A electrons in the innermost energy level
Atoms form chemical bonds using their outermost electrons, also known as valence electrons. The aim is to achieve a stable electronic configuration. An example can be seen in water molecules where oxygen shares its outermost electrons with hydrogen to form covalent bonds.
Explanation:Atoms form chemical bonds using their electrons in the outermost energy levels. These are known as valence electrons. The desire of atoms to reach a stable electronic configuration, often mimicking the electron configuration of noble gases, drives the formation of chemical bonds.
For example, in a water molecule (H2O), the oxygen atom shares its outermost electrons with two hydrogen atoms to form covalent bonds. These shared electrons provide each atom with a more stable electron configuration.
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15 POINTS! In the endocrine system, what is the function of a negative feedback loop?
Answer:
Negative feedback is a reaction that causes a decrease in function. It occurs in response to some kind of stimulus. Often it causes the output of a system to be lessened; so, the feedback tends to stabilize the system. This can be referred to as homeostatis.
Explanation:
The negative feedback of an endocrine system decreases the output and tends to maintain the stability of the system.
What is an endocrine system?An internal messenger system that contains feedback loops of hormones released by the internal glands of an organism. These hormones go directly into the circulatory system to regulate distantly target organs.
Negative feedback is a part of the endocrine system. It is a reaction that causes a decrease in function. It occurs in response to some kind of stimulus. Often it causes the output of a system to be lessened; so, the feedback tends to stabilize the system. This can be referred to as homeostasis.
Thus, we can conclude that the negative feedback of an endocrine system decreases the output and tends to maintain the stability of the system.
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In young’s experiment how must waves be vibrating to for interference to occur
A. Out of line
B. In line
C. In phase
D. Out of ohase
In phase for constructive interference and out of phase for destructive
which best describes how the sun rotates?
Answer:
The sun rotates more slowly at its poles.
Answer:
The sun rotates more slowly at its poles.
How does water affect metamorphic processes?
Answer:
When the temperature and pressure of a rock undergoing metamorphism changes. the composition of water allows materials to move more easily, the presence of fluids makes metamorphism more easy.he fluid changes also.
Explanation:
Answer:
It can have elevated concentrations of dissolved substances
Explanation:
Cause I happened to know
Which property describes the amount of energy that flows past a given area per unit of time
Answer:The property that describes the amount of energy that flows past a given area per unit of time is called energy flux, denoted by S1. It can be calculated by dividing the energy by the area A and the time interval Δ t. The formula for energy flux is S = Energy passing area A in time Δ t A Δ t = u c = ϵ 0 c E 2 = 1 μ 0 E B1. In electromagnetism, current density is the amount of charge per unit time that flows through a unit area of a chosen cross section2.
Explanation:
A sphere is charged with electrons to
−7 × 10−6 C.
How many electrons make up this charge?
The elemental charge is 1.6 × 10−19 C.
Answer:
[tex]4.38\cdot 10^{13}[/tex] electrons
Explanation:
The net charge on the sphere is equal to:
[tex]Q=-7\cdot 10^{-6}C[/tex]
This charge is made up of N electrons. Each electron carries a charge of
[tex]q=-1.6\cdot 10^{-19}C[/tex]
So the total charge is just the number of electrons times the charge of each electron:
[tex]Q=Nq[/tex]
And solving the equation for N, we find the number of electrons:
[tex]N=\frac{Q}{q}=\frac{-7\cdot 10^{-6}C}{-1.6\cdot 10^{-19} C}=4.38\cdot 10^{13}[/tex]
Your backpack has a mass of 8 kg. You drop it from a height of 1.3m. How much work is done by gravity as the backpack falls?
A. -102 J
B. -10.4 J
C. 102 J
D. 10.4 J
Answer:
The answer is C.
Explanation:
I guessed and it was right
Answer:
Work done by the gravity, W = 102 J
Explanation:
It is given that,
Mass of the backpack, m = 8 kg
It is dropped from the height of, h = 1.3 m
We have to find the work done by the gravity as the back pack fall. Work done by the gravity is given by the product of force and distance covered by an object. Mathematically, it is given by :
W = F × d
∵ F = m g
⇒ W = mg h
[tex]W=8\ kg\times 9.8\ m/s^2\times 1.3\ m[/tex]
W = 101.92 Joules
or
W = 102 Joules
So, the work done by the gravity is 102 J. Hence, this is the required solution.
The angle of reflection is the angle the ____ to the reflecting surface.
Reflected rays make with a perpendicular line
Instant raise makes with a perpendicular line
Instant ray makes with a parallel line
Reflected ray mix with a parallel line
Answer:
The angle of reflection is the angle the reflected rays make with a perpendicular line to the reflecting surface.
Explanation:
Reflection It is the change of direction suffered by a luminous ray when hitting the surface of an object. The angle of reflection is that which is formed by the reflected ray and the normal vector to the study surface
Answer:
Reflected rays make with a perpendicular line
an object at rest requires a force of 15 newtons to set it into motion. The force is greater than which force?
Answer:
Friction
Explanation:
Friction is a force that opposes the movement of an object's relative motion. Friction always goes against the attempted movement of the object when they are in contact. In other words, it is a force that prevents objects from sliding past each other.
The answer is friction.
I took the test and got it right.
Which best describes a material with a low index of refraction (near 1)?
A. It causes light to refract significantly.
B. The speed of light stays constant.
C. Is causes light to slow and refract very little.
D. Light is mostly reflected at a value near 1.
it causes light to slow and refract very little
Answer:
it causes light to slow and refract very little
Explanation:
its on my test
You use a pulley system to lift a fallen tree . You apply a force of 50 N and the pulley pulls on the tree with a force of 1300 N what is the mechanical advantage of the pulley ?
Mechanical Advantage = (output force) / (input force)
Mechanical Advantage = (1300 N) / (50 N)
Mechanical Advantage = 26
The mechanical advantage of pulley is that with less applied force we can get large amount of work.
To find the answer, we need to know about the pulley system.
What is a pulley system?A pulley system is a wheel on an axle or shaft which is designed to support the movement and change the direction of a taut cable or belt, or transfer the power between the shaft and cable or belt.
What is the basic idea of a pulley system work?In a pulley system, we get a huge amount of force from a less amount of applied force.
Thus, we can conclude that the mechanical advantage of pulley is that with less applied force we can get large amount of work.
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As object moving east, and it’s velocity changes from 65 m/s to 2/5ms in 10 seconds. Which describes acceleration?
Answer:
-4.0 m/s^2
Explanation:
Acceleration is defined as the rate of change in velocity:
[tex]a=\frac{v-u}{t}[/tex]
where
v is the final velocity
u is the final velocity
t is the time elapsed
For the object in this problem,
u = 65 m/s
v = 25 m/s
t = 10 s
So the acceleration is
[tex]a=\frac{25 m/s-65 m/s}{10 s}=-4.0 m/s^2[/tex]
The negative sign tells that the acceleration is opposite (=west) to the velocity (which is towards east).
Answer:
A
Explanation:
I’m gay
Which formula is used to calculate the mass of an object if the force and acceleration are known?
Answer: Multiply Both Volume And Density
Explanation: Multiply the volume and density together. Multiply your two numbers together, and you'll know the mass of your object.Keep track of the units as you do this, and you'll see that you end up with units of mass (kilograms or grams).
For this case we have by definition, Newton's second law of motion states that the force is directly proportional to the mass and to the acceleration of a body. That is to say:
[tex]F = m * a[/tex]
Where:
F: It's the strength
m: It's the mass
a: It's the acceleration
ANswer:
[tex]F = m * a[/tex]
Which of the following elements is stable? A. Boron, atomic number 5 B. Fluorine, atomic number 9 C. Carbon, atomic number 6 D. Neon, atomic number 10
Answer: neon atomic 10 hope this helps
Explanation:
Answer:
C.) Neon, atomic number 10
Explanation:
a mass of 2000 kg is raised 5.0 m in 10 seconds what is the potential energy of the mass at this height?
A. 98,000 J
B. 9,800 J
C. 0 J
Answer:
A. 98,000 J
Explanation:
The gravitational potential energy of an object is given by
U = mgh
where
m is the mass of the object
g is the gravitational acceleration
h is the heigth above the ground
In this problem,
m = 2000 kg
g = 9.8 m/s^2
h = 5.0 m
Substituting into the equation, we find
[tex]U=(2000 kg)(9.8 m/s^2)(5.0 m)=98,000 J[/tex]
Answer:
0 J
Explanation:
the object isn't moving, there is no kinetic energy. This question is worded poorly and made this not obvious.
Which is the correct symbol for an isotope of bromine with 35 protons and 38 neutrons?
Answer:
73/35 Br
Explanation:
The symbol for a bromine isotope with 35 protons and 38 neutrons corresponds to the acronym used to represent bromine, with the atonic number on the left side of this circle in the upper corner and the mass number on the left side of this acronym in the lower corner.
The number is the number of protons, in this case the atomic number is 35. The number of the mass is the sum between the number of protons and the number of neutrons, which in this case is 35 + 38 = 73. The acronym that corresponds to bromine is "Br".
With that, we can conclude that the correct symbol would be 73/35 Br
A yo-yo is swung around the head of a person in a horizontal circle. What provides the
centripetal force on the yo-yo?
Answer:
There is a net force towards the center of the circle that causes the yo-yo to seek the center.
Circular Motion Qualities:
-Constant speed
-Accelerating
-Velocity is changing constantly.
Centripetal acceleration perpendicular to the motion causes the object to change direction
a_c=v^2/r
Tangential acceleration in the direction of the motion causes and increase or decrease in speed.
Tension in the string towards the center provides the centripetal force in a a yo-yo swinging around a person's head.
Centripetal force is the force that keeps an object moving in a circular path. In the case of a yo-yo swung around a person's head, the centripetal force is provided by the tension in the string acting towards the center of the circle. This force allows the yo-yo to maintain its circular motion.
Application of a biot-savart law
can be used to determines the expression for magnetic field strength of a current element
The Biot-Savart law is important for calculating magnetic fields from current loops but can be complex and time-consuming. It requires the use of cross-products and integration along the current-carrying wire. When symmetry exists, Ampère's law might offer a simpler solution.
Explanation:One advantage of the Biot-Savart law is its ability to calculate the magnetic field produced by any current loop configuration, offering versatility in physics problems. A disadvantage is that it can be complex and time-consuming, particularly when dealing with intricate geometries where symmetry is lacking. When approaching a problem, if there is symmetry, one may consider Ampère's law as an alternative for simplifying calculations especially when a clear path of integration is present.
To apply the Biot-Savart law, it is necessary to define the current element dI and unit vector r, calculate their cross-product, and integrate this across the length of the current-carrying wire. This allows determination of the magnetic field's magnitude and direction. In specific setups, such as calculating the magnetic field of an infinite wire, the desired precision dictates certain assumptions like treating finite segments as effectively infinite when they align closely with the wire's length.
Overall, the Biot-Savart law provides a powerful tool for understanding how current-carrying wires influence the magnetic fields in their vicinity, which is a foundational concept in electromagnetism.
a 300-kg crate is placed on a adjustable incline plane. as one end of the incline is raised, the crate begins to move downward. if the crate slides down the plane with the acceleration of .70 m/s2 , when the incline is 25degrees, what is the coefficient of kinetic friction between ramp and crate?
Final answer:
To find the coefficient of kinetic friction, use the formula μk = a - sinθ / cosθ where a is acceleration and θ is the angle of the incline. By substituting the given values (a = 0.70 m/s², θ = 25°), the coefficient of kinetic friction is approximately 0.285.
Explanation:
The coefficient of kinetic friction can be calculated using the formula:
μk = a - sinθ / cosθ, where a = acceleration and θ = angle of incline.
Plugging in the values given (a = 0.70 m/s², θ = 25°), we get μk ≈ 0.285.
Safety precautions taken while determining the melting point of naphthalene using cooling curve
The safety measures include wearing appropriate safety gear, slow and even heating, not leaving the experiment unattended, allowing the test tube to cool gradually after melting, and appropriate disposal.
Explanation:Determining the melting point of naphthalene through a cooling curve requires adherence to numerous safety precautions. The most crucial is to use safety equipment appropriately, such as wearing protective goggles, a lab coat, and gloves. Secondly, you must ensure to heat the naphthalene slowly and evenly to prevent it from catching fire as it's flammable. Keep the surrounding area free from flammable materials. In case of a sudden increase in temperature or boiling, turn off the heat source immediately.
Lastly, never leave the experiment unattended. After the naphthalene has melted, let the test tube cool gradually, and do not immerse it in cold water, as it could shatter from thermal shock. Dispose of the melted naphthalene according to your school's laboratory safety protocols.
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a 225 kg bumper is moving north at .98 m/s when it hits a 198 kg car moving north at .28 m/s. the 198 kg car is moving north at .71 m/s after the collision. what is the post collision velocity of the 225 kg car?
Answer:
= 60.16 cm/s or 0.6 m/s
Explanation:
Using the formula for collision;
M1U1 + M2U2 = M1V1 + M2V2
Therefore;
(225 kg)•(98 cm/s) + (198 kg)•(28 m/s) = (225 kg)•v + (198 kg)•(71 cm/s)
22050 kg•cm/s + 5544 kg•cm/s = (225 kg)•v + 14058 kg•cm/s
13536 kg•cm/s = (225 kg)•v
v = 60.16 cm/s
Therefore; the post collision velocity of the 225 kg car is 60.16 cm/s
What is the current in the 10.0 , resistor?
120.0 V
10.00
20.00
30.00
O A. 2.00 A
O B. 12.0 A
O C. 22.0 A
O D. 10.0 A
Answer:
B. 12.0A
Explanation:
The circuit shown in the image is a parallel circuit which mean that the voltage of the source is equal across each resistance in the circuit because they are directly connected to the terminals of the voltage source.
The voltage across the 10 Ohms resistor is 120V
So, let's proceed to calculate the current
By using Ohm's Law
[tex]I=\frac{V}{R} \\I= \frac{120.0V}{10.0Ohm} \\I= 12.0A[/tex]
12A is the amount of current flowing through the 10 ohms resistor.
Current = (voltage) / (resistance)
The ends of the 10-ohm resistor are connected directly to both terminals of the battery.
So the voltage across the resistor is the voltage of the battery ... 120 V. None of that other stuff in the circuit has any effect on it.
Current = (120 V) / (10 ohms)
Current = 12 A . (B)
Calculate [H3O+
] of a 0.150 M acetic acid solution.
Answer:
[H3O+] = 0.00520 M
Explanation:
The dissociation of acetic acid in water is given by the equation;
CH3COOH + H2O<-------> H3O+ + CH3COO-
ka = [H+][C2H3O2-]/[HC2H3O2]
Ka = 1.8 x 10^-5
= x^2 / 0.150-x
x = [H3O+]= 0.00520 M
Modern oil tankers weigh over a half-million tons and have lengths of up to one-fourth mile. Such massive ships require a distance of 5.1 km (about 3.2 mi) and a time of 18 min to come to a stop from a top speed of 34 km/h.
(a) What is the magnitude of such a ship's average acceleration in m/s2 in coming to a stop?
(b) What is the magnitude of the ship's average velocity in m/s?
(a) [tex]-1.46\cdot 10^{-4} m/s^2[/tex]
The average acceleration of the ship is given by
[tex]a=\frac{v-u}{t}[/tex]
where
v is the final velocity
u is the initial velocity
t is the time elapsed
Here we have:
[tex]u=34 km/h =9.44 m/s[/tex] is the initial velocity
v = 0 is the final velocity
[tex]t=18 min =64800 s[/tex] is the time elapsed
Substituting, we find
[tex]a=\frac{0-9.44 m/s}{64800 s}=-1.46\cdot 10^{-4} m/s^2[/tex]
(b) 4.72 m/s
Assuming the acceleration is uniform, the average velocity of the ship is given by:
[tex]v_{avg} = \frac{v+u}{2}[/tex]
where
v is the final velocity
u is the initial velocity
Here we have:
v = 0
u = 9.44 m/s
So the average velocity of the ship is
[tex]v_{avg} = \frac{0+9.44 m/s}{2}=4.72 m/s[/tex]
electric current is the flow of charged particles called blank .
The electric current is measured in coulombs per second. A flow of one coulomb per second is called one ampere
The electric current is the flow of electrons which are negatively charged particles.
Explanation:
The flow of electrons in a circuit is called the electric current. It is measured with one coulomb of charge across the circuit in 1 second that is called an ampere. This ampere is the standard unit of electric current.
The flow of electrons across the circuit is achieved by the potential difference across the circuit. This potential difference is the difference of electrical voltage generated across the circuit in order to achieve flow of current.
Please tell me the order the answers go. Best and most correct answer gets Brainliest.
See the attached picture:
In both the U.S. House of Representatives and U.S. Senate, which of the selections below is elected by the party with the most members of that chamber?
Select one:
A. Party Conference Committee Chair
B. Majority Leader
C. Minority Whip
D. Majority Whip
Answer In Letter form please
I believe the answer is B
Answer:
B
Explanation:
Because its just b trust me
Which part of an atom has most of its mass? A. electrons B. neutrons C. nucleus D. protons
The nucleus has most of the atomic mass in an atom. The nucleus is made up of protons and neutrons.
The nucleus of an atom is located at its center and contains most of its mass. The correct answer is C.
It is composed of protons and neutrons, which are collectively known as nucleons. Protons have a positive charge, while neutrons have no charge. Electrons, on the other hand, are negatively charged particles that orbit the nucleus in energy levels or shells.
Although electrons are much lighter than protons and neutrons, they occupy a larger volume around the nucleus due to their lower mass. The mass of an electron is approximately 1/1836th the mass of a proton or neutron.
Therefore, when considering the total mass of an atom, the mass of the electrons is relatively insignificant compared to the mass of the nucleus, which is primarily composed of protons and neutrons. The correct answer is C.
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A student has an 80 g sample of a radioactive material that has a half-life of 20 seconds. How much material will he have left after one minute?
a) 40 g
b) 1.33 g
c) 5 g
d) 10 g
Answer:
= 10 g
Explanation:
Half life is the time taken by a radioactive substance to decay by half of the original mass or initial amount.
Therefore, to get the new mass after decay;
New mass = Original mass × (1/2)^n ; where n is the number of half lives.
n = 60 seconds/20 seconds
= 3
Therefore;
New mass = 80 g × (1/2)^3
= 80 g × 1/8
= 10 g
A circuit that has only a single path for current to flow through is best classified into which category?
Answer:
A series circuit
Explanation:
A circuit that has only a single path for current to flow through is best classified into which category?
a series circuit
an open circuit
a parallel circuit
a short circuit
Explanation:
The reason that A ( a series circuit ) is the answer is because in a series circuit, it only allows for current to flow in one single path.
Answer: A series circuit
Explanation: A circuit that has only a single path for current to flow through is best classified into which category?