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Leya [2.2K]
3 years ago
5

How can you tell if a diamond real or fake

Physics
2 answers:
rewona [7]3 years ago
8 0
Scratch it on a peice of glass
notsponge [240]3 years ago
6 0
You can tell if a diamond is real or fake by checking its edges. Real diamonds have sharp edges, while fake ones don't. Another way is to bring it to a jewelry shop, or have a professional look at it, which is the best and easiest way. You can also see if a diamond is real or not by placing it on top of a newspaper, and to see if you can read the text through the diamond. If you can, then it is a fake, because real diamonds contort light, making the letters of the newspaper blurry.

~Hope I helped!~
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a car is moving with a constant speed of 20 meters per second.What total distance does the car travel in 2 minutes
N76 [4]
There are 120 seconds in two minutes, so to find the answer, you multiply 20 x 120 to get 2400 meters.
8 0
3 years ago
1. Which will speed up the rate of a chemical
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2 years ago
A star with the mass (M=2.0×1030kg) and size (R=3.5×108m) of our sun rotates once every 30.0 days. After undergoing gravitationa
Gre4nikov [31]

Answer:

r=97.22x10^{3} m

Explanation:

Using the angular formulas can determine the radius using both values neutron star and the the knowing star so

L=I*w

L_{1}=I_{1}*w_{1}=L_{2}=I_{2}*w_{2}

I_{1}*w_{1}=I_{2}*w_{2}

I=Inertia of the star

w=angular velocity

I=\frac{2*m*r^{2}}{5}

w=\frac{2\pi}{t}

Notice the angular velocity determinate by the time and the Inertia have the radius value so

\frac{2}{5}*m*r_{sn}^{2}*\frac{2\pi }{t_{1}}=\frac{2}{5}*m*r_{s}^{2}*\frac{2\pi }{t_{2}}

r_{sn}^{2}*\frac{1}{t_{1}}=r_{s}^{2}*\frac{1}{t_{2}}

r_{sn}^{2}=r_{s}^{2}*\frac{t_{1}}{t_{2}}

t_{1}=0.2s\\t_{2}=30day*\frac{24hr}{1day}*\frac{60minute}{1hr}*\frac{60seg}{1minute}=2.592x10^{6}s

r_{sn}=3.5x10^{8}m*\sqrt{\frac{0.2s}{2.592x^{6}s}}

r_{sn}=97.22x10^{3} m

8 0
2 years ago
6. Thorium-234 decays by giving off one particle, and the decay can be represented by the following nuclear equation:
Nady [450]

<span><span>23892</span>U→<span>l<span>23490</span></span>Th<span>+<span>42</span></span>He</span>

Explanation:

Uranium-238 produces thorium-234 by alpha decay.

An α-particle is a helium nucleus. It contains 2 protons and 2 neutrons, for a mass number of 4.

During α-decay, an atomic nucleus emits an alpha particle. It transforms (or decays) into an atom with an atomic number 2 less and a mass number 4 less.

Thus, uranium-238 decays through α-particle emission to form thorium-234 according to the equation:

<span><span>23892</span>U→<span>l<span>23490</span></span>Th<span>+<span>42</span></span>He</span>

Note that the sum of the subscripts (atomic numbers or charges) is the same on each side of the equation.

Also, the sum of the superscripts (masses) is the same on each side of the equation.

8 0
3 years ago
Which waves are mechanical waves?
dezoksy [38]
<span>sound waves is an example of mechanical waves</span>
5 0
3 years ago
Read 2 more answers
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