A car is driving towards an intersection when the light turns red. The brakes apply a constant force of 1,398 newtons to bring t

dmitriy555 [2]

Answer:

the initial velocity of the car is 12.04 m/s

Explanation:

Given;

force applied by the break, f = 1,398 N

distance moved by the car before stopping, d = 25 m

weight of the car, W = 4,729 N

The mass of the car is calculated as;

W = mg

m = W/g

m = (4,729) / (9.81)

m = 482.06 kg

The deceleration of the car when the force was applied;

-F = ma

a = -F/m

a = -1,398 / 482.06

a = -2.9 m/s²

The initial velocity of the car is calculated as;

v² = u² + 2ad

where;

v is the final velocity of the car at the point it stops = 0

u is the initial velocity of the car before the break was applied

0 = u² + 2(-a)d

0 = u² - 2ad

u² = 2ad

u = √2ad

u = √(2 x 2.9 x 25)

u =√(145)

u = 12.04 m/s

Therefore, the initial velocity of the car is 12.04 m/s

7 0

2 years ago

Through what potential difference must electrons be accelerated so that they will exhibit wave nature in passing through a pinho

Mila [183]

Answer:

0.15 mV

Explanation:

In order to exhibit wave nature, the de Broglie wavelength of the electron must be of the same size of the diameter of the pinhole, therefore:

$\lambda=0.10 \mu m = 1.0\cdot 10^{-7} m$

The de Broglie wavelength of an electron is

$\lambda = \frac{h}{mv}$

where

$h=6.63\cdot 10^{-34} Js$ is the Planck constant

$m=9.11\cdot 10^{-31} kg$ is the mass of the electron

v is the electron's speed

Therefore, the electron's speed must be

$v=\frac{h}{m\lambda}=\frac{6.63\cdot 10^{-34}}{(9.11\cdot 10^{-31})(1.0\cdot 10^{-7})}=7278 m/s$

When accelerated through a potential difference $\Delta V$ , the kinetic energy gained by the electron is equal to the change in electric potential energy, therefore

$e\Delta V = \frac{1}{2}mv^2$

where

$e=1.6\cdot 10^{-19}$ is the magnitude of the charge of the electron

So, we can find the potential difference needed:

$\Delta V=\frac{mv^2}{2e}=\frac{(9.11\cdot 10^{-31})(7278)^2}{2(1.6\cdot 10^{-19})}=1.5\cdot 10^{-4}V = 0.15 mV$

5 0

3 years ago

U=10m/s<br> V=40m/s<br> g=10m/s²<br> Find time taken to reach theground

iogann1982 [59]

Let me Check but for now lets sing a song about physics

Explanation:

Welcome to science wars

Chemistry

Bio

Physics

Mathematical

Which field is best?

I understand the force and energy

Quantum mechanics and relativity

My field is pure and they rely on me

I see the universe like nobody

You may have made fun of me in high school

For being awkward and following the rules

Now I've got lasers

(Wow that's really cool)

May the mass times acceleration be with you

Atoms!

Entropy!

Dark matter!

String theory!

If you want to feel a bond

Then I can give you a good reaction

The elements that make up life are my essence

Are my satisfaction

All the other fields out there are so basic

Yeah, I'm the central science

Keep your i-on me I'll get you charged

If you need me, call me up on Avogadro's number

If you leave me, take a titrant

Shove it up your acid buffer

Dopamine and serotonin will keep you good and happy

Just get your flask and your glass all set up

And begin to understand the world

Within me you'll find life's beauty

From genetics to ecology

Symbiosis and not division

Unless it's mitosis or the study of fission

Even if you don't pass you'll enjoy my class

Evolution has brung us along

All species singing one song

If you want to learn about the world I must say

I am the purest field of study you can take

Immune to misinterpretation

The blueprint of creation

The backbone of all things science

No bias just constant augmentation

With your mind and observation

No gadgets just your logic and your time

And Pi!

Together we will find the answers to life

With Physics

Bio

Chemistry

And Math

We can science!

7 0

2 years ago