Answer:
B
Explanation:
MOST elements on the periodic table are metals.
Answer:B
a tennis ball has a mass of 57.5 g, how much does it weigh? (do a conversion)
Answer:
0.1267658 pounds
0.0575kg
Explanation:
You were not specific at to which measurement you would have liked me to convert it to. I assume it would be in kilograms since that is the measurement used in science for weight. I have added pounds as well in case you were looking for an alternative weight.
The force of air particles over an area is A.) temperature B.) pressure C.) Volume D.) Kelvins
Answer:The anwser is B i Promise ok
Explanation:
Answer: B
Explanation: I just did it.
Select the correct answer. Samuel adds a teaspoon of salt to a glass of water. He notices that the salt disappears. Samuel takes a sip to discover that the water tastes salty. What kind of change has occurred? A. It’s a chemical reaction because a new substance has formed. B. It’s a physical change because the water and the salt kept their original properties. C. It’s an example of synthesis because two substances reacted to give one substance. D. It’s a chemical reaction because the water now tastes salty but originally did not.
Answer:
A
Explanation:
A chemical reaction is a process that leads to the chemical transformation of one set of chemical substances to another. Therefore it can not be any of the other answers because the substance was water at first but now its salty water.
ps what kind of person would drink water after you put salt in it lol.
In your mouth the food mixes with saliva and is mechanically broken into smaller pieces this is called
digestion is what you call it
did it help
Answer:
wouldnt it be chewing or breaking down the food because digesting would be more after you swallow the food and it said in your mouth
Explanation:
Unlike velocity, speed is scalar, which means it is described by only.
There are two qualities that can describe most variables - direction and magnitude. A vector possesses both a direction and magnitude, while a scalar possesses only a magnitude.
Hope this helps!
Answer:
It can be described on by its magnitude
MAGNITUDE
Explanation:
Vector quantities are described by their magnitude and their direction both
so all vector quantities like velocity etc need direction and magnitude both like velocity is given as 60 km/h towards North direction
But for scalar quantities we defined them only by their magnitudes
Like here if we define mass then we do not require any direction for its complete explanation.
so here correct answer will be
MAGNITUDE
planet-solar system-galaxy-local group. what comes next
Answer:
Super cluster
Explanation:
calculate the electrical energy consumed by 1200 W toaster in 30 min
Electrical energy = Power x time.
30 minutes = 0.5 hours.
Electical energy = 1200W x 0.5 hours = 600W/hour = 0.6kWh
Two identical ions are each missing two electrons, each ion has a charge of 2e. What is the magnitude of the force between the ions when their separation is 2.1×10−10m? k=8.99×109N⋅m2/C2, e=1.60×10−19C
Answer:
|F| = 2.09 × 10⁻⁸ assuming that the two ions are point charges.
Explanation:
What's the charge on each ion?
The symbol [tex]e[/tex] here stands for fundamental charge. Each electron carries a negative fundamental charge of -e. Each proton carry a positive fundamental charge of +e.
Molecules and atoms are neutral. They contain an equal number of electrons and protons. Remove one electron from a molecule or atom, and that particle will end up with more protons (which are positive) than electrons. That particle will carry a positive charge of +e become an ion (a cation to be precise.) Remove another electron and the ion will carry a charge of +2e.
For each ion [tex]q = +2 \;e = 2\times 1.60\times 10^{-19}\;\text{C} = 3.2\times 10^{-19}\;\text{C}[/tex].
What's the size of the electrostatic force between the two ions?
Consider Coulomb's Law for the electrostatic force [tex]F[/tex] between two point charges:
[tex]\displaystyle F = -\frac{k\cdot q_1\cdot q_2}{r^{2}}[/tex],
where
[tex]k[/tex] is Coulomb's constant,[tex]q_1[/tex] and [tex]q_2[/tex] are the charge on the two point charges, and[tex]r[/tex] is the separation between the two charges.Make sure that all values are in SI units. Assume that the two ions are small enough that they act like point charges:
[tex]\displaystyle \begin{aligned}F &= -\frac{k\cdot q_1 \cdot q_2}{r^{2}}\\&=-\frac{8.99\times 10^{9}\cdot(3.2\times 10^{-19}) \cdot (3.2\times 10^{-19})}{(2.1\times 10^{-10})^{2}}\\ &= -2.09\times 10^{-8}\;\text{N}\end{aligned}[/tex].
The value of [tex]F[/tex] is negative, meaning that the two charges will repel each other because they are both positive. The question is asking for the magnitude of this force. Thus drop the sign in front of [tex]F[/tex] to obtain [tex]2.09\times 10^{-8}\;\text{N}[/tex], which is the magnitude of [tex]F[/tex].
Using Coulomb's Law, the magnitude of the force between two identical ions, each missing two electrons and separated by 2.1×10⁻¹⁰ m, is approximately 2.09 × 10⁻⁹ N.
To find the magnitude of the force between two identical ions, we use Coulomb's Law:
F = k × (q1 × q2) / r²
Here, k is the electrostatic constant, 8.99 × 10⁹ N⋅m²/C², q₁ and q₂ are the charges of the ions, and r is the separation distance between them.
Given:
Each ion has a charge of 2e, where e is the elementary charge (1.60 × 10⁻¹⁹ C).Separation distance r = 2.1 × 10⁻¹⁰ m.First, calculate the charge of each ion:
q₁ = q₂ = 2 × 1.60 × 10⁻¹⁹ C = 3.20 × 10⁻¹⁹ C
Next, substitute the values into Coulomb's Law:
F = (8.99 × 10⁹ N⋅m²/C²) × [(3.20 × 10⁻¹⁹ C) × (3.20 × 10⁻¹⁹ C)] / (2.1 × 10⁻¹⁰ m)²
Simplify the calculation:
F = (8.99 × 10⁹) × (10.24 × 10⁻³⁸) / (4.41 × 10⁻²⁰)
F ≈ 2.09 × 10⁻⁹ N
Therefore, the magnitude of the force between the ions is approximately 2.09 × 10⁻⁹ N.
Which of the following has to happen before the eardrum begins to vibrate with the same frequency as the source of the sound waves? A. Vibrations have to be transmitted to the fibers of the auditory nerve. B. Impulses have to be sent to the brain through the auditory nerve. C. The outer ear has to collect the sound waves and lead them to the middle ear. D. The brain has to interpret the direction from which the sounds are being delivered.
Answer:
C. The outer ear has to collect the sound waves and lead them to the middle ear.
Explanation:
In the process of hearing, the first thing that happens is that sound waves enter the outer ear through a passage called "auditory canal" that reaches the eardrum.
The movement of the incoming sound waves causes the eardrum to vibrate and transmit these vibrations to three tiny bones of the middle ear.
Answer: i think its c
An X-ray tube emits X-rays with a wavelength of 1.0 X 10^-11 m. Determine the energy, in electron volts, possessed by the incident electrons
Answer:
[tex]1.25\cdot 10^5 eV[/tex]
Explanation:
The energy of the incident electron is equal to the energy acquired by the X-rays photon emitted by the tube, which is given by
[tex]E=\frac{hc}{\lambda}[/tex]
where
h is the Planck constant
c is the speed of light
[tex]\lambda[/tex] is the wavelength
In this problem, the wavelength of the photon is
[tex]\lambda=1.0\cdot 10^{-11} m[/tex]
Therefore, the energy is
[tex]E=\frac{(6.63\cdot 10^{-34} Js)(3\cdot 10^8 m/s)}{1.0\cdot 10^{-11} m}=2.0\cdot 10^{-14} J[/tex]
And keeping in mind that
[tex]1 eV = 1.6\cdot 10^{-19} J[/tex]
We find the energy in electron volts:
[tex]E=\frac{2.0\cdot 10^{-14}J}{1.6\cdot 10^{-19} J/eV}=1.25\cdot 10^5 eV[/tex]
What can cause the loss of soil that is not protected by plant cover?
Loss of soil not protected by plant cover can be caused by erosion, pollution, and overuse/improper farming practices.
Explanation:Loss of soil that is not protected by plant cover can be caused by various factors:
Erosion: Without plant cover to hold the soil in place, wind and water can easily carry away the top layer of soil, causing erosion.Pollution: Chemicals and pollutants can leach into the soil, making it less fertile and unsuitable for plant growth.Overuse and improper farming practices: Continuous farming on the same land without proper crop rotation or allowing the land to rest can deplete the nutrients in the soil, leading to its loss.Learn more about Causes of soil loss here:https://brainly.com/question/12535915
#SPJ3
The of the line on a velocity vs. time graph represents acceleration.
Answer:
The slope
Explanation:
The slope of the line on a velocity vs. time graph represents acceleration.Acceleration is the velocity made by a moving body per unit time. In other words is velocity per unit time. Acceleration is given by the formula;Acceleration = (final velocity -initial velocity)/time. This means acceleration depends on time taken to attain a given velocity and velocity of the moving body.The SI units of acceleration are; meters/square seconds(m/s²)Answer:
Slope
Explanation:
Which conditions are necessary for clouds to form?
Final answer:
Clouds form when water vapor condenses into tiny droplets that aggregate around small particles or nuclei and then fall as precipitation.
Explanation:
Clouds form under specific conditions. The necessary conditions for clouds to form include:
Rising air currents that carry water vapor into the atmosphereThe cooling of water vapor as it rises, causing it to condense into tiny droplets of liquid waterThe droplets reaching a certain size and aggregating around small particles or nucleiIf the droplets become large enough, they fall as precipitation, such as rain, snow, or hailThese processes are part of the water cycle, where water evaporates from the ocean, condenses in the atmosphere, and eventually falls back to the Earth as precipitation.
On the decibel scale, an increase of 10 decibels means an intensity increase of __________times?
Answer:
10
Explanation:
The decibel or decibel, is a unit that relates two values of sound pressure, and electrical power. the base unit is the bel, but given the amplitude but for practicality, a submultiple, the decibel, is used. It is a scalar expression .
Zero belios is the reference value used as a base, hence a bel is equivalent to 10 decibels and means that there is a power increase of 10 times over the reference value.
Which of the following is the best definition of light energy?
A.
The energy that travels as longitudinal pressure waves.
B.
The form of energy that travels as electromagnetic waves.
C.
The form of energy associated with the random motion of atoms or molecules within a substance.
D.
Energy that is stored in an object due to its position or configuration.
Answer:
B.
The form of energy that travels as electromagnetic waves.
Explanation:
Light energy, or electromagnetic field energy, is the form of energy that travels as electromagnetic waves. These waves do not need a medium through with to travel, so they are able to travel through the vacuum of outer space. Some types of light can be sensed by the human eye.
The best definition given is B: light energy is the form of energy that travels as electromagnetic waves, and this form of energy includes both wavelike behavior and particle-like characteristics as photons.
Explanation:The best definition of light energy among the given options is B. The form of energy that travels as electromagnetic waves.
Light energy is a form of electromagnetic radiation that moves through a vacuum at a constant speed of approximately 3 × 108 meters per second. This radiation exhibits wavelike behavior, which includes a frequency (v) and a wavelength (λ), adhering to the equation c = λv, where c represents the speed of light. Additionally, light can be described as a stream of particles called photons, capturing the dual nature of electromagnetic radiation as both waves and particles, a concept referred to as wave-particle duality.
Light energy is best defined as the form of energy that travels as electromagnetic waves. Light is an example of a transverse wave, where the oscillations occur in the electric and magnetic fields perpendicular to the direction of motion. It exhibits both wave-like and particle-like behavior, known as wave-particle duality, and can be described as a stream of particles called photons, with energy related to the frequency or wavelength of the light.
Kinetic energy and mass are
proportional.
kinetic energy and mass are dieectly proportional
Answer:
Kinetic energy and mass are directly proportional to each other
Explanation:
As we know by the formula of kinetic energy
[tex]KE = \frac{1}{2}mv^2[/tex]
now we know that
kinetic energy depends on the mass of object and it is product of mass and square of the speed.
Here we can say that if mass is doubled then kinetic energy also get double and if mass is decreased then kinetic energy also decreases
This type of relationship is known as direct relationship and here since it shows direct relationship so correct answer will be
Kinetic energy and mass are directly proportional to each other
does anyone know this???
Answer:
C
Explanation:
What is the length of the hypotenuse of a right triangle, whose legs have lengths of 12 meters and 35 meters?
Answer:
c
Explanation:
What does the diagram represent?
Answer:
this is a diagram illustrating the valance electrons on an oxygen atom
The diagram represents an oxygen atom Option A
An oxygen atom is a chemical element represented by the symbol "O" on the periodic table. It is classified as a non-metal and has an atomic number of 8, indicating the number of protons in its nucleus. The most common isotope of oxygen, found in nature, is oxygen-16, meaning it has 8 protons and 8 neutrons.
Oxygen is essential for life and is a crucial component of many compounds, including water (H2O) and various organic molecules. It plays a vital role in cellular respiration, the process by which living organisms extract energy from nutrients.
The electron configuration of an oxygen atom is 1s² 2s² 2p⁴, indicating the distribution of its eight electrons in different energy levels and orbitals.
Oxygen atoms tend to form covalent bonds with other atoms, sharing electrons to achieve a stable configuration. Molecular oxygen (O2) is a diatomic molecule, consisting of two oxygen atoms bonded together.
A trip is taken that passes through the following points in order
A(0m)
B(15m)
C(-30m)
D(-20m)
E(10m)
F(5m)
What is the distance from point B to point E
The distance from point B to point E is the sum of the absolute values of the differences in their positions, resulting in a total distance traveled of 65 meters.
The question is asking for the distance from point B to point E. Given the points A(0m), B(15m), C(-30m), D(-20m), and E(10m), we are interested in the segment from B to E. The distance traveled from B to E includes the change from B to D followed by the change from D to E. Specifically, the distance from B to D is the absolute value of the difference between their positions, which is |15 - (-20)| = 35 meters. Then from D to E, the distance is |(-20) - 10| = 30 meters. Therefore, the total distance traveled from point B to point E is 35 meters + 30 meters = 65 meters.
Which of the following chemical reactions expressed correctly the role of the catalyst in the reaction?
Answer:
d
Explanation:
because i know
Answer:
Explanation:
D
A catalyst starts out with the reactants and winds up with the products. It does not take any part of the reaction. It just lowers the activation energy (usually) making it easier to get from the left side of the equation to the right side.
B is the second best answer, and had you not chosen B and gotten wrong, I think I would have agreed with you.
metal cutters have long handles. why
Explanation:
To provide the leverage needed to produce enough force to overcome what you're trying to cut.
A ritualistic practice of clearing the mind in order to achieve relaxation and inner peace is known as ___________.
A.
hypnosis
B.
meditation
C.
sleep
D.
focus
Meditation is your answer
B. Meditation is correct
Which of the following is an example of a physical change but not a chemical change?
A) The log gives off heat and light as it burns
B) A tree stores energy from the sun in its fruit
C) A penny lost in the grass slowly changes color
D) A water pipe freezes and cracks on a cold night
A water pipe freezes and cracks on a cold night. (D)
There are three physical changes going on in this scenario:
1). The air gets cold and dark at night.
2). The water in the pipe freezes and expands.
3). The pipe cracks.
There are no chemical changes in the description.
Answer:
A water pipe freezes and cracks on a cold night
Explanation:
A water pipe freezing and cracking is a physical change, not a chemical change. A physical change is a change in what the item looks like, feels like, or how the item has a different form. The water pipe freezing is an example of a physical change because the liquid water has turned to frozen water. The frozen water has expanded the pipe, causing it to crack. There are no chemical changes taking place in this scenario.
Mordancy.
Simple question please help! A ball is thrown 19.0 m/s at an angle of 40.0º with the horizontal. Assume the ball is thrown at ground level 22.0 meters away. a. How long does it take the ball to reach the wall? b. At what height does the ball hit the wall?
a. 1.51 s
In this part of the problem, we are only interested in the horizontal motion of the ball. Along the horizontal direction, the motion of the ball is a uniform motion with constant velocity, which is equal to the horizontal component of the initial velocity:
[tex]v_x = v_0 cos \theta = (19.0 m/s)(cos 40^{\circ})=14.6 m/s[/tex]
So, the ball travels horizontally at a speed of 14.6 m/s; in order to cover the distance of d = 22.0 m that separates it from the wall, the time need is
[tex]t=\frac{d}{v_x}=\frac{22.0 m}{14.6 m/s}=1.51 s[/tex]
b. 7.25 m
We now know that the ball takes 1.51 s to hit the wall, 22.0 away. Now we have to analyze the vertical motion of the ball, which is an accelerated motion with constant acceleration g =9.8 m/s^2 towards the ground (acceleration due to gravity).
The initial vertical velocity is
[tex]v_{y0}=v_0 sin \theta=(19.0 m/s)(sin 40^{\circ})=12.2 m/s[/tex]
The vertical position of the ball at time t is given by the equation
[tex]y(t)=v_{0y} t -\frac{1}{2}gt^2[/tex]
We know that the ball hits the wall at t=1.51 s, so if we substitute this value into the previous formula, we find at what height y the ball hits the wall:
[tex]y(1.51 s)=(12.2 m/s)(1.51 s)-\frac{1}{2}(9.8 m/s^2)(1.51 s)^2=7.25 m[/tex]
why did scientist reject Lamarck's idea of evolution?
A. Organisms have not changed through earths history.
B. Organisms cannot change their characteristics during their life time.
C. Traits acquired during a lifetime are not passed through offspring.
D. Traits acquired during a lifetime are of no use to an individual.
Explanation:
Lamarck's theory of evolution, also called as theory of inheritance of acquired traits was rejected because he suggested that the acquired characteristics which an organisms acquires through its life experiences are transferred to its next generation, which is not possible since acquired characters does not bring any change to an individuals set of genes.
Answer: Traits acquired during a lifetime are not passed through offspring. (C.)
Objects 1 and 2 attract each other with a electrostatic force of 72.0 units. If the charge of Object 2 is tripled, then the new electrostatic force will be ____ units
Answer:
216.0 units
Explanation:
The electrostatic force between two charged objects is given by:
[tex]F=k\frac{q_1 q_2}{r^2}[/tex]
where
k is the Coulomb's constant
q1 and q2 are the two charges
r is the distance between the charges
In this problem, the charge of object 2 is tripled, so
[tex]q_2 ' = 3 q_2[/tex]
Substituting into the original equation,
[tex]F'=k\frac{q_1 (3 q_2)}{r^2}=3 (k\frac{q_1 q_2}{r^2})=3 F[/tex]
So, the electrostatic force will be tripled.
Since the initial electrostatic force is
F = 72.0 units
the new force will be
[tex]F' = 3 F = 3(72.0 )=216.0[/tex]
Answer:
216
Explanation:
In a longitudinal wave, particle displacement is
perpendicular to the direction of wave motion
parallel to the direction of wave motion
opposite to the direction of wave motion
above the direction of wave motion
In a longitudinal wave, particle displacement is parallel to the direction of wave motion.
(In a transverse wave, particle displacement is perpendicular to the direction of wave motion .)
Answer:
it is B
Explanation:
What is the downward pull on an object due to gravity?
Answer:
force of gravity
Explanation:
The force of gravity is that which draws the bodies towards the surface of the Earth.
The force of gravity brakes the objects that move up and accelerates those that move down. It causes a parabolic movement in what we throw upwards,
The download pull of an object due to gravity is the object's weight.
Explanation:
When an object is thrown upwards from a certain height, it goes to a certain distance and then due to a downward force experienced by the object from the ground, it makes it to fall towards the ground.
This downward force is called as acceleration due to gravity and the pull is being experienced due to object's weight.
How do you sound waves transfer energy
In electromagnetic waves, energy is transferred through vibrations of electric and magnetic fields. In sound waves, energy is transferred through vibration of air particles or particles of a solid through which the sound travels. In water waves, energy is transferred through the vibration of the water particles.
MARK ME BRAINLIEST PLEASE!!!!
Answer:
Sound waves transfer energy by causing successive compressions and rarefactions in the particles of the medium without transporting the medium particles themselves.
Explanation:
Sound in solids can also manifest as transverse waves, causing crests and troughs in the propagation medium. Waves can be characterized by two basic parameters: amplitude and frequency. Focusing on a single point vibrating in a medium excited by a sound wave, amplitude is the maximum distance traveled by the vibrating point relative to its rest position. Taking a snapshot of a propagating sound wave at any instance shows consecutive compressions and rarefactions, regions in which the medium material is compressed together and spread widely apart, respectively. The distance between the centers of two successive compressions or rarefactions is the wavelength of the wave. The frequency is the inverse of the wavelength, so the larger the frequency, the smaller the wavelength. Having a higher frequency makes the wave have a larger number of more closely-grouped compressions and rarefactions as it propagates. As the amplitude and frequency of the wave increase, the energy transferred by the propagation of the wave also increases. Extremely short but low-amplitude ultrasonic waves can be used to heat polymer materials and weld them together.