If the half-life of a radioactive sample is 22 years, it will take 73.11 years for the sample to decay to 10%.
How is half-life used to calculate radioactive decay?A fixed percentage of activity is lost during radioactive decay per unit of time. Half-life: The amount of time needed for a sample to degrade to 50% of its starting state. 1/2 = e –(λ*T1/2). constant over time and unique to each nuclide.
Do longer half-lives imply a lower radioactivity?The term (physical) half-life refers to the amount of time needed for radioactivity to decline and split in half. Half of the radioactivity will remain after a period of time equal to the half-life has passed, and a further half of the radioactivity will remain after a period of time twice as long as the half-life has passed.
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A train is uniformly slowed down from 35m/s to 21m/s over a distance of
350m. Calculate the acceleration and the time taken to come to rest from the 35m/s.
✴ A train is uniformly slowed down from 35m/s to 21m/s over a distance of 350m. Calculate the acceleration and the time taken to come to rest from the 35m/s.
✒ The acceleration is - 1.12 ms-² and the time taken to come to rest from the 35m/s is 31.3 seconds .
Given :-
A train is uniformly slowed down from 35m/s to 21m/s over a distance of 350m.
To Find :-
Calculate the acceleration and the time taken to come to rest from the 35m/s.
Calculation :-
According to the question,
Initial velocity ( u ) = 35 m/s
Final velocity ( v ) = 21 m/s
Displacement ( s ) = 350 meters
♠ A train is uniformly slowed down from 35m/s to 21m/s over a distance of 350m.
From the equation of motion ,
↗ v² - u² = 2as
➡ ( 21 )² - ( 35 )² = 2 x a x 350
➡ 441 - 1225 = 2 x a x 350
➡ - 784 = 700 x a
➡ - 784 = 700a
➡ 700a = - 784
➡ a = -784/700
➡ a = - 1.12 ms-²
So, The Acceleration of the train is - 1.12 ms-².
Initial velocity ( u ) = 35 m/s
Acceleration ( a ) = - 1.12 m/s²
Final velocity ( v ) = 0 m/s
From, the equation of motion ;
↗ v = u + at
➡ 0 = 35 + ( - 1.12 x t )
➡ 0 = 35 + ( - 1.12t )
➡ 0 - 35 = - 1.12t
➡ - 35 = - 1.12t
➡ t = 35/1.12
➡ t = 3500/112
➡ t = 31.3 seconds
The time taken to come to rest from the 35m/sis 31.3seconds.
How much force is necessary to stretch a spring 0. 5 m when the spring constant is 190 N/m? N.
Statement:
A force is necessary to stretch a spring 0.5 m when the spring constant is 190 N/m.
To find out:
The force required to stretch the spring.
Solution:
Spring constant (k) = 190 N/m.Displacement (x) = 0.5 mLet the force necessary to stretch the spring be F.We know the formula of spring force, i.e., F = kx.Putting the values in the above formula, we getF = 190 N/m × 0.5 mor, F = 95 NSo, the force required to stretch the spring is 95 N.Answer:
95 N
Hope you could understand.
If you have any query, feel free to ask.
In bright light, the iris __________ and the pupil __________ to control the amount of light entering the eye.
In bright light, the iris constricts and the pupil shrinks to control the amount of light entering the eye.
In bright light, the iris constricts and the pupil shrinks to control the amount of light entering the eye.
The iris is the colored part of the eye surrounding the pupil. It contains muscles that can adjust the size of the pupil. When exposed to bright light, the muscles in the iris contract, causing the pupil to constrict or become smaller in size.
By constricting the pupil, less light is allowed to enter the eye. This helps to protect the sensitive structures within the eye from excessive light intensity, preventing potential damage. It also helps to improve the clarity and sharpness of vision by reducing the amount of light scattering in the eye.
On the other hand, in dim light conditions, the iris relaxes its muscles, allowing the pupil to dilate or expand. This allows more light to enter the eye, maximizing the amount of available light for vision in low-light situations.
So, in bright light, the iris constricts and the pupil shrinks to control the amount of light entering the eye, while in dim light, the iris relaxes and the pupil dilates to allow more light to enter.
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if a mechanic pushes A (0.1M2) with a force of 200N, what will be the pressure? Show your working
Answer:
Explanation:
Given:
A = 0.1 m²
F = 200 N
_________
p - ?
Pressure:
p = F / A
p = 200 / 0.1 = 2 000 Pa
Which of the following will increase if the voltage in a circuit is increased?
Check all that apply.
A. Heat produced by the circuit
B. Magnetic force
C. Resistance
D. Current
Answer:
D. Current
I hope this helps
how long does it take for photons to emerge from the sun's core to the outside
It takes around 100,000 years for photons to emerge from the Sun's core to the outside.
Photons are the elementary particles that make up light. In the Sun's core, nuclear fusion reactions produce high-energy photons, which are continually absorbed and re-emitted by the atoms in the dense plasma. These photons interact with other particles in the plasma, making their journey to the surface a slow and indirect process.
It takes a photon around 100,000 years to travel from the Sun's core to the outside. This is due to the high density and opacity of the Sun's interior, which causes the photons to undergo a random walk through the plasma, bouncing off atoms and being absorbed and re-emitted many times before they finally reach the surface. Once the photons reach the surface, they can escape into space and travel to Earth in just over 8 minutes. The process of photons escaping from the Sun's core and eventually reaching Earth is a crucial part of the solar energy that sustains life on our planet.
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Bài 1. Một chiếc xe trong 2 giờ đầu xe đi được quãng đường 40 km, trong 3 giờ tiếp theo xe đi được quãng đường 90 km. Tính tốc độ của xe trên cả quãng đường.
Answer:
sorry I don't understand
Explanation:
please translate it in english
Which state helps produce light in fluorescent lightbulbs?
A.
Solid
B.
Plasma
C.
Gas
D.
Liquid
: (a) A cosmic-ray proton in interstellar space has an energy of 13. 0 MeV and executes a circular orbit having a radius equal to that of Mars' orbit around the Sun (2. 28 x 10¹¹ m). What is the magnetic field (in T) in that region of space? (b) What If? The cosmic ray proton enters our solar system where the interplanetary magnetic field has a magnitude of 5. 00 m and is perpendicular to the velocity of the proton. What is the radius (in m) of the proton's circular orbit in this field?
We can use the formula for the centripetal force experienced by a charged particle moving in a magnetic field and when the cosmic ray proton enters our solar system, it experiences an interplanetary magnetic field that is perpendicular to its velocity.
(a) To find the magnetic field in the region of space where the cosmic-ray proton is executing a circular orbit, we can use the formula for the centripetal force experienced by a charged particle moving in a magnetic field. The centripetal force is given by the equation:
F = qvB
Where:
F is the centripetal force,
q is the charge of the particle (in this case, the charge of a proton),
v is the velocity of the particle,
B is the magnetic field strength.
The centripetal force can also be expressed as:
F = mv²/r
Where:
m is the mass of the proton,
v is the velocity of the proton,
r is the radius of the circular orbit.
Equating the two expressions for the centripetal force, we have:
qvB = mv²/r
Rearranging the equation, we can solve for the magnetic field B:
B = mv/rq
Given the energy of the proton (13.0 MeV), we can use the relation between energy and velocity for a particle with rest mass m:
E = mc² = (γ - 1)mc²
Where:
E is the energy of the particle,
m is the rest mass of the particle,
c is the speed of light,
γ is the Lorentz factor.
The Lorentz factor can be expressed as:
γ = E/mc² + 1
Substituting the given energy and rest mass of the proton, we can calculate the Lorentz factor.
Now, we can substitute the values of m, v, and r into the equation for the magnetic field B and solve for B.
(b) When the cosmic ray proton enters our solar system, it experiences an interplanetary magnetic field that is perpendicular to its velocity. In this case, the proton will follow a helical path in the magnetic field.
To find the radius of the proton's circular orbit in this field, we can use the formula for the radius of a helical path in a magnetic field:
r = mv/|q|B
Where:
m is the mass of the proton,
v is the velocity of the proton,
|q| is the magnitude of the charge of the proton,
B is the magnitude of the magnetic field strength.
Substituting the given values of m, v, and B into the equation, we can calculate the radius of the proton's circular orbit in this field.
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which statement describes the effects of forces on an object
Answer:
Sorry this isn’t going to be any help. You don’t have any statement that I’m able to see.
Explanation:
I will give Brainliest to WHoever answers truthfully!!!!!T/F net force charge and net electric force are the same thing
Answer:
it's true I'm pretty sure
Answer:
the answer is true.I'm sure
In a study of momentum during collisions, a student threw an egg at a large sheet of cloth that was suspended from a line and observed that the egg did not break during the collision. A second egg, thrown with similar force at a suspended concrete block, did break on impact. Why did the first egg survive the collision while the second egg did not survive?.
From the law of conservation of momentum, the first egg did not break because it forward momentum is transferred to the cloth while the second egg broke, the block exerts an opposite force equal to the momentum of the egg on the egg.
MomentumMomentum is the product of the mass of an object and its velocity of motion.
The law of conservation of momentum states that the momentum of an isolated system of colliding bodies is conserved.
When an egg is thrown on a large sheet of cloth suspended, the egg does not break because the momentum of the egg is transferred to the cloth as it is depressed.
However, a second egg, thrown with similar force at a suspended concrete block, did break on impact because the block does not move forward, instead it exerts an equal but opposite force on the egg resulting in the egg breaking.
Therefore, from the law of conservation of momentum, the first egg did not break because it forward momentum is transferred to the cloth while the second egg broke, the block exerts an opposite force equal to the momentum of the egg on the egg.
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BRAINLIST!!!
Two metallic balls A and B carry the charges QA= 16×10^-9C and QB=-8×10^-9C.
We fixed balls A and B 5cm apart. Given e=1.6×10^-9C and k=9×10^9 S.I unit.
1) identify the ball that has excess of electrons.
2) calculate the number of deficit and excess of electrons on both balls.
3) calculate the force exerted by A on B.
ou are working for an athletic shoe company that has just developed a shoe that is 40% lighter than any shoe on the market. This shoe is ideal for distance runners, and your company is confident that runners around the world will want to buy the shoe. Based on this information, you suggest that your company charge a ________ price than other shoes on the market based on ______________.
I suggest that your company charge a premium price than other shoes on the market based on the shoe's unique selling proposition of being 40% lighter.
Since the shoe is ideal for distance runners, it can significantly improve their performance and reduce the risk of injury. This competitive advantage is likely to appeal to serious runners who are willing to pay a premium price for quality shoes that can enhance their performance. Additionally, the cost of research and development to create such a lightweight shoe is likely to be higher, which justifies a higher price point. However, it's important to conduct market research to ensure that the premium price is reasonable and within the range of what consumers are willing to pay for such a shoe.
The shoe's 40% lighter weight provides a competitive advantage, as it can enhance a runner's performance and reduce fatigue during long-distance runs. This innovative feature is likely to attract a niche market of serious distance runners who are willing to pay a premium for a product that caters specifically to their needs. In summary, the shoe's exceptional lightness and its potential to improve the running experience justify a higher price point compared to other athletic shoes on the market.
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Assume that at an actual temperature of freezing (0∘C) on a batch of thermometers, the temperatures displayed are normally distributed with a mean of 0∘C and a standard deviation of 1.00∘C. A single thermometer is randomly selected and tested. Find the probability of obtaining a reading greater than 0.11 " C if the actual temperature is freezing. The probability of obtaining a reading greater than 0.111∘C is:
The probability of obtaining a reading greater than 0.11°C from a randomly selected thermometer if the actual temperature is freezing is approximately 0.4562.
To find the probability of obtaining a reading greater than 0.11°C from a randomly selected thermometer if the actual temperature is freezing (0°C), we need to calculate the z-score and use the standard normal distribution.
The z-score formula is given by:
z = (x - μ) / σ
where:
x is the value we want to find the probability for (0.11°C),
μ is the mean of the distribution (0°C),
and σ is the standard deviation of the distribution (1.00°C).
Calculating the z-score:
z = (0.11 - 0) / 1.00
z = 0.11 / 1.00
z = 0.11
Now, we need to find the probability of obtaining a z-score greater than 0.11 from the standard normal distribution. We can look up this probability in a standard normal distribution table or use a calculator.
Using a standard normal distribution table, the probability of obtaining a z-score greater than 0.11 is approximately 0.4562.
Therefore, the probability of obtaining a reading greater than 0.11°C from a randomly selected thermometer if the actual temperature is freezing is approximately 0.4562.
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A 6.00 volt battery is in a circuit with two resistors, A and B, connected in parallel. If the current flowing
out of the battery is 90.0 mA, what is the value in ohms of B if A is 100 ?
Answer: \(200\Omega\)
Explanation:
Given
The battery used is 6V in magnitude
The current flow is 90 mA
If the resistance of A is \(100\Omega\)
Net resistance of the circuit is
\(R_{net}=\dfrac{V}{I}\\\\\Rightarrow R_{net}=\dfrac{6}{90\times 10^{-3}}\\\\\Rightarrow R_{net}=\dfrac{200}{3}\Omega\)
If A and B are in parallel then their net resistance must be \(\frac{200}{3}\)
\(\dfrac{1}{\frac{200}{3}}=\dfrac{1}{100}+\dfrac{1}{R_b}\\\\\Rightarrow \dfrac{1}{R_b}=\dfrac{3}{200}-\dfrac{1}{100}\\\\\Rightarrow \dfrac{1}{R_b}=\dfrac{3-2}{200}\\\\\Rightarrow R_b=200\Omega\)
A top-fuel dragster accelerates from rest to a velocity of 100 m/s in 8 s. What is the acceleration?
Answer:
100 m/s ÷ 8 = 12.5 m/s
Explanation:
You must put multiply (÷)
wind turbines convert the wind's __________ energy into electricity.
Wind turbines convert the wind's kinetic energy into electricity. This conversion of wind energy into electricity occurs through the principles of electromagnetic induction.
Wind turbines harness the kinetic energy of the wind and convert it into electrical energy. The process involves several key components. As the wind blows, it causes the turbine's blades to rotate. The rotation of the blades is driven by the kinetic energy of the wind. The spinning motion of the blades is connected to a generator, which converts the mechanical energy into electrical energy.
The conversion of wind energy into electricity occurs through the principles of electromagnetic induction. Inside the generator, the rotating motion of the turbine's blades induces a magnetic field. This magnetic field interacts with coils of wire, generating an electric current. This current is then conducted through a system of wires and transformers, ultimately delivering usable electricity to homes, businesses, or the power grid.
By harnessing the wind's kinetic energy, wind turbines provide a renewable and sustainable source of electricity. They play a significant role in generating clean energy and reducing reliance on fossil fuels, contributing to the transition to a more environmentally friendly power generation system.
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Copper (II) chloride reacts with magnesium nitride
Answer:
I don't know
Explanation:
because I'm not smart
In reality, the kinetic energy at the bottom of the ramp will always be less than the gravitational potential energy at the top of the ramp. Does this disprove the law of conservation of energy? Where did the "lost" energy go?
Answer:
Conservation of energy still holds - so somewhere in traversing some of the potential energy was converted into something other than kinetic energy.
The loss of energy can be attributed to several things - friction on the ramp, air resistance, friction within the item descending the ramp; in general one would say that some of the initial PE was lost during the descent of the ramp. and did not show up as KE.
A large crate is pushed across the floor with an effort of 45 Newtons. The box is pushed a distance of 3.5 meters. How much work is done?
Answer:
\(\boxed {\boxed {\sf 157.5 \ Joules }}\)
Explanation:
Work is equal to the product of force and distance.
\(W=F*d\)
The box is being pushed with an effort (force) of 45 Newtons and the distance is 3.5 meters.
\(F= 45 \ N \\d= 3.5 \ m\)
Substitute the values into the formula.
\(W= 45 \ N * 3.5 \ m\)
Multiply.
\(W= 157.5 \ N*m\)
1 Newton meter is equal to 1 Joule Our answer of 157.5 N*m equals 157.5 J\(W= 157.5 \ J\)
157.5 Joules of work are done on the crate.
What units are appropriate to express specific heat?
Select one:
1)g
-------
∘C
2)J
--------
g⋅∘C
3)cal
---------
J⋅∘C
4)cal
--------
∘C
The units for specific heat can either be joules per gram per degree (J/goC) or calories per gram per degree (cal/goC). Option 3 and 4 are correct.
Specific heat, the quantity of heat required to raise the temperature of one gram of a substance by one Celsius degree. The units of specific heat are usually calories or joules per gram per Celsius degree
Units are the measuring standards for the measurement of a particular quantity. The units for specific heat can either be joules per gram per degree (J/g⁰C) or calories per gram per degree (cal/g⁰C). So two options are correct.
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You throw a ball straight forward with a velocity of 20
m/s, from a height of 1 meter. How far will it be when it hits the ground after 0.45 seconds?
The ball will continue to advance at a speed of 2.0 m/s once it rolls off the edge of the table until it lands on the ground after 0.45 seconds.
Why do we do it?The ball is behaving just like it has been dropped. Nature is unconcerned by the fact that it is also advancing.
D=1/2gt2 and T=√2d/g
By entering the table's height and the gravitational acceleration, we can calculate the time in seconds:
t= √2(1.5m)/9.8m⋅s−2 = 0.553s
So, for a little bit longer than a half-second, the ball will be in the air (and thus able to move ahead). To find the distance travelled, we simply reverse the speed equation, s=dt, and insert in the speed and time:
d= 20m/s(0.553s)= 1.11m
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How to write an advertisement about child labour
Answer:
by writing everything happen to her or him
What controversial psychological study of prison life took place in 1971?
The controversial psychological study of prison life that took place in 1971 is known as the Stanford Prison Experiment. It was conducted by psychologist Philip Zimbardo and his team at Stanford University to examine how individuals adapt to the roles of prisoners and prison guards in a simulated prison environment.
The study involved 24 male college students who were randomly assigned to either the role of prisoner or guard. The experiment quickly spiraled out of control as the guards began to abuse their power, and the prisoners became increasingly submissive and depressed. The guards used psychological tactics such as humiliation, sleep deprivation, and even physical punishment to maintain their authority over the prisoners.
The study was meant to last for two weeks, but it was terminated after just six days due to the extreme and abusive behavior of the guards. The Stanford Prison Experiment remains controversial due to ethical concerns about the mistreatment of the participants and the potential long-term psychological effects on those who took part.
The study has had a significant impact on the field of psychology and has raised important questions about the ethics of conducting psychological research. It has also shed light on the dangers of group dynamics and how individuals can be easily influenced by social roles and situations.
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this clinical theorist believes that the whole concept of mental illness is invalid and is a myth.
The clinical theorist who believes that the concept of mental illness is invalid and a myth is Thomas Szasz.
He argues that mental illness is a metaphorical concept used to label and control non-conformist behavior, rather than a valid medical condition. Szasz suggests that mental disorders are problems of living, not diseases, and should be understood in the context of social and cultural factors. He believes that mental health issues should be addressed through individual responsibility and personal growth, rather than medical intervention. However, it's important to note that Szasz's views are highly controversial, and the majority of mental health professionals and researchers consider mental illnesses to be real medical conditions that require appropriate treatment and support.
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How can the efficiency of a simple machine be increased?
Answer:
Reduce friction
The speed of sound through air is approximately 340 m/sec. What is the wavelength of a sound wave with a frequency of 706 Hz? Round to the nearest hundredth
Answer:
Wavelength = 0.48 m (Approx)
Explanation:
Given:
Speed of sound = 340 m/s
Frequency = 706 hz
Find:
Wavelength
Computation:
Wavelength = Speed of sound / Frequency
Wavelength = 340 / 706
Wavelength = 0.48 m (Approx)
A 15 kg ball is launched forward from a height of 25 m. What is the net force of the ball
Answer:
147 newton.
Explanation:
Force is the product of mass and acceleration. The formula of force is given below: Force = mass x acceleration, but due to height we put gravity instead of acceleration. So by putting values of mass i. e. 15 kg and gravity i. e. 9.8 meter/ second in the formula we get the net force of the ball which is 147 newton or 147 kg meter/second square.
Which of the following changes will increase current?
OA. Decreasing power
OB. Increasing volume
OC. Increasing resistance
OD. Increasing voltage