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Kitty [74]
3 years ago
7

What scientific principle causes the different layers of the earth

Physics
1 answer:
Vedmedyk [2.9K]3 years ago
5 0

Answer: The stratification of earth into its geologic layers was brought about by th e formation of the earth iron core.

Explanation:

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If a population of 1,000 individuals has 160 rr genotypes, what is the frequency of the rr genotype?
lesya692 [45]
The frequency of a genotype is how often it occurs. This can be obtained by:
number of occurrences / total population
= 160 / 1000
= 0.16 or 16%
7 0
3 years ago
What is a single cell organism able to do?
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Survived on its own.
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How much work will be done on a 30kg object traveling at 20 m/s from the rest?
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3 years ago
Calculate the highest frequency X-rays produced by 8.00 · 104 eV electrons. _____ Hz
lys-0071 [83]
When an electron stops, it emits a photon with energy equal to the kinetic energy lost by the electron:
E=\Delta K
The energy of the photon is E=hf where h=6.63 \cdot 10^{-34} Js is the Planck constant and f is the frequency. Therefore, the maximum frequency of the emitted photon occurs when the loss of kinetic energy is maximum.

The maximum loss of kinetic energy of the electron occurs when the electron stops completely, so it loses all its energy:
\Delta K = 8\cdot 10^4 eV
Keeping in mind that 1 eV=1.6 \cdot 10^{-19}J, we have
\Delta K = 8 \cdot 10^4 eV \cdot 1.6 \cdot 10^{-19}J/eV = 1.28 \cdot 10^{-14}J

And so, this corresponds to the energy of the emitted photon, E. Therefore, we can find the maximum frequency of the emitted photon:
f= \frac{E}{h} = \frac{1.28 \cdot 10^{-14}J}{6.63 \cdot 10^{-34}Js}=1.93 \cdot 10^{19}Hz
5 0
3 years ago
A piano string having a mass per unit length equal to 4.80 x10^-3 kg/m is under a tension of 1200 N. Find the speed with which a
Travka [436]

Answer:

500m/s

Explanation:

From the question we are given the following;

mass per unit length = 4.80 x10^-3 kg/m

Tension T = 1200N

Speed of the wave is expressed as;

v = √T/m

v = √1200/0.0048

v = √250,000

v = 500m/s

Hence the speed at which the wave travels on this string is 500m/s

3 0
3 years ago
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