Answer:
231-91Pa>4-2a+227-89Ac
Explanation:
hope this helps
The equation for the alpha decay of [tex]^{231} _{91}Pa[/tex] is written as [tex]^{231}_{91}Pa\ ---> \ ^4_2\alpha \ + \ ^{227} _{89}Ac[/tex].
Alpha decay is a type of radioactive decay in which an atomic nucleus emits an alpha particle.
The emission of this alpha particle reduces the mass number of the original atom by 4 and the atomic number by 2.
The alpha decay equation is written as;
[tex]^a_zX\ ---> \ ^4_2\alpha \ + \ ^{a-4} _{z-2}Y[/tex]
When the given atom ([tex]^{231} _{91}Pa[/tex]) under goes alpha decay, the resulting element is written using the following equation;
[tex]^{231}_{91}Pa\ ---> \ ^4_2\alpha \ + \ ^{227} _{89}Ac[/tex]
Thus, the equation for the alpha decay of [tex]^{231} _{91}Pa[/tex] is written as [tex]^{231}_{91}Pa\ ---> \ ^4_2\alpha \ + \ ^{227} _{89}Ac[/tex].
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What do the sounds of a basketball bouncing and a dog barking have in common?
A.Both require a medium to travel through.
B.Both require a human eardrum in order to be
heard.
C.Both have the same amplitude.
D.Both have the same frequency.
Answer:
I think that the answer is B
In which situation will the lowest resistance occur?
A. thick wire and high temperature
B. thin wire and high temperature
C.thick wire and cold temperature
D.thin wire and low temperature
C. Thick wire and cold temperature.
Explanation:
The resistance of a wire is given by: R = (ρL)/A
where ρ is the resistivity of the material, L is the length of the wire, A is the cross-sectional area of the wire.
From the formula, we see that the thicker the wire, the larger A, therefore the smaller the resistivity. so, a thick wire will have lower resistivity.
Moreover, the resistance of a wire increases with the temperature. In fact, high temperatures mean more motion of the atoms/electrons inside the wire, so more resistance to the flow of current through it. Therefore, colder temperature means lower resistance.
So, the correct option is thick wire and cold temperature.
Answer:
C. Thick wire and cold temperature.
Explanation:
When the energy of a sound wave is transferred to a particle of a medium and causes it to vibrate and generate heat the sound wave is
A. Reflected
B. Refracted
C. Absorbed
D. Transmitted
_____ is the frictional force needed to slow down an object in motion
Answer
gravity
Explanation:
Ocean waves are hitting a beach at a rate of 3.5 Hz. What is the period of the waves?
Answer:
a body is projected harizontally with a velocity of 25m/ s of a tower for high caculate 1 the time of flight 2 the harizontal range 3 the velocity with which it lit the ground
Which countries have high productivity, but are not among the top 10 for human development? Check all that apply.
Australia
France
Singapore
Canada
Belgium
Luxembourg
Iceland
Answer:
Belgium
France
Luxembourg
Explanation:
These are the ones that are in the High Productivity chart, but not in the HDI chart
The countries have high productivity, but are not among the top 10 for human development are Belgium, France and Luxembourg.
What is productivity?
Productivity is the making the maximum use of any product or time or machine.
The ones that have high productivity, but not in the human development chart are Belgium, France and Luxembourg.
The productivity is also achieved by the humans, but what if human is not developing.
Productivity and human development must be on the same balance for any country.
Thus, correct options are Belgium, France and Luxembourg.
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Sound waves are a type of __________ wave.
The energy in a battery is_____energy
O A. kinetic
O B. potential
OC. mechanical
OD. nuclear
Answer:
A charged battery that is NOT part of a circuit is an example of potential energy.
a ball slows down as it rolls up hill this is an example of? neutral motion, relative velocity, positive acceleratio, negative acceleration
Answer: negative acceleration
Explanation:
Acceleration is speeding up, the ball is slowing down making it negative acceleration
Answer:
4th option
Explanation:
When a candle is lit, the wick burns, the wax melts, the candle changes shape, and the air
around the candle heats up. Which of the following is an example of a chemical change?
A. the wick burning
B. the wax melting
C. the candle changing shape
D. the air around the candle heating up
An example of the change in the chemical is option a. the wick burning.
What is a chemical change?A chemical change occurs at the time when the one chemical substance should be converted into one or more distinct substances like iron becoming rust.
It should arise via the chemical reaction process and the substance should contain different kind of properties since it contains the atoms and molecules are arranged in the different manner.
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A 25 kg rock falls for 2.7 seconds. How many meters tall was the
building?
Assume no air resistance, answer using two place values
Answer:
35.72 m
Explanation:
Given:
v₀ = 0 m/s
a = 9.8 m/s²
t = 2.7 s
Find: Δx
Δx = v₀ t + ½ at²
Δx = (0 m/s) (2.7 s) + ½ (9.8 m/s²) (2.7 s)²
Δx = 35.72 m
Help please! Will give brainliest!!!
The pH scale is actually measuring the concentration of H+ ions in a solution. If there is a high concentration of H+ ions, then the pH of the solution will be
A. neutral
B. low
C. none of the above
D. high
In a grassland ecosystem, praying mantises catch and eat grasshoppers. However, there has been a significant decrease in the praying mantis population in recent years. How will this most likely affect the grasshopper population over time? The population will decrease because grasshoppers are the competition. The population will increase because grasshoppers are the prey. The population will increase because grasshoppers are the competition. The population will decrease because grasshoppers are the prey.
Answer:
The population will increase because grasshoppers are the prey.
Explanation:
If there has been a significant decrease in the praying mantis population in recent years. This most likely affect the grasshopper population over time by the population will increase because grasshoppers are the prey. If there is less praying mantis then grasshoppers won't be eaten as much so the population of the grasshoppers will thrive
Answer:
The population will increase because grasshoppers are the prey.
Explanation:
From the picture above, please list 3 long-term and 3 short-term impacts this natural disaster
would have in your community.
Answer:
Long terms:
-earth its self
-economy (money)
-death
Short term:
- dirty
-damage houses
- roofing
-electricity
Explanation:
WILL GIVE BRAINLIEST The table below shows the orbital speed of four planets. Name of Planet Average orbital speed (km/s) Planet J 13.07 Planet E 29.78 Planet Y 47.36 Planet M 24.00 Considering Keplers Laws, which planet is likely closer to the sun? Planet J Planet E Planet Y Planet M
Answer:
planet y
Explanation:
Answer:
y
Explanation:
Most of the volume (space occupied) of the atom is found in...
A: Nucleus
B: Electron Cloud
C: Nucleus and electron cloud have equal volumes
(Please help me I’m dying)
Kinetic Energy - What does it depend on?
Kinetic energy depends on both ___________________________.
Help!
Answer:
kinetic energy depends on both positive and negative energy
Explanation:
Answer:
Kinetic energy depends on both speed and time
What is Newton's law of universal gravitation?
Answer: Newton's law of universal gravitation is usually stated that every particle attracts every other particle in the universe with a force which is directly proportional to the product of their masses and inversely proportional to the square of the distance between their centers
Answer:
Newton’s law of gravitation, statement that any particle of matter in the universe attracts any other with a force varying directly as the product of the masses and inversely as the square of the distance between them.
As the car moves from point A , to point B, and finally to point C, the total energy of the car
A. decreases from point A to point B, then increases from point B to point C
B. increases from point A to point B, then decreases from point B to point C
C. stays the same, but is converted between potential and kinetic energy
D. is lost between points B and C
Answer: C
Explanation:
Energy stays the same, but there’s more kinetic energy the less it moves and mor kinetic energy the more it moves
The conservation of energy allows us to find the correct answer for how the change in mechanical energy is:
C. stays the same, but is converted between potential and kinetic energy.
The mechanical energy of bodies is the sum of the kinetic energy due to motion and the potential energies due to the configuration of the system.
If there is not friction in the system, that is, there are no dissipative forces, the mechanical energy must be conserved at all points, this is one of the important conservation laws of physics.
When applying this theorem to the case of the car moving, the energy is converted from potential to kinetic, on the path from A to B and is transformed from kinetic to potential on the path from B to C, but the total value of the mechanical energy remains constant.
Let's analyze the different claims:
A. False. The stable energy conservation theorem that must be constant at all points.
B. False. Must be constant.
C. True. According to the analysis, the mechanical energy is constant and transforms between potential and kinetic.
D. False. As there is no friction, the energy is not lost.
In conclusion using the conservation of energy we can find the correct answer for the transformation of mechanical energy is:
C. Stays the same, but is converted between potential and kinetic energy.
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Economic growth as measured by gross domestic product does not really tell us much about citizens' general well-being. Consider the situations described here. All BUT ONE describes the results of economic growth and how it may possibly have a negative influence on citizens overall well bring.
A) Commuters traveling to work as well as traffic jams may increase as more people are driving to their jobs.
Eliminate
B) Appropriate housing for all citizens within the country, thereby reducing the number of homeless people living on the streets.
C) Increased need for food results in the growth of the agricultural industry and an increased use of pesticides and herbicides to produce food crops.
D) In North Dakota. the economy has doubled in the past 25 years thanks to the oil boom. Incomes have risen, but so have prices, traffic, crime, and housing shortages.
Answer:
b
i remember this question from when i had a test to take.
Identify the number of atoms on the reactant side of the chemical equation.
Fe2O3 + 3H2 → 2Fe + 3H2O
There are blank Fe (iron) atoms.
There are blank O (oxygen) atoms.
There are blank H (hydrogen) atoms.
Answer:
The Correct Answer is: 2,3,and 6
Explanation:
There are
2
Fe (iron) atoms.
There are
3
O (oxygen) atoms.
There are
6
H (hydrogen) atoms.
Answer:
the photo says all da answers
**20points**
When this chemical reaction occurs, the product is
A) a salt called lithium fluoride.
B) a new element is formed
C) the replacement of one element by another.
D) the decomposition of two elements, lithium and fluorine.
What’s is inductive reasoning?
Answer:
got this on google and got it right
Explanation:
An example of inductive logic is, "The coin I pulled from the bag is a penny. ... Even if all of the premises are true in a statement, inductive reasoning allows for the conclusion to be false. Here's an example: "Harold is a grandfather. Harold is bald.
Inductive reasoning is when someone observes data, recognizes patterns within these observations, and then draws a conclusion on these observations that they found.
Let's look at an example.
A 12-oz. coke bottle exploded after an hour in the freezer.
A second 12-oz. coke bottle exploded after an hour in the freezer.
The reasoning that was used here was inductive reasoning.
Although we might want to test a few more 12-oz. coke bottles, we can tentatively conclude that all 12-oz. coke bottles will explode after an hour in the freezer.
Since were using oneservations and recognizing patterns to draw a
conclusion, our conclusion is based on inductive reasoning.
Can you solve it descriptively . thanks
static question
If the applied load F causes Mx
(-77 N.mm) and Mz
(-81 N.mm) at origin then
determine the My
at origin where d=27 mm
Answer:
[tex]|M_y| = 170.82 \ N.mm[/tex]
Explanation:
From the diagram affixed below completes the question
Now from the diagram; We need to resolve the force at point A into (3) components ; i.e x.y. & z directions which are equivalent to [tex]F_x \ , F_y \ , F_z[/tex]
So;
[tex]F_x[/tex] = positive x axis
[tex]F_y =[/tex] Negative y axis
[tex]F_z[/tex] = positive z axis
Then;
[tex]|M_x| = F_y *27-F_z*11 = 77 ----- equation(1) \\ \\ |M_z| = F_y*4 - F_x*11 = 81 ---- equation (2) \\ \\ |M_y| = F_x *27 - F_z *4 = ? ---- equation (3)[/tex]
From equation (1); Let's make [tex]F_y[/tex] the subject of the formula ; then :
[tex]F_y = \frac{77+11F_z}{27}[/tex]
Substituting the value for [tex]F_y[/tex] into equation (2) ; we have:
[tex](\frac{77+11F_z}{27})4-F_x*11=81 \\ \\ 11(\frac{7+F_z}{27} ) 4- F_x -11 =81 \\ \\ 28+4 F_z - 27F_x = \frac{81*27}{11} \\ \\ 4F_z - 27F_x = 198.82 -28 \\ \\ 4F_z - 27F_x = 170.82 \\ \\ Since \ |M_y| = 4F_z-27F_x \\ \\ Then: \\ \\ \\ |M_y| = 170.82 \ N.mm[/tex]
Differences in temperatures, the rotation of the earth, and the amount of water in the atmosphere
Answer:
I think the answer is the Earth's weather and climate system represent complex. Hope it helps!
An object with a mass of 5.0 kg accelerates 8.0 m/s^2 when an unknown force is applied to it. What is the acceleration? (20 points)
Answer:
40N
Explanation:
F=ma
F= 5 × 8 = 40N
.......
Which of the following is a field force
Answer:
magnetic, gravity, electrostatic all are field forces
Explanation:
help this help! :)
Among the options provided, both magnetic force and electric force are examples of field forces. Thus, option 1 and 2 is correct.
Explanation:Magnetic force arises due to the interaction between moving charges or magnetic dipoles in a magnetic field. It is responsible for phenomena such as the attraction or repulsion between magnets, the operation of electric motors, and the behavior of charged particles moving through magnetic fields. Magnetic fields are produced by moving charges or currents, creating a force that acts on other moving charges within the field.
Electric force, similarly, arises from the interaction between charged particles within an electric field. This force is responsible for the attraction or repulsion between charged objects, the operation of devices like capacitors, and the behavior of charged particles in electric fields. Electric fields are created by static charges or changing magnetic fields, exerting a force on other charged particles within the field.
Both magnetic and electric forces are examples of field forces because they are transmitted through fields (magnetic or electric fields, respectively) and act at a distance without direct contact between the interacting objects. Conversely, normal force and gravitational force are contact forces, as they require physical contact between objects to manifest.
What are supersonic speeds?
speeds at 343 m/s exactly
speeds above 343 m/s
speeds below 343 m/s
speeds exactly at the speed of sound
The answer is: B.
speeds above 343 m/s.
:)
Supersonic speeds is speed which is above 343. Hence option B is correct.
What is Speed ?Speed is a rate of change of distance with respect to time. i.e. v=dx÷dt. Speed can also be defined as distance over time i.e. speed= distance ÷ time. It is denoted by v and its SI unit is m/s. it is a scalar quantity. Speed shows how much distance can be traveled in unit time.
To find dimension for speed is,
from formula Speed = Distance ÷ Time
Dimension for distance is [L¹] ,
Dimension for Time is [T¹],
Dividing dimension of distance by dimension of time gives,
[L¹] ÷ [T¹] = [L¹T⁻¹]
Dimension for speed is [L¹T⁻¹].
Supersonic speed is the speed of an object that is above the speed of sound. For objects traveling in dry air of a temperature of 20 °C. Speed of the sound is 343 m/s in dry air.
Hence Option B is correct.
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Which of these statements accurately describe uses of ultrasound technology? Check all that apply.
It is unsafe to use for industrial applications.
It can be used to clean small items like jewelry.
It can be used to clean large items like machinery.
It increases the production time of everyday materials.
It cannot be used in the presence of liquids like water.
It can be used to clean small items like jewelry
It can be used to clean large items like machinery
Statements 2 and 3 accurately describe the uses of ultrasound technology.
It is a widely used technology in all fields.
What is ultrasound technology?
Diagnostic ultrasonography, commonly known as sonography is an imaging technique that produces pictures of inside body structures using high-frequency sound waves.
The pictures can aid in the diagnosis and treatment of a wide range of illnesses and ailments.
The ultrasound wave helps in the following applications;
1. It can be used to clean small items like jewelry.
2. It can be used to clean large items like machinery.
Hence statements 2 and 3 accurately describe the uses of ultrasound technology.
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Hi:) I really need help with this, I’m so confused! :/
Metals tend to lose electrons to achieve a stable noble gas electronic configuration.
Do metals lose electrons to other metals
OR
Do metals lose electrons to non metals
Non-metals tend to gain electrons to achieve a stable noble gas electronic configuration
Do non metals gain electrons from other non- metals
OR
Do non-metals gain electrons from metals?