Given,
Mass of a rifle = 5.5 kg
Mass of a bullet = 11 g
Speed of a bullet = 1000 m/s
To find,
(a) The recoil velocity of the rifle.
(b) If the shooter holds the rifle firmly against his shoulder, What will be the recoil velocity.
Solution,
(a) Let v₁ is the recoil velocity of the rifle. We can use the conservation of momentum to find it. The momentum of the system will remains conserved.
[tex]m_1v_1=m_2v_2\\\\v_1=\dfrac{m_2v_2}{m_1}\\\\v_1=\dfrac{0.011\times 1000}{5.5}\\\\v_1=2\ m/s[/tex]
So, the recoil velocity of the rifle is 2 m/s and it is in opposite direction of he bullet.
(b) Let V is the recoil velocity if the shooter holds the rifle firmly against his shoulder. Again using the conservation of momentum.
[tex]V=\dfrac{0.011\times 1000}{120}\\\\v=0.091\ m/s[/tex]
Therefore, this is the required solution.
How many particles are in 3.2 mole of neon gas
There are 1.93 x 10²⁴ particles
Further explanationGiven
3.2 moles of Neon gas
Required
Number of particles
Solution
The mole is the number of particles(molecules, atoms, ions) contained in a substance
1 mol = 6.02.10²³ particles
Can be formulated
N=n x No
N = number of particles
n = mol
No = Avogadro's = 6.02.10²³
So the number of particles for 3.2 moles :
N = 3.2 x 6.02.10²³
N = 1.93 x 10²⁴
or
we can describe it using Avogadro's number conversion factor
[tex]\tt 3.2~moles\times \dfrac{6.02\times 10^{23}}{1~mole}=1.93\times 10^{24}[/tex]
What does the GOES acronym stand for?
A. Geological Open Engineering System
B. Geostationary Opertational Environmental Satellite
C. Grandma Only Eats Spagetti
Answer:
B. Geostationary Operational Environmental Satellite
Explanation:
Hope this helps!
Answer:
B
Explanation:
I’m studying it for you!
The radius of a basketball hoop is 9 inches. Which expression can be used to find the
hoop's circumference in inches?
Answer:
2 [tex]\pi[/tex] r
Explanation:
Given that:
Radius of basketball = 9inches
Unknown:
Hoop's circumference = ?
Solution:
To solve this problem, we use the formula for the circumference of a circle.
The shape of the hoops is circular.
Circumference of a circle = 2 [tex]\pi[/tex] r
R is the radius of the basketball hoop
What is in the solar system?
A. All the above
B. asteroids and comets
C. The sun and everything thing that orbits around it
D. planets and their moons
PLEASE HELP
Answer:
all of the above
Explanation:
all of this is in the solar system
Help me please O w O
Answer:
42 km/h
Explanation:
a. 24 m x 3.26 m
b. 120 m x 0.10 m
c. 1.23 m x 2.0 m
d. 53.0 m x 1.53 m
PLEASE SHOW WORK
round answers with correct significant figure.
Answer: a) [tex]78.2m^2[/tex]
b) [tex]1.2\times 10m^2[/tex]
c) [tex]2.5m^2[/tex]
d) [tex]81.1m^2[/tex]
Explanation:
Significant figures : The figures in a number which express the value -the magnitude of a quantity to a specific degree of accuracy is known as significant digits.
Rules for significant figures:
1. Digits from 1 to 9 are always significant and have infinite number of significant figures.
2. All non-zero numbers are always significant.
3. All zero’s between integers are always significant.
4. All zero’s preceding the first integers are never significant.
5. All zero’s after the decimal point are always significant.
The rule apply for the multiplication is :
The least number of significant figures in any number of the problem determines the number of significant figures in the answer.
a) [tex]24m\times 3.26m=78.2m^2[/tex]
b) [tex]120m\times 0.10m=1.2\times 10m^2[/tex]
c) [tex]1.23m\times 2.0m=2.5m^2[/tex]
d) [tex]53.0m\times 1.53m=81.1m^2[/tex]
A 15.33 g sample of magnesium oxide is found to contain 12.67 g of magnesium. What is the percent (by mass) composition of
the magnesium in the compound?
026 Ma
Answer:
Explanation:
I can help
Answer:
12.67g of Mg / 15.33g of MgO * 100% = 82.6% of Mg
Explanation:
3 reasons why aluminium is used in making of cooking vessels
Answer is : It is a good thermal and electrical conductor. -The main point to be noted is that aluminium is a highly reactive element and still it is used for making cooking utensils. The reason is that aluminium has a very high affinity for oxygen. So, it reacts with oxygen and forms a layer of aluminium oxide on its surface.
Answer:
This is because aluminium reacts with oxygen present in air to form a thin layer of aluminium oxide . This oxide layer is very stable and prevents further reaction of aluminium with oxygen . Also , it is light in weight and a good conductor of heat Hence , it is used to make cooking utensils .
Explanation:
Believe it
Choose the statement below that correctly describes electrons.
a. Electrons have a positive charge and are lighter than protons
b. Electrons have a positive charge and are heavier than protons
c. Electrons have a negative charge and are heavier than protons
d. Electrons have a negative charge and are lighter than protons
Answer:
d. Electrons have a negative charge and are lighter than protons
Explanation:
The best statement that describes electrons is that electrons are negatively charged and are lighter than protons.
There are three known subatomic particles which are:
Protons which are the positively charged particles within an atom. Electrons are the negatively charged particles Neutrons do not carry any charges.The mass of the protons and neutrons are similar.
Electrons are lighter than both protons and neutrons.
All atoms of oxygen have the same mass number. True or False
Answer:
pretty sure it's false
Explanation:
hope this helps!
6/14and3/7 answer 6/11and9/16answer 5:6=10:12answer
your question was incomplete.............. you haven't mentioned any required information
A hydrogen atom absorbs a photon radiation causing an electron to jump from level one to level two. If the photon/radiation has a wavelength of 5.62 x 10^-3 m to calculate the frequency of the radiation absorbed and the energy change of the electron
Answer:
1.
First of all, let's convert the energy of the absorbed photon into Joules:
The energy of the photon can be rewritten as:
where
h is the Planck constant
c is the speed of light
is the wavelength of the photon
Re-arranging the formula, we can solve to find the wavelength of the absorbed photon:
2. 1.24 eV
In this case, when the electron jumps from the n=4 level to the n=3 level, emits a photon with wavelength
So the energy of the emitted photon is given by the formula used previously:
and using
we find
converting into electronvolts,
Explanation:
An element is a specific type of atom (true or false)
Answer:
True
Explanation:
An element is pure substance that conatin only one type of atom
Answer:
true
Explanation:
the element hydrogen is made from atom
A gas at 76 K is under a pressure of 78.4 kPa. If the temperature changes to 105 what will be the new
pressure?
Answer:
108.3kPa
Explanation:
Given parameters:
Initial temperature = 76k
Initial pressure = 78.4kPa
Final temperature = 105k
Unknown:
Final or new pressure = ?
Solution:
To solve this problem, we apply the combined gas law:
[tex]\frac{P_{1} }{T_{1} }[/tex] = [tex]\frac{P_{2} }{T_{2} }[/tex]
T1 = 76k
P1 = 78.4kPa
T2 = 105k
[tex]\frac{78.4}{76}[/tex] = [tex]\frac{P_{2} }{105}[/tex]
P2 = 108.3atm
The Faruq family uses 548 liters of water per day.
The Chammas family uses 3 times as much water
per day.
Answer:
11508 liters
Explanation:
The Faruq family uses 548 liters of water per day. The Chammas family uses 3 times as much water per day. How much water does the Chammas family use per week?
Solution:
The amount of water used by the Chammas family is three times that of the Faruq family per day, hence:
Amount of water used by Chammas family in a day = 3 * water used by Faruq family in a day
Amount of water used by Chammas family in a day = 3 * 548 = 1644 liters
The amount of water used by the Chammas family in a week = 1644 liters per day * 7 days in a week = 11508 liters
Therefore 11508 liters of water was used by the Chammas family in a week
The way Earth's rotation makes winds curve.
Answer:
it is called the prevailing westerlies
Explanation:
how can balancing equations support the law of conservation
Answer:
detail is given below.
Explanation:
This law was given by French chemist Antoine Lavoisier in 1789. According to this law mass of reactant and mass of product must be equal, because masses are not created or destroyed in a chemical reaction.
Law of conservation of mass:
According to the law of conservation mass, mass can neither be created nor destroyed in a chemical equation.
For example:
In given photosynthesis reaction:
6CO₂ + 6H₂O → C₆H₁₂O₆ + 6O₂
The given equation is balanced chemical equation of photosynthesis. There are six carbon atoms, eighteen oxygen atoms and twelve hydrogen atoms on the both side of equation so this reaction followed the law of conservation of mass.
If equation is not balanced,
CO₂ + H₂O → C₆H₁₂O₆ + O₂
It can not follow the law of conservation of mass because mass is not equal on both side of equation.
An atom contains 8 protons, 8 neutrons and 8 electrons. A second atom contains
8 protons, 10 neutrons and 10 electrons. What can be said about these two
atoms?
A. Both atoms are neutral
B. The atoms are isotopes of each other
C. Both atoms are ions
D. These atoms cannot exist in nature
Answer:
B. Isotopes mean having differing number of neutrons but having the same amount of protons basically.
Explanation:
B. The atoms are isotopes of each other
Further explanationGiven
The first atom : 8 protons, 8 neutrons and 8 electrons
The second atom : 8 protons, 10 neutrons and 10 electrons
Required
Comparison
Solution
A. Atom is said to be neutral if the number of protons and electrons is the same
The first atom neutral
The second atom - anion : charge = -2(10 electron-8 proton)
B. isotopes = the same atomic number and different mass number
The first atom : atomic number = 8, mass number = 16
The second atom neutral : atomic number = 8, mass number = 18
Both : isotopes
C. First atom = neutral, second atom anion (charge = -2)
D. Can exist in nature
A piece of mental with a mass of 106 g is placed in a 50 mL graduated cylinder.The volume rises from 20 mL to 31 mL. What is the destiny of the metal?
Answer:
9.64g/mL
Explanation:
Given parameters:
Mass of the metal = 106g
Volume of cylinder = 50mL
Volume difference = 31mL - 20mL = 11mL
Unknown:
Density of the metal = ?
Solution:
To find the density of the metal, we use;
Density = [tex]\frac{mass}{volume}[/tex]
Density = [tex]\frac{106}{11}[/tex] = 9.64g/mL
What is the percent composition of nitrogen in N 2 O
Answer:
28 %
Explanation:
Mass mass N2O = 28 + 16 = 44 mass nitrogen = 2 x 14 = 28 % nitrogen Chemistry.
4. When the mole fraction of solute is 1, there is
(a) a 1:1 ratio of solute to solvent.
(b) no solute present.
(c) only solute present.
(d) only solvent present.
(e) 1 mole of solute and 99 moles of solvent.
Answer:
(c) only solute present
Explanation:
In chemistry, the mole fraction, denoted by X, refers to the number of moles of a substance in a compound/mixture divided by the total number of substances in the same compound or mixture.
In this case, we can say that mole fraction represents the number of solutes to the number of solutes and solvent in the solution i.e. X = nA/nA + nB
Where; nA = number of solutes
nB = number of solvent
X = mole fraction.
Based on this analogy, When the mole fraction of solute is 1, there is only solute present. That is; X = 1 / 1 + 0
X = 1/1 = 1.
Which of the following reactions would have a decrease in entropy?
A. 2H20(g) → 2H2(g) + O2(9)
B. 2503(9) ► 2502(g) + O2(g)
C. 2NH3(9) ► N2(g) + 3H2(9)
D. 2NO2(g) → N204(9)
Answer:
D. 2NO2(g) → N204(9)
Explanation:
A p e x
2NO[tex]_2[/tex](g) → N[tex]_2[/tex]O[tex]_4[/tex](g) reactions would have a decrease in entropy. Therefore, the correct option is option D.
What is entropy?Entropy is a measureable physical characteristic and a scientific notion that is frequently connected to a condition of disorder, unpredictability, or uncertainty. From classical thermodynamic, where it was originally recognized, towards the microscopic explanation of nature within statistical physics, the name and concept are employed in a variety of disciplines.
It has numerous applications in physics and chemistry, biological systems and how they relate to life, cosmology, economics, society, weather science, and information systems, especially the exchange of information. 2NO[tex]_2[/tex](g) → N[tex]_2[/tex]O[tex]_4[/tex](g) reactions would have a decrease in entropy.
Therefore, the correct option is option D.
To know more about entropy, here:
https://brainly.com/question/14131507
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Which element below would most likely gain 3 electrons?
Answer:
Lithium
Explanation:
how many atoms are in 2.45 moles of hydrogen
Answer:
There are 1.4754246675000002e+24 atoms of Hydrogen within the measurement of 2.45 moles of hydrogen!
Explanation:
Which of the following statements is true about the relationship between atoms and molecules? A. Most atoms are bonded together to make a molecule. B. An atom can be seen by scientists, but a molecule cannot. C. Atoms and molecules are the same and have no differences.
Answer:
I believe the answer is A. molecules are larger than atoms so they should be visible and atoms and molecules are indeed different
To see the number of atoms of an element in a given molecule we need to multiply stoichiometry to the number that is written on the foot of the element that is stoichiometry. Therefore, the correct option is option A.
What is atom?
Atom is the smallest particle of any element, molecule or compound. Atom can not be further divided. Atoms contains nucleus in its center and electron that revolve around the atom in fixed orbit.
In the nucleus, proton and neutron are present. Electron has -1 charge while proton has +1 charge. Neutron is neutral that is it has no charge. So overall the charge of nucleus is due to only proton, not by neutron. Most atoms are bonded together to make a molecule. Molecules combine to form compounds.
Therefore, the correct option is option A.
To know more about atom, here:
https://brainly.com/question/13518322
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Which two factors are used to calculate the kinetic energy of an object?
Answer:
Mass and Velocity
Explanation:
hope this is the right answer might wrong tho
Answer:
its velocity and mass
Explanation:
I got it right on edg
HELPPPPPPPPPP
IDENTIFY THE ELEMENT WHICH HAS A GREATER ATOMIC MASS FLOURINE OR CLOURINE
Answer:
Cu Copper 63.546
Cl Chlorine 35.453
F Fluorine 18.998403
Explanation:
I don't know whether you asked for Cu or Cl so answered it both.
And this one please thank you.
Answer:
E
Explanation:
Look at bottom numbers.
90 → 88 + x
it means,
90=88+x
hence x = 2
it is also valid for top numbers.
230=226+y
y = 4
How many electrons does H have with a -1 charge
Answer:The electron has a negative charge and the proton has a positive charge, and these charges work against each other to make the electromagnetic force that holds the entire atom together.
Explanation:
This is the answer
I. define ionic bonding and describe how it can be formed between sodium and chlorine
ii. state 3 properties of the compound
III. what type of bonds is formed between two atoms of oxygen? describe how it formed
iv. state 3 properties of the substance in question (3) above
PLSSSS