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4 years ago

An example of a characteristic property of a mineral is

Physics

1 answer:

rodikova [14]4 years ago

4 0

I will give you more than one , hardness,luster,color,streak,cleavage,fracture.

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How can an electron in an atom lose energy to go from a higher energy level to a lower energy level? select one:

Romashka-Z-Leto [24]

I belive that the answer is b.

8 0

3 years ago

Find the circumference of a circle whose area is 452.16 square meters. (Use 3.1416 as the value of .)

kakasveta [241]

1) The area of a circle is given by

$A=\pi r^2$

where r is the radius of the circle. In this problem, we are told that the area is

$A=452.16 m^2$

so we can rearrange the previous equation to calculate the radius:

$r=\sqrt{\frac{A}{\pi}}=\sqrt{\frac{452.16 m^2}{3.1416}}=12.0 m$

And now we can find the circumference, by using the formula:

$c=2 \pi r=2 \pi (12.0 m)=75.3984 m$

Therefore, the correct answer is D. 75.3984 meters.

2) The volume of a cube is given by:

$V=L^3$

where L is the length of the edge. In this problem, L=6 cm, therefore the volume of the cube is

$V=L^3=(6 cm)^3=216 cm^3$

and so, the correct answer is A. 216 cu. cm.

5 0

4 years ago

2. Explain the mechanism by which AC (alternating current) through the primary circuit of a transformer produces an alternating

atroni [7]

Explanation:

A transformer consists of core of soft iron (a material that can be easily magnetized/demagnetized), to which two coils are attached at both ends.

An alternating current in the primary coil produces a magnetic field around the coil, magnetizing the iron core; therefore, the same magnetic field produces a magnetic flux in the secondary coil.

Since the AC current in the primary coil is variable, then the magnetic field also changes, so the magnetic flux through the secondary coil changes over time; therefore, an electromotive force (and so, a current) is induced in the secondary coil, according to Faraday-Newmann-Lenz:

$\epsilon= - \frac{d\Phi}{dt}$

where

$\epsilon$ is the induced emf

$\frac{d\Phi}{dt}$ is the rate of change of magnetic flux through the secondary coil

We notice that this mechanism would not work if the current in the primary coil is a DC current: in fact, a DC current has always a constant value, so there is no change in the magnetic field, therefore no change in the magnetic flux through the secondary coil and no emf induced.

6 0

3 years ago

a very thin layer of gold plating was placed on a metal tray that measures 25.22 cm by 13.22cm. The gold plating increased the m

marshall27 [118]

<span>As the volume of gold is

Volume = mass/ density

V = </span>0.0512g / 19.31gcm^−3
=0.0026

Volume of gold = L. W. T
0.0026 = 52.22 * 13.22 * T
Thickness T = 0.0026 / 690.43

T= 3.7 * 10^-6

5 0

4 years ago

What type of magnetism is present in a bar magnet?

skelet666 [1.2K]

Answer:

It is made up of iron, steel or any other ferromagnetic substance or ferromagnetic composite, having permanent magnetic properties. The magnet has two poles: a north and a south pole. When you suspend it freely, the magnet aligns itself so that the north pole points towards the magnetic north pole of the earth.

6 0

3 years ago

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