Does electric and magnetic objects both have north and south poles

torisob [31]

<u>Answer:</u>

The modern atomic theory has given by "John Dalton and framed postulates".

<u>Explanation:</u>

The fundamental role of atoms in chemistry is established by the modern theory of atoms mentioned in 1808 for the first time by an English scientist named John Dalton. This consists of three sections such as all matter is composed of atoms, atoms of the same element are the same while atoms of different elements are different, atoms combine to form compounds in full-number ratios.

The unique characteristic of the "number of protons" is that all atoms of the same compound share. While the atoms of the same element i.e having a similar number of protons can have different numbers of neutrons and such elements are called isotopes.

5 0

3 years ago

A car accelerates from rest to a speed 20 m/s in 12 s. Find the distance the car travels this time

Andrew [12]

The first thing we need to do is figure out what equation to use. We will use the following kinematic equation...

Δx = (final velocity + initial velocity) x time / 2

We know that the car accelerates from rest, so initial velocity = 0 m/s
We also know final velocity = 20 m/s and time = 12s

Now we just need to plug everything in.

Δx = (20 x 12)/2 = 120 meters

6 0

2 years ago

A fire hose sends 2429 gallons of water per minute against a burning building. The water strikes the building at 66 m/s and does

Anastasy [175]

Answer:

a) Δp = - 10113.2 Kg m / s, b) he rate of change is negative, c) F = 140.46N

Explanation:

a) For this part let's analyze a water particle, it has a velocity of 66 m / s and when it collides with the building its velocity changes to zero, so the change in moment is

Δp = mv_f - m v₀

Δp = -m v₀ (1)

the change of the moment in a second is

if 2429 gallons arrive in in minute (60s) in a second how many gallons arrive

c_agua = 2429/60

c_water = 40,483 gallon/ s

let's use the concept of density to find the mass

ρ = m / V

m = ρ V

let's reduce gallons to liters

c_water = 40,483 gal (3,785 l / 1 gal) = 153.23 l

m = 1 153.23

m 153.23 kg

we substitute in 1

Δp = - 153.23 66

Δp = - 10113.2 Kg m / s

b) From the previous result the rate of change is negative

c) Let's use the impulse ratio

I = f t = Δp

F t = Δp

F = Δp / t

F = $\frac{10113.2}{1.2 \ 60}$

F = 140.46 N

5 0

2 years ago

I cant figure this out for so long. thank you in advance whoever helps me

kvasek [131]

Answer:

a magnet is a material with a North and South pole

8 0

2 years ago

The voltage across a membrane forming a cell wall is 74.0 mV and the membrane is 8.40 nm thick. What is the electric field stren

Readme [11.4K]

Answer:

Electric field strength=8.81×10⁶V/m

Explanation:

Given Data

voltage v= 74.0 mV

Membrane thickness d=8.40 nm

To find

Electric field strength E=?

Solution

Electric field strength =voltage/Membrane thickness

$E=v/d\\E=\frac{74.0*10^{-3} }{8.40*10^{-9} }\\ E=8.81*10^{6}V/m$

8 0

3 years ago