Answer:
example of kinetic theory include brownian motion the random movement of the particles because the consolation with the air molecules and how gas is behave boiling and j l also this cyclone explain how temperature affects the
What is the concentration of H+ ions at a pH = 8?
mol/L
What is the concentration of OH– ions at a pH = 8?
mol/L
Taking into account the definition of pH and pOH, the concentration of H⁺ ions at pH=8 is 1×10⁻⁸ M and the concentration of OH⁻ ions at pH=8 is 1×10⁻⁶ M.
Definition of pHpH is a measure of acidity or alkalinity that indicates the amount of hydrogen ions present in a solution or substance.
The pH is defined as the negative base 10 logarithm of the activity of hydrogen ions, that is, the concentration of hydrogen ions or H₃O⁺:
pH= - log [H⁺]= - log [H₃O⁺]
Definition of pOHSimilarly, pOH is a measure of hydroxyl ions in a solution and is expressed as the logarithm of the concentration of OH⁻ ions, with the sign changed:
pOH= - log [OH⁻]
Relationship between pH and pOHThe following relationship can be established between pH and pOH:
pOH + pH= 14
Concentration of H⁺ ionsIn this case, pH=8. Replacing in the definition of pH:
8= - log [H⁺]
Solving:
[H⁺]= 10⁻⁸= 1×10⁻⁸ M
Finally, the concentration of H⁺ ions at pH=8 is 1×10⁻⁸ M.
Concentration of OH⁻ ionsBeing pH= 8, pOH is calculated as:
pOH + 8= 14
pOH= 14 - 8
pOH= 6
Replacing in the definition of pOH the concentration of OH⁻ ions is obtained:
- log [OH⁻]= 6
Solving
[OH⁻]= 10⁻⁶= 1×10⁻⁶ M
Finally, the concentration of OH⁻ ions at pH=8 is 1×10⁻⁶ M.
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The event in the life of a star that begins its expansion into a giant is Group of answer choices almost all the hydrogen in its core that was hot enough for fusion has been turned into helium as much as 90% of the star explodes violently the core reaches a temperature of ten million degrees the star's internal structure reaches equilibrium for the first time in its life
The event in the life of a star that begins its expansion into a giant is that almost all the hydrogen in its core that was hot enough for fusion has been turned into helium.
What is a fusion reaction?A fusion reaction is defined as the type of nuclear reaction whereby two or more atomic nuclei combine to form a heavier nucleus.
The stars are being transformed into giants through fusion reaction.
A higher amount of hydrogen is found in the core of the star which is being use up in the fusion reaction to form helium.
When the hydrogen in the centre of a star runs out, the star begins to use hydrogen further out from its core. This causes the outer layers of the star to expand and cool.
Therefore, the event in the life of a star that begins its expansion into a giant is that almost all the hydrogen in its core that was hot enough for fusion has been turned into helium.
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A man walks 30 m to the west, then 5 m to the east in 45 seconds.
a. What is his displacement?
b. What was his total distance walked?
c. What is his average velocity?
Answer:
a. Displacement=30²+5²=925= 30.4m
b. Total distance=30m+5m=35m
c. V=s/t. = 30.4/45=0.6m/s
If a hyperpolarizing graded potential and a depolarizing graded potential of similar magnitudes arrive at the trigger zone at the same time, what is most likely to occur
The likely outcome when a hyperpolarizing and a depolarizing potential of similar magnitudes arrive simultaneously at the trigger zone is the cancellation of charges.
What is membrane action potential?Membrane action potential refers to differential electric charges within and outside of a given cell.
Hyperpolarization refers to a differential membrane potential of a cell associated with a negative charge, whereas depolarization is associated with a positive charge.
In conclusion, the likely outcome when a hyperpolarizing and a depolarizing potential of similar magnitudes arrive simultaneously at the trigger zone is the cancellation of charges.
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The ability for a muscle to work against a resistance for an extended period of time is.
Muscular Endurance refers to the ability for a muscle to work against a resistance for an extended period of time
Endurance :-
Perseverance is connected with the capacity to perform work over a drawn out timeframe. Youngsters, for instance, can play effectively for hours. Endurance can be impacted by a singular muscle, a muscle bunch, or the complete body. Muscle perseverance mirrors the capacity to support rehashed muscle compression and is connected with muscle strength.
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If a ball is thrown into the air with a velocity of 45 ft/s, its height in feet after t seconds is given by y=45t-15t2. Find the instantaneous velocity when t=4
Given that a ball is thrown into the air and its height in feet after t seconds is given by y = 45t - 15t², the instantaneous velocity when t=4 is -75ft/s.
What is the instantaneous velocity when t=4?Given that;
Initial velocity = 45ft/sHeight in feet after t seconds is given by y = 45t - 15t² Instantaneous velocity = ?First, we determine the derivative of y = 45t - 15t²
y' = (1)45 - (2)15t
y' = 45 - 30t
We substitute in t = 4
y' = 45 - 30t
y' = 45 - 30(4)
y' = 45 - 120
y' = -75ft/s
Given that a ball is thrown into the air and its height in feet after t seconds is given by y = 45t - 15t², the instantaneous velocity when t=4 is -75ft/s.
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Question 8 of 10
What is the equivalent resistance of the circuit?
120.0 V
OA. 40.0 2
Β. 200.0 Ω
C. 20.02
D. 80.0 2
60.002
20.0 Ω
The equivalent resistance of the circuit will be option (D) 80.0 Ω
According to Ohm's law, the voltage across two places is precisely proportional to the current flowing through a conductor between them.
The obstruction to current flow in an electrical circuit is measured by resistance. The Greek letter omega (Ω) represents the unit of measurement for resistance, known as ohms. Georg Simon Ohm is the name given to ohms.
Since in the given figure the resistance are in series so there equivalent resistance will be sum of the two resistance. If they were in parellal connection then we will add reciprocal of their resistance.
Let R1 = 60 Ω and R2 = 20 Ω. So their equivalent resistance will be as follow:
R = R1 + R2
R = 60 + 20
R = 80 Ω
Hence the equivalent resistance of the circuit will be 80 Ω
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Which vector is the sum of the vectors shown below?
A.
B.
C.
D.
Answer:
B.
Explanation:
The addition of vectors is commutative, so adding in any order will lead to the same result; just draw a straight line from the starting point to the tip of the final vector.
What are Quartz-crystal Clocks??
_
_
_
_
Don't spam.
Answer:
It is a piezoelectric material. It produces and accumulates electric charge when subjected to mechanical stress
A 7.00 kg bowling ball is held 2.00 m above the ground. using g = 9.80 m/s2, how much energy does the bowling ball have due to its position? 68.6 j 137 j 274 j 960 j
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The potential energy of the bowling ball due to its position above the ground is 137.2 Joules. Therefore, the correct answer is 137 J The correct option is (b).
Given:
mass (m) = 7.00 kg
gravitational acceleration (g) = 9.80 m/s²
height (h) = 2.00 m
The potential energy of the bowling ball due to its position above the ground, we can use the formula for gravitational potential energy:
Potential Energy (PE) = mass × gravitational acceleration × height
The potential energy:
PE = 7.00 × 9.80 × 2.00 m
PE = 137.2 Joules
So, the potential energy of the bowling ball due to its position above the ground is 137.2 Joules. Therefore, the correct answer is 137 J (b).
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what is contact and non-contact force ?
define frictional force ,normal reaction force, tension force as applied through string,force exerted by spring, force exerted by during collision, gravitational force , electrostatic force ,magnetic force.
Explanation:
Hello !
Contact force:-A contact force is any force that requires contact to occur. examples Applied force,
Normal force,
Frictional force,
Tension force,
Air resistance force,
Spring force.
Non-contact force:-is a force which acts on an object without coming physically in contact with it. types of non-contact forces are gravitational force, magnetic force, electrostatic and nuclear force.
frictional force:-is the force resisting the relative motion of solid surfaces, fluid layers, and material elements sliding against each other.
Normal reaction force:-A force acting perpendicular to two surfaces in contact with each other.
The tension force is defined as the force that is transmitted through a rope, string or wire when pulled by forces acting from opposite sides.
The force exerted by a spring on objects attached to its ends is proportional to the spring's change in length away from its equilibrium length and is always directed towards its equilibrium position. F = -kx. The proportional constant k is called the spring constant.
During the collision, each body exerts a force on the other. This force is called an impulsive force.
The gravitational force :-is a force that attracts any two objects with mass. We call the gravitational force attractive because it always tries to pull masses together, it never pushes them apart.
The electrostatic force is also known as the Coulomb force or Coulomb interaction. It's the attractive or repulsive force between two electrically charged objects.
magnetic force, attraction or repulsion that arises between electrically charged particles because of their motion.
What do velocity, acceleration, force, and displacement, have in common?
Velocity, acceleration, force, and displacement, have magnitude and direction (ie vector quantity) in common
What is a vector quantity?This is a which have both magnitude and direction. Example include:
VelocityDisplacement ForceAccelerationMomentWeightWhat is a scalar quantity?This is a quantity which has magnitude but no direction. Example include:
WorkEnergySpeedMassTimeDistanceFrom the above, we can see that velocity, acceleration, force, and displacement, have magnitude and direction (ie vector quantity) in common
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You push a 50.0 kg box across a floor at a constant speed of 2.0m/s. If the coefficient of friction between the two surfaces is 0.20, then how much force are you exerting on the box? If you stop pushing, then how far will the box slide before coming to rest? Start by drawing a FBD.
(a) The force applied on the box is 98 N.
(b) When you stop pushing, the displacement of the box before coming to rest is 1.02 m.
Force exerted on the box
The force exerted on the box is calculated from Newton's second law of motion.
F - Ff = ma
where;
a is acceleration of the boxF is applied forceFf is frictional forceat constant speed, a = 0
F - Ff = 0
F = Ff
Ff = μmg
Ff = 0.2 x 50 x 9.8
Ff = 98 N
When you stop pushing, applied force = 0F - Ff = ma
-Ff = ma
a = -Ff/m
a = -98/50
a = - 1.96 m/s²
Displacement of the boxv² = u² + 2as
when the box stops, v = 0
0 = u² + 2as
0 = (2)² + 2(-1.96)s
0 = 4 - 3.92s
3.92s = 4
s = 4/3.92
s = 1.02 m
When you stop pushing, the displacement of the box before coming to rest is 1.02 m.
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The wave equation says that a wave's speed is equal to its wavelength times its _________________.
Answer:
Frequency
Explanation:
speed = wavelength * speed
a truck of mass 1500kg is moving with a constant speed of 10m/s . what is the translation kinetic energy of the truck?
The translational kinetic energy of the truck is 75000 Joules (J). The correct answer is 75000 Joules (J).
Given information:
Mass of the truck (m) = 1500 kg
Speed of the truck (v) = 10 m/s
The translational kinetic energy (KE) of an object is given by the formula:
KE = (1/2) × m × v²
where:
KE is the translational kinetic energy,
m is the mass of the object,
v is the speed of the object.
The translational kinetic energy of the truck:
KE = (1/2) × 1500 × (10)₂
KE = (1/2) × 1500 × 100
KE = 75000
KE = 75000 Joules (J)
So, the translational kinetic energy of the truck is 75000 Joules (J).
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Draw a ray diagram for a diverging lens that has a focal length of -10 cm when an object is placed 30 cm from the lens's surface. Calculate the position of the image and list the characteristics of the image.
Explanation:
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Which action can humans take to reduce wave erosion?
build drainage systems
build houses near coastlines
build breakwaters in the ocean
reduce vegetation along coastlines
The action that humans can take to reduce wave erosion is to build breakwaters in the ocean.
What is erosion?The term erosion has to do with the washing away of top soil either by water or by wind. The control of erosion is a very important soil conservation effort.
Hence, the action that humans can take to reduce wave erosion is to build breakwaters in the ocean.
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Answer: (C) build breakwaters in the ocean
Explanation: Got it on edge
A.
emotional health : expressing feelings
B.
physical health : respecting others
C.
mental health : living in harmony with the environment
D.
social health : getting adequate sleep
Emotional health: expressing feelings is the phrases that belong together. The best answer from the choices provided willl be A.
What is good Health?The condition of complete physical, mental, and the absence of sickness and disability is called good health.
Which of the following phrases belong together?
A.
emotional health: expressing feelings
B.
physical well-being: regard for others
C.
Social health: obtaining enough sleep
D
Mental health: living in harmony with the environment
The concepts "emotional wellness" and "expressing feelings" go hand in hand. The best response from the available options is going to be A.
Hence, the best answer from the choices provided willl be A.
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The data table shows how the amplitude of a mechanical wave varies with the energy it carries. Analyze the data to identify the mathematical relationship between amplitude and energy. Use your equation to find the energy if the amplitude is 6 units. Amplitude Energy 1 unit 2 units 2 units 8 units 3 units 18 units 4 units 32 units A. 66 units B. 60 units C. 72 units D. 74 units
The energy of a wave is directly proportional to the square of the amplitude of the wave.
What is the relationship between energy and amplitude?There is direct relationship between energy of the wave and the amplitude of the wave. The energy transported by a wave is directly proportional to the square of the amplitude of the wave. This means if energy is increase the amplitude of wave becomes double and vice versa.
Energy = (amplitude)2
So we can conclude that the energy of a wave is directly proportional to the square of the amplitude of the wave.
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[tex]Energy = (amplitude)^{2}[/tex]
What is energy and amplitude?Energy is define as the capacity for doing work.
Amplitude is the maximum displacement or distance moved by a point on a vibrating body or wave measured from its equilibrium position.
So , the relationship between energy of the wave and the amplitude of the wave is described as the energy transported by a wave is directly proportional to the square of the amplitude of the wave.
Here , If energy is increase the amplitude of wave becomes double.
[tex]Energy = (amplitude)^{2}[/tex]
Hence , the energy of a wave is directly proportional to the square of the amplitude of the wave.
By using the above equation if the amplitude is 6 Units then :
Energy = [tex](6)^{2}[/tex] = 36 units
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Please help: when lorenzo was growing up, his family did not have access to health care. now that he is a father and has access to health care through his work, he wants to make sure he does all he can to promote the health of his own children. how will access to health care help promote a healthier start in his children's lives? how will this promotion of health affect disease prevention for these children? why is it important for lorenzo to establish and implement health maintenance for his family members of all ages? in what ways can he access health services for his entire family?
Answer:
first answer:He can promote healthier start in the children's life by trying to avoid what he encounter when he has no access to health care.
a compact car is about 1289 kg and its engine has the ability to generate 183831 W. if all that power is applied from a stand still and no energy is dissipated, how fast will the car be moving after 7 seconds.
The speed of the car moving after 7 seconds will be 31.5 m/sec.
What is velocity?The change of distance with respect to time is defined as speed. Speed is a scalar quantity. It is a time-based component. Its unit is m/sec.
The given data in the problem is
m is the mass of the car = 1289 Kg.
u is the initial velocity = 0 m/sec
a is the acceleration in m/sec²
v is the velocity after 7 seconds =?
The power developed is;
P =FV
F=ma
P=maV
183831=1289 kg × a × V
a = 142.61 / V
From Newton's second equation of motion;
V=u+at
V=0+at
V=(142.61/V)t
V²=142.61 × 7
V=31.5 m/sec
Hence, the speed of the car moving after 7 seconds will be 31.5 m/sec.
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I turn a glass upside down, trap the air in it by putting it in water, and then i take the glass down to 10 metres/33 feet. The air space would
The air space would be half the size it was at the surface.
What is airspace?It should be noted that airspace means the portion of the atmosphere controlled by a country that's above its territory.
Based on the information given, the The air space would be half the size it was at the surface.
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which statement illustrates how progress in engineering has affected the natural enironment
The statement that illustrates how progress in engineering has affected the natural environment is extracting mineral resources with modern mining equipment removes fertile topsoil.
What is the Natural Environment?The natural environment may be defined as anything that can be present in the surroundings of living entities whether it is a biotic or abiotic factor.
The utilization of contemporary mining tools terminates fertile topsoil and admiringly impacts the fertility of the soil. It is tough to rebuild topsoil and modern mining tools constantly damage soil fertility.
Advancement in engineering has influenced the natural environment and mining is one of the most accepted measures of this.
The complete question is as follows:
Extracting mineral resources with modern mining equipment removes fertile topsoil.Mining companies use modern equipment to extract mineral resources more efficiently.Modern mining equipment has improved the health and safety of workers.Modern mining practices provide materials that can be used for technological advances.Therefore, it is well described above.
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Hydrogen fusion in the Sun requires a temperature (in Kelvin) of Group of answer choices any temperature, as long as gravity is strong enough. millions of degrees. billions of degrees. thousands of degrees.
Any temperature, as long as gravity is strong enough, may cause hydrogen fusion in the Sun, which requires a temperature of millions of degrees. Option A is correct.
What is the helium fusion process?When the temperature in the core hits around 100 million degrees, the helium will begin to fuse into carbon in a mechanism known as the triple-alpha process
Any temperature may result in hydrogen fusion in the Sun, which needs a temperature of millions of degrees, as long as gravity is strong enough.
Hence option A is correct.
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grade 9 psyhics giving brainly
Answer:
B
Explanation:
If the liquid leaked, there would be less pressure and thus less force which is only reflected by one answer choice.
suggest why it is better to use light gates and a computer than to use a stopwatch and a ruler to measure the speed of a toy car
Human response times are eliminated from time measurement using light gates. if the stopwatch is damaged, the data logger terminates it.
What is speed?Speed is defined as the rate of change of the distance or the height attained. it is a time-based quantity. it is denoted by u for the initial speed while u for the final speed. its si unit is m/sec.
To measure the speed of a toy automobile, it is preferable to utilize light gates and a computer as opposed to a stopwatch and a ruler.
Because Light gates eliminate the effects of human reaction delays for measuring time. is damaged,
The stopwatch is stopped by the data logger. With no reaction time, the uncertainty is substantially reduced.
The average speed may be determined by measuring the distance between the two light gates.
Hence, it is better to use light gates and a computer than to use a stopwatch and a ruler to measure the speed of a toy car.
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The sun is considered a G2V star. What does the "V" indicate in this designation? Question 21 options: That the sun is a main sequence star. That the sun has an absolute magnitude of 5.0. That the sun is a member of the fifth generation of stars in the universe. That the sun is a star visible from Earth with the unaided eye.
The function of V" in this designation is A. That the sun is a main sequence star
What is the sun?It should be noted that the sun is the star at the center of the solar system.
In this case, the function of V" in this designation is that the sun is a main sequence star
In conclusion, the correct option is A.
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The vertical component of 9N is found to be four-thirds of the horizontal component.
a) Find the horizontal component.
b)Find the magnitude of the vector
Answer:
a) Let horizontal component be h
4/3×h= 9
4h = 9x3
h = 27/4
b) Magnitude = √ [9²+ (27/4)²
= 11.25
Kylie has a modern quarter with a mass of 5.623\,\text{g}5.623g5, point, 623, start text, g, end text and an older silver quarter with a mass of 6.24\,\text{g}6.24g6, point, 24, start text, g, end text. What is the combined mass of the quarters
The combined mass the quarters, given that the modern and old quarters has masses of 5.623 g and 6.24 g respectively is 11.863 g
Data obtained from the questionMass of modern quarter = 5.623 gMass of old quarters = 6.24 gCombine mass =?How to determine the combine massThe combine mass of the quarter can be obtained by simply adding the masses of the individual quarters together. This is illustrated below:
Combine mass = mass of modern + mass of old
Combine mass = 5.623 + 6.24
Combine mass = 11.863 g
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A 500. gram cart with a speed of 0.360 m/s hits a barrier and bounces back with a return velocity of -0.240 m/s. what is its change in momentum?
a. 60.0 kg*m/s
b. 0.300 kg*m/s
c. -0.300 kg*m/s
d. .0600 kg*m/s
e. -.0600 kg*m/s
The change in the momentum of the cart,given the data is 0.06 Kgm/s (Option D)
What is momentum?Momentum is defined as the product of mass and velocity. It is expressed as
Momentum = mass × velocity
Change in momentum = mass (final velocity - initial velocity)
How top determine the change in the momentumFrom the data given above, the following data were obtained:
Mass (m) = 500 g = 500 / 1000 = 0.5 KgInitial velocity (u) = 0.360 m/sFinal velocity (v) = -0.240 m/s.Change in momentum =?Change in momentum = m(v + u) (renounce)
Change in momentum = 0.5 (-0.24 + 0.36)
Change in momentum = 0.5 × 0.12
Change in momentum = 0.06 Kgm/s
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