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4 years ago

A magnet no matter how big or small will always have______.

Physics

2 answers:

BartSMP [9]4 years ago

6 0

Answer: A north pole and a south pole

Explanation: All magnets no matter how big or small they are will always have poles. All magnets have two regions of magnetic strength where they are the strongest. Even if I cut a magnet in half, it would still have poles.

It's important to understand that there like poles repel each other and opposites attract.

koban [17]4 years ago

4 0

Answer:

Two poles

Explanation:

a magnet no matter how big or small will always have two poles i.e. north pole and south pole.

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In Europe the standard voltage in homes is 220 V instead of the 120 V used in the United States. Therefore "100-W" European bulb

Maslowich

Explanation:

In Europe the standard voltage in homes is 220 V instead of the 120 V used in the United States.

100-W European bulb would be intended for use with a 220-V potential difference.

(a) If V = 220 V and P = 100 W

Power :

$P=\dfrac{V^2}{R}\\\\R=\dfrac{V^2}{P}\\\\R=\dfrac{(220)^2}{100}\\\\R=484\ \Omega$

If you bring a "100-W" European bulb home to the untied States, what should be its US power rating. So,

$P=\dfrac{V^2}{R}\\\\P=\dfrac{(120)^2}{484}\\\\P=29.75\ W$

P = 29.8 watts

(b) Let I is the current will the 100-W European bulb draw in normal use in the United States. So,

$I=\dfrac{V}{R}\\\\I=\dfrac{120}{484}\\\\I=0.248\ A$

Hence, this is the required solution.

3 0

3 years ago

Read 2 more answers

When an electric current is passed through water during the process of electrolysis, two gases are formed. One gas has a boiling

konstantin123 [22]

The chemical change occurred. Electrolysis is used by scientists to make chemical reactions that wouldnt normaly spontaniously ocur. In this case we are getting new gases from water molecul which is change in structure of elements ( we are getting new moleculs)

7 0

3 years ago

Wagon wheel. While working on your latest novel about settlers crossing the Great Plains in a wagon train, you get into an argum

OverLord2011 [107]

Answer:

I = 16.7kgm²

Explanation:

Since, Torque is given by,

\tau = F*r = I*\alpha

here, I = Moment of inertia = ??

\alpha = angular acceleration of wheel = a/r

F = tangential tension acting on the wheel = T

a = acceleration of bag of sand = 2.95 m/s^2

r = radius of wheel = d/2 = 120/2 = 60 cm = 0.60 m

from force balance on sand bag,

mg - T = m*a

T = m*(g-a)

m = mass of sand bag = 20 kg

So, I = T*r/\alpha = m*(g-a)*r/(a/r)

Using known values:

I = 20*(9.81 - 2.95)*0.60/(2.95/0.60) = 16.74

I = 16.7 kgm² = Moment of inertia of wheel experimentally

also, Moment of inertia of wheel theoretically(I') = M*r²

given, M = mass of wheel = 70 kg

I' = 70*0.60²= 25.2 kgm² = Moment of inertia of wheel theoretically

7 0

3 years ago

Describe what happens when a plate carrying oceanic crust collides with a plate carrying continental crust.

pav-90 [236]

Answer:

Subduction occurs and a trench is formed.

Explanation:

When a tectonic plate carrying an oceanic crust collides with a tectonic plate carrying a continental crust then the oceanic plate will slide beneath the continental one, forming a trench.

This is possible because the oceanic crust is less dense than the continental crust.

Subduction is a geological phenomenon in which the tectonic plates of one crustal plate descends below the edge of the other. The region where this happens is called a subduction zone.

3 0

3 years ago

1.What is the kinetic energy of an object with a velocity of 7m / s and a mass of 14kg

Vlada [557]

Answer:

Explanation:

The formula for KE is

$KE=\frac{1}{2}mv^2$ and we fill in to solve for KE:

$KE=\frac{1}{2}(14)(7.0)^2$ I used 2 significant digits in the velocity because 1 isn't accurate enough. Therefore, my answer will be rounded to 2 sig fig's:

KE = 340 J (rounded from 343). And we do the exact same thing in #2:

$KE=\frac{1}{2}(5.0)(5.0)^2$ (Used 2sig fig's for both the mass and the velocity) to get

KE = 63 J (rounded from 62.5)

3 0

3 years ago

A magnet no matter how big or small will always have______.​

A magnet no matter how big or small will always have______.