Answer:
its B
Explanation: i searched it up...
The Law of Triads, proposed by Johann Dobereiner, grouped elements into triads based on similar properties, with an example being the triad of lithium, sodium, and potassium. The correct answer is B: Elements were arranged in groups of three.
The Law of Triads was an early attempt to categorize elements based on their properties by grouping them in sets of three with similar characteristics. Answer to the student's question is B: Elements were arranged in groups of three. This concept was proposed by the German chemist Johann Dobereiner in 1829. Dobereiner noticed patterns among certain groups of three elements (triads) such as lithium, sodium, and potassium as well as chlorine, bromine, and iodine. He found that the atomic masses of the lightest and heaviest elements in a triad, when averaged, were close to the atomic mass of the middle element, and these triads also had similar chemical reactions. However, this system had limitations as it could not categorize all known elements. Today, we recognize that portions of the periodic table, particularly the d-block, have triads of elements with substantial similarities. The periodic table has since evolved to arrange elements in increasing order of atomic numbers, forming periods and groups that reflect periodic functions of their atomic numbers.
A ball is dropped from rest from a Cliff and falls for 3 seconds.
Neglecting air resistance, the final velocity of the ball is
m/s. (g = -9.8 m/s2)
Enter the answer
Answer:
-29.4 m/s
Explanation:
Given:
v₀ = 0 m/s
t = 3 s
a = -9.8 m/s²
Find: v
v = at + v₀
v = (-9.8 m/s²) (3 s) + (0 m/s)
v = -29.4 m/s
The final velocity of a ball dropped from rest for 3 seconds is -29.4 m/s.
How to find final velocity?Given the following information:
The ball is dropped from rest.
The acceleration due to gravity is g = -9.8 m/s².
The time the ball falls is t = 3 seconds.
Use the following formula to calculate the final velocity of the ball:
v = v_0 + g × t
where:
v is the final velocity of the ball
v_0 is the initial velocity of the ball (which is 0 in this case)
g is the acceleration due to gravity
t is the time
v = 0 + (-9.8 m/s²) × 3 seconds
v = -29.4 m/s
Therefore, the final velocity of the ball is -29.4 m/s.
The negative sign indicates that the velocity is downwards.
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A stationary speed gun emits a microwave beam at 2.10x10^10 Hz. It reflects off a car and returns 638 Hz lower. What is the speed of the car? (Unit=m/s)
Answer:
The answer is 4.55 m/s!
Explanation:
I wish you luck with Acellus! We got 15 days left!
Please mark brainliest.
The speed of the car will be approximately 9.14 meters per second.
To find the speed of the car, we can use the Doppler effect equation for frequency shift:
Δf/f₀ = v/c
where:
Δf = frequency shift (638 Hz lower in this case)
f₀ = original frequency emitted by the speed gun (2.10x10¹⁰ Hz)
v = velocity of the car
c = speed of light in a vacuum (approximately 3.00x10⁸ m/s)
We need to rearrange the equation to solve for the velocity (v) of the car:
v = Δf/f₀ × c
Now, let's plug in the values:
Δf = 638 Hz
f₀ = 2.10x10¹⁰ Hz
c = 3.00x10⁸ m/s
v = 638 Hz / 2.10x10¹⁰ Hz × 3.00x10⁸ m/s
Calculate the value:
v ≈ 9.14 m/s
So, the speed of the car is approximately 9.14 meters per second.
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A gene is
1. a change in a DNA sequence
2. the 2-letter code representing the alleles inherited from parents
3. a part of a chromosome that controls a particular trait, like eye color
4. a characteristic that is inherited, like eye color
Answer:
C - a part of a chromosome that controls a particular trait, like eye color
Explanation:
(if theres an option to pick two, i would pick C and D)
what is the equivalent resistance of the circuit?
Answer:
80Ω
Explanation:
Resistance in a series circuit (when one resistor is after another in the same line) is calculated with the following equation
Total resistance = R1 + R2 + R3...Rn
Substitute in your values and solve for total resistance
Total resistance = 60 + 20 = 80Ω
Answer:
80
Explanation:
An 11.98-gram sample of zinc metal is placed in a hot water bath and warmed to 78.4°C. It is then removed and placed into a Styrofoam cup containing 50.0 mL of room temperature water (T=27.0°C; density = 1.00 g/mL). The water warms to a temperature of 28.1°C. Determine the specific heat capacity of the zinc.
Answer:
383.34 J/kg.K
Explanation:
From the question,
Heat lost by zinc = heat gained by water in the Styrofoam cup.
c'm'(t₁-t₃) = cm(t₃-t₂).............. Equation 1
Where c' = specific heat capacity of zinc, m' = mass of zinc, t₁ = initial temperature of zinc, t₂ = initial temperature of water in the Styrofoam cup, t₃ = temperature of the mixture
Make c' the subject of the equation
c' = cm(t₃-t₂)/m'(t₁-t₃).............. Equation 2
given: m' = 11.98 g = 0.01198 kg, m = density of water×volume of water = (1×50) = 50 g = 0.05 kg, t₁ = 78.4°C, t₂ = 27°C, t₃ = 28.1°C
Constant: c = 4200 J/kg.K
Substitute these values into equation 2
c' = 0.05×4200(28.1-27)/[0.01198×(78.4-28.1)]
c' = 231/0.602594
c' = 383.34 J/kg.K
The three basic items to make an electromagnet are a source of current, conducting wire, and a metal _______.
Answer:
Metal core
Explanation:
Answer:
core
Explanation:
Jennifer and Janna are trying to figure out how to control the mouse problem in their horse barn. They have tried several types of traps baited with peanut butter with no luck. The girls decide that the problem might not be the type of trap; it might be the type of food. What is the BEST question for the girls to use on their next experiment?
Answer:
It is option A because girl notices that it is matter of food which depends.
Explanation:
Answer: Your answer would be C
Explanation: None of the traps work with peanut butter, the next step is to test each type of trap individually with different foods. Hope this helps :)
You poll students on whether they prefer hotdogs, chicken fingers, salad, or
spaghetti for lunch. Which graph would you use to show your results?
A. Bar graph
B. Line graph
C. Cumulative frequency graph
D. Histogram
SO
Answer:
A. Bar Graph
Explanation:
It is easier to see the data.
We would use A)Bar graph to show our results.
What is a bar graph?A bar graph can be described as a chart or a graphical representation of data, portions, or numbers the usage of bars or strips. Bar graphs are used to compare and evaluate numbers, frequencies, or different measures of wonderful categories of statistics.
What are the types of bar graphs?vertical, horizontal, double, multiple, stacked,bar-line bar graphs.Learn more about Bar graphs here: https://brainly.com/question/24741444
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ANSWER ASAP PLEASE
Which phenomenon occurs when a wave encounters a non–transmitting barrier?
A.
refraction of the wave with a different wave speed
B.
reflection of the wave with a different wavelength
C.
reflection of the wave with the same wave speed
D.
refraction of the wave with a different wavelength
Answer:
C. reflection of the wave with the same wave speed
If a race car is traveling South due to a 30N force and the parachute deploys resulting in a 10N force North what is the Net Force (or Resultant Force)?
a) 40n east
b) 40n south
c) 10n west
d) 20n south
Answer:
F = 20 N south
Explanation:
It is given that,
Force applied on the racing car in south direction is 30 N and parachute deploys resulting in a 10 N force due North.
We need to find the net force on the car.
Let North denotes +y axis and South denotes -y axis.
So, F₁ = +10 N
F₂ = -30 N
Net force is :
[tex]F=F_1+F_2\\\\F=10+(-30)\\\\F=-20\ N[/tex]
It means that the net force is 20 N and it is acting in south. Hence (d) is correct.
PLEASE HELP ME!!! the equations are around the question itself.
Why has the study of genetic differences in intelligence been so controversial?
A.
Genetics has no role in intelligence.
B.
The studies didn’t really measure differences in genetics.
C.
The idea of genetic differences has often been used to justify racial discrimination.
D.
All of the above
The controversy over genetic differences in intelligence primarily relates to the misuse of genetic arguments for racial discrimination and the oversight of environmental influences on intelligence.
Explanation:The study of genetic differences in intelligence has been controversial due to several factors. The primary concern arises from the historical use of genetic arguments to justify racial discrimination. These views, although scientifically refuted, have at times resurged, as in the case of 'The Bell Curve'. Notably, the controversy arises from interpretations that link genetics and race with intelligence without accounting for the significant influence of environmental variables. Additionally, research has shown a closing of IQ gaps with increased access to education, pointing to nurture's critical role in intelligence development. The persistence of the idea that intelligence could be predetermined by race without adequate consideration of environment and socioeconomic factors contributes to the ongoing debate.
Moreover, there is a recognition that intelligence is affected both by genetics and environment, with environmental influences shaping the manifestation of cognitive abilities. Twin studies show a genetic component to intelligence, but conflict theorists note that IQ tests can be biased and do not always offer a fair assessment of a person's intellectual capabilities, reinforcing the complex interplay of genetics, environment, and social factors in the development of intelligence.
Which of the following explains the process of radiation? Question 3 options: when heat gets transferred through objects that are touching when the measurement of heat in the atmosphere goes down when heat gets transferred through electromagnetic waves that move through space when heat gets transferred through a liquid or a gas
Answer:
the answer is when heat gets transfered through objects that are touching when the measurement of heat in the yeans
Explanation:
The Option that explains the process of radiation is : ( C ) when heat gets transferred through electromagnetic waves that move through space
Radiation is the transfer of energy through space in the form of electromagnetic waves or as subatomic particles. Energies transferred during radiation move at the speed of light.
During conduction and convection heat gets transferred through objects that touch each other while during radiation the objects do not have to be in contact for energy to be transferred.
Hence we can conclude that The Option that explains the process of radiation is when heat gets transferred through electromagnetic waves that move through space
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It is important to wear protective equipment in both practice and games.
Please select the best answer from the choices provided.
OT
OF
Answer:
OT
It is important to wear protective equipments during games and practices.
Explanation:
Practice is a review of what is about to happen in some time to come and with practice ,the future can be trusted.
During practice it is very important to use protective gears or equipments because without them, injuries and accidents are liable to occur.
During the major game it is also important to prevent accidents or big injuries as the equipments protect each vital part of the body.
Answer:
The answer is True
Explanation:
Hope this helps you
lake water flows downward through tunnels
Answer:
what's your question?
This was a project I had to do. What do you think of it?
Answer:
looks nice, it must of taken months of practice! Great job!
Why is permeable soil best for plants that need a lot of drainage? Water fills this type of soil. Water dries up in this type of soil. Water flows through this type of soil. Water pools on top of this type of soil.
Answer:
Water flows through this type of soil.
Explanation:
By definition permeable soil is soil which water and other fluid flow easily through (like sand) If a plant needs drainage the soil will need to flow through the soil easily.
Two boats are anchored in the harbor, separated by a horizontal distance of 18 m. The boats bob up and down as waves enter the harbor. When one boat is at its highest point, the other is at its lowest point and there is one wave crests between them. Each boat makes exactly 2 complete up-and-down cycles every 16.0 s. The vertical distance between a boat's highest and lowest position is 3.6 m.
Final answer:
The amplitude of a wave is half the height from peak to trough, so a 2 m crest above still water has an amplitude of 1 m. A seagull bobbing every 2 seconds between 3 m apart crests experiences a wave velocity of 1.5 m/s. A boat hit by a 2 m high wave peak will change elevation by 2 m.
Explanation:
The question provided is related to the physics of waves, specifically their propagation, amplitude, frequency, and wavelength. When discussing a wave crest measuring 2 m above the still water mark, the amplitude of the wave is actually 1 m, as the amplitude corresponds to the maximum displacement from the equilibrium (still water level) to the peak of the wave, which would be half of the peak-to-trough height.
Therefore, if a wave's crest is 2 m above the still water mark, and assuming the trough is the same distance below, the amplitude is 1 m.
Similarly, for a seagull bobbing up and down on the water's surface, if it does so once every two seconds and the distance between two crests of the water wave is 3 m, the velocity of the wave would be 1.5 m/s (wavelength divided by the period: 3 m / 2 s = 1.5 m/s).
Regarding a boat that bobs up and down due to wave action, if the height of the wave is 2 m, the boat's height will change by 2 m when hit by the peak of the wave, considering the change from the equilibrium position to the peak.
What is a mixture of sugar and water? a solution molecule a compound a precipitate
Answer:
A solution
Explanation:
Sugar (solute) is soluble in water and would dissolve into the water (the solvent) to form a solution.
Wood burning is a chemical reaction. However, wood does not just spontaneously catch on fire. It needs ____________ to begin the chemical reaction.
A) Chemical Energy
B) Physical Energy
C) Electron Energy
D) Activation Energy
Answer:
A chemical energy
Explanation:
This is the answer
Definition: This is a solution that will hold no more solute
Answer:
Supersaturated Solution (im not sure what your question was but if you're looking for the term of the definition then it should be supersaturated solution)
Explanation:
If one wave of 10 m amplitude meets constructively with another of amplitude 20
m, what is the new amplitude?
20 m
30 m
200 m
10 m
Answer:
B. 30m
Explanation:
This is because when a wave interferes constructively with another wave, they will add since constructive relates to joining or building up.
So, 10m + 20m equals a 30m wave.
Please I need help on this please
Answer: all except 3, 5, and 6
Explanation: these 3 options are all positive effects. fewer extinctions would mean fewer loss of animal life, and a decrease in mining and water pollution would be less harmful to the environment
it’s all of them but not 3,5, and 6.
True or False: when measuring speed the distance must be considered to be rectilinear (in a line)
Answer:
I'm pretty sure it's False
Answer:
I dont know if I'm correct but I have to go with False
Explanation:
What type of energy is used by your body when you eat food?
Answer:
Chemical energy
Explanation:
Answer:
Chemical Energy
Explanation:
If the mass of Mars is 0.11 ME (mass of Earth) and its radius is 0.53 RE (radius of
Earth), How much is the gravitational field g at the surface of Mars?
Given: ME=6.0x1024 kg and RE=6.4x106m
Answer:
3.8 m/s²
Explanation:
g = GM / R²
g = G (0.11 ME) / (0.53 RE)²
g = 0.39 G ME / RE²
g = 0.39 (9.8 m/s²)
g = 3.8 m/s²
Answer:
vote me brainliest! Please!
simple put is 3.8 m/s²
took it on edge 2020
A point charge Q = -400 nC and two unknown point charges, q1 and q2, are placed as shown. Point charge q1 is located 1.3 meters along the +x-axis, point charge q2 is located 0.7 meters down the -y-axis, and point charge Q is located 2.0 meters from the origin at an angle of 30° above the x-axis. At the origin, the three charges together create an electric field that has magnitude zero. What is the charge q1?
150 nC
120 nC
–120 nC
–150 nC
250 nC
To find the charge q1, set up equations for the electric fields created by each charge and solve them simultaneously. The value of q1 is -150 nC.
Explanation:To find the charge q1, we need to consider the electric field created by each of the three charges separately. Since the total electric field at the origin is zero, the electric fields from charges Q, q1, and q2 must sum up to zero.
We can use the formula for the electric field due to a point charge, which is given by E = k * Q / r^2, where k is the electrostatic constant, Q is the charge, and r is the distance from the charge to the point of interest. By setting up equations for the electric fields from each charge and solving them simultaneously, we can find the value of q1.
After solving the equations, we find that the charge q1 is equal to -150 nC.
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Explain why sound energy is not a type of potential energy.
A. It does not depend on the position or configuration of the system.
B. It does not depend on the mass of the system.
C. It does not depend on the age of the system.
D. It does not depend on the temperature of the system.
Answer:
A
Explanation:
Which expressions correctly represent variations of Ohm's law? Check all that apply.
Answer:
V = IR
R = V/I
I = V/R
Explanation:
PLEASE HELP
Matilda pushes her bike with a force of 5 Newtons. If she increases her force to 6 Newtons, her bike will —
not change its acceleration
accelerate more quickly
accelerate more slowly
Answer:
c
Explanation: