Answer:
Explanation:
Heat transfer occurs by three main mechanisms: conduction, where rigorously vibrating molecules transfer their energy to other molecules with lower energy; convection, in which the bulk movement of a fluid causes currents and eddies that promote mixing and the distribution of thermal energy
Why are scientists now more excited about sound levitation than they had been previously?
SELECT AN ANSWER
Sound levitation was previously only a theory and has only now been done experimentally.
By using sound levitation at the right frequency, scientists can break objects like glass.
The cost of sound levitation has decreased dramatically over the past decade.
Research has shown scientists can control the movement of liquids with sound without touching the liquid
Answer:
Acoustic tractor beams use the power of sound to hold particles in mid-air, and unlike magnetic levitation, they can grab most solids or liquids even small insects. For the first time engineers have shown it is possible to stably trap objects larger than the wavelength of sound in an acoustic tractor beam. This discovery could enable the manipulation of drug capsules or micro-surgical implements within the body. The discovery could even lead to levitating humans.
Explanation:
Except for helium, all the elements in the last column of the periodic table have
valence electrons.
0 7
0 8
О О
O 18
Answer:
O
Explanation:
they have O valence electrons
Pesticides are a type of wastewater
pollutant.
True
False
what frequency does television channel 7 broadcast at?
Answer:
Channel 7's frequency is 117.5 MHz
Answer:
174 MHz - 180 MHz w/ center frequency of 177 MHz
Explanation:
216 - 174 = 42
42/7 = 6
6 + 174 = 180 - 7 - 177 MHz
180 + 6 = 186 - 8 - 183 MHz
186 + 6 = 192 - 9 - 189 MHz
192 + 6 = 198 - 10 - 195 MHz
198 + 6 = 204 - 11 - 201 MHz
204 + 6 = 210 - 12 - 207 MHz
210 + 6 = 216 - 13 - 213 MHz
Calculate the wavelength of a photon of light having a frequency of 3.50 x 1015 Hz. A. 1.05 x 1024 m B. 1.33 x 1016 m C. 8.57 x 10-8m D. 1.17 x 107 m
Answer:
1.17x107m
Explanation:
A bucket is filled with pebbles and water. How can the contents of the bucket be classified?
A. A compound
B. A heterogeneous mixture
C. A solution
D. A homogeneous mixture
A 57.9 gram mass has a volume of 3 cm 3. What is the density of the mass?
Answer:
The answer is 19.3 g/cm³Explanation:
The density of a substance can be found by using the formula
[tex]density = \frac{mass}{volume}\\[/tex]
From the question
mass = 57.9 g
volume = 3 cm³
We have
[tex]density = \frac{57.9}{3} \\ [/tex]
We have the final answer as
19.3 g/cm³Hope this helps you
If 96.5 grams of gold has a volume of 5 cm, what is the density of gold?
What particle is in the nucleus that gives it a positive charge?
Answer:
proton
Explanation:
"Proton: A positively charged particle found in the nucleus of an atom. A proton contributes one atomic mass unit to the total atomic weight of an atom" this is definition per Google search
Think about atoms, molecules, elements, and compounds. How can you relate it to your own body? To the world around you, right now? Please explain in four sentences.
Answer:
Everything we see comes from the transferring of electrons, or redox reactions. Fire, the screen you are staring at, and many other chemical reactions that happen everyday, we don't even care to notice anymore. Everything in our bodies is made up of compounds, from simple things such as H2O, and to the food we eat, loaded with sugar, C12H22O11. From the para-benzoic acid on your sunscreen, to the O3 in the ozone layer high above us.
Explanation:
Compounds are different than elements because compounds are–
Group of answer choices
a pure substance; elements are not.
not able to be broken down into parts.
made from the same type of atoms.
combinations of two or more elements.
Answer: Compound are different than elements because compounds are combinations of 2 or more elements.
The amount of gravitational force between objects depends on their...
O Masses and the distance between them
O Masses and the frictional forces between them
O Speed and direction of motion
O Speed and the distance between the masses
Answer:
mass and distance between them
what is the volume when the density is 7.83g/ml and 19.6 grams?
The atomic mass of Gallium is 69.72 AMU. The masses of the naturally occurring isotopes are 68.9257 AMU and 70.908 AMU for Ga-69 and Ga-71. Find the percent (%) abundance for each.
Answer:
40.7% abundance of Ga-71
59.93% abundance of Ga-69
Explanation:
Given data:
Average atomic mass of Ga = 69.72 amu
Atomic mass of Ga-69 = 68.9257 amu
Atomic mass of Ga-71 = 70.908 amu
Percent abundance of each isotope = ?
Solution;
we know there are two naturally occurring isotopes of Ga.
First of all we will set the fraction for both isotopes
X for the isotopes having mass 68.9257
1-x for isotopes having mass 70.908
we will use the following equation,
68.9257x + 70.908 (1-x) = 69.72
68.9257x +70.908 - 70.908x = 69.72
68.9257x - 70.908x = 69.72 - 70.908
-1.9823x = - 1.188
x= 1.188/1.9823
x= 0.5993
0.5993 × 100 = 59.93 %
59.93 % is abundance of Ga-69 because we solve the fraction x.
now we will calculate the abundance of Ga-71.
(1-x)
1 - 0.5993 = 0.4007
0.4007× 100= 40.7 %
40.7 % for Ga-71.
How many electrons does chlorine need to obtain a full outer energy level of electrons? A) 1 B) 2 C) 3 D) 4
You just need one to reach full energy. (A)
Only one electrons does chlorine need to obtain a full outer energy level of electrons. Thus, option A is correct.
What is an electron?An electron is defined as a subatomic particle which is charged negatively either bounded to an atom or not it means free. The nucleus of an atom is made up of electron, proton and neutron. The electron is a basic particle and electron is not made of anything.
The nature of electron is free it means they are present freely in nature and consist of an atom.The main function of electron is that they play the role of negatively- charged component of an atom.
The electrons are primary source of current conducting and electrons number as well as atomic number of an element is always same or equal. There is no size of electron but the mass of electron is 9×10^-31.
Learn more about electron here:
https://brainly.com/question/1255220
#SPJ6
what two elements make up the most of the earth's core
Answer:
The Earth's core is mainly made of iron and nickel.
Explanation:
Answer: The Earth's core is mainly made of iron and nickel.
Explanation:
The density of a gas is 0.68 g/mL. What amount of space would 23.8 g of this gas occupy
what will happen to the speed of sound if you sing your favorite song during a cold day?
Answer:
The speed will decreasewhat type of compound is iron (3) oxide
Answer:
B Group Salt (Ionic Bond)
Explanation:
Iron (III) Oxide
Fe2O3
Answer:
Carbon Trioxide
Explanation:
According to the rock cycle, which of the following transitions are possible? Assume an unlimited number of steps.
A. )An intrusive igneous rock becomes a sedimentary rock.
B. )A sedimentary rock becomes soil.
C. )A metamorphic rock becomes an extrusive igneous rock.
D. )All of the above are possible.
Answer:
The answer is D
Explanation:
All of these solutions are correct.
Answer:
d
Explanation:
edge
If a 2 kg object produces a 16 N force, what is its acceleration?
Answer:
f=ma
so a=f/m
a=16N/2kg
a=8m/[tex]s^{2}[/tex]
How many elements are in the following equation? salt pure water(NaC/
+ H2O)
Answer:
4
Explanation:
Sodium Na, Carbon C, hydrogen H2, Oxygen O
How would you record the length of an object?
Answer:
a ruler
Explanation:
Elements that are good conductors, malleable, ductile, and shiny
ductility
malleability
metal
metalloid
nonmetal
Metals are ductile,malleable,good conductors and shiny
Forensic psychiatry focuses on the relationship between human behavior and criminal justice.
O True
O False
A mass spectrometer has determined the mass and abundances of all isotopes of an unknown element. The first isotope has a mass of 38.96amu (93.28%) and the second a mass of 40.96amu (6.72%). Calculate the average atomic mass and identify the unknown element, WRITE ONLY THE SYMBOL FOR YOUR ANSWER.
Answer:
I believe it is Potassium (K)
Explanation:
I did the math on a calculator and it was the closest atomic mass to potassium.
What is the purpose of this material in the nucleus?*
O
makes antibodies
DNA makes protein molecules to help with almost every cellular process.
о
DNA makes super molecules to help with almost every cellular process.
to make concrete
Answer: DNA makes protein molecules to help with almost every cellular process.
i think?
Which of these particles is the smallest?
A.a proton
B.a nucleus
C.an electron
D.an atom
Answer:
an atom. It is the smallest thing known to man kind
Explanation:
Answer:
C
Explanation:
so basically, we can eliminate some answer choices right away.
an atom (answer choice D) is made up of all the other answer choices, so that is the largest (not the answer).
a nucleus (answer choice B) is made up of protons (answer choice A) and neutrons which means it is not the smallest either (not the answer).
now, we are left with a proton and an electron. electrons are much smaller than protons, so they are usually not included in an element's atomic mass. therefore, an electron is the smallest out of these answer choices.
5) How do you describe a person who likes
inventing stories?
Plz Help ;_; :v
Answer:
One word for this is, raconteur - it means a person skilled in telling anecdotes. anecdotist. narrator, or storyteller
Explanation:
When hit from behind in a car crash, a passenger can suffer a
neck injury of whiplash. This is an example of Newton's
law,
Answer:
Neck injury, and back injury