what mass (in g) does 3.99 moles of kr have? a) 334 g b) 476 g c) 211 g d) 240 g e) 144 g

The age of the bone is 45840 years.

We'll begin by calculating the number of half-lives that has elapsed.

Amount remaining (N) = 0.3125 g

Initial amount (N₀) = 80 g

N × 2ⁿ = N₀

0.3125 × 2ⁿ = 80

Divide both side by 0.3125

2ⁿ = 80 / 0.3125

2ⁿ = 256

2ⁿ = 2⁸

Thus, 8 half-lives has elapsed

Finally, we shall determine the age of the bone.

Half-life (t½) = 5730 years

Number of half-lives (n) = 8

t = n × t½

t = 8 × 5730

Therefore, the age of the bone is 45840 years.

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Answer:

3200 is the answer have a good day

Explanation:

hope this helps? :))

Answer:

3,200

Explanation:

3,200

In the peak of summer, it hasn't rained in a week, and the plants are looking rough, so watering the plants for an hour is a good idea.

However, the next day, you come back to the garden, and the plants look in worse shape than they did previously, as if none of that water made it to the plant. Plants absorb water through their roots. The root system of a plant is responsible for drawing water and nutrients from the soil. A plant's root system must be able to absorb water quickly in order for the plant to grow and thrive. When the soil around the root system is dry, the roots will stop growing and will not be able to absorb water.

It may even start to die. Watering plants during the peak of summer is important because it will help keep the soil moist and prevent the roots from drying out. However, watering a plant too much can be harmful. If a plant is overwatered, the water may not be able to penetrate the soil and reach the roots. Instead, it may just sit on top of the soil, causing the roots to rot and die. This can cause the plant to wilt and die.To summarize, if the soil around the plant is too dry, the roots may not be able to absorb the water you gave them, causing the plant to look worse than before. Conversely, overwatering can also be harmful because the water may not be able to penetrate the soil and reach the roots, causing the roots to rot and die.

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Answer:     I

dk what rhe answer is but here is my prediction :)

Explanation:

If the rope is horizontal and the ball's speed is 10 m/s, what is the tension in the ... A 2 kg iron ball is swung in a horizontal circular path at the end of a 1.6 m length of rope. ... Freddie swings a 2 kg stone at the end of a thin rope of length 1.2 m. ... of an automobile tire that turns with a frequency of 11 Hz and has a linear speed ...

Answer:

0.5 mL/min

Explanation:

There are 1000 mL in a L, and 60 minutes in an hour.

0.03 L/hr × (1000 mL/L) × (1 hr / 60 min) = 0.5 mL/min

The light ray will travel at an angle of approximately 26.8 degrees off of normal inside the plastic. When a light ray travels from air into a flat piece of plastic with an index of refraction of 1.30 at an angle of 44.5 degrees off the plane of the surface, it will refract and change direction.

The angle that the light ray will travel inside the plastic can be found using Snell's Law, which states that the ratio of the sines of the angles of incidence and refraction is equal to the ratio of the indices of refraction of the two media:

sin(θ1) / sin(θ2) = n2 / n1

where θ1 is the angle of incidence (measured from the normal), θ2 is the angle of refraction (also measured from the normal), n1 is the index of refraction of the first medium (in this case, air), and n2 is the index of refraction of the second medium (in this case, the plastic).

We are given θ1 = 44.5 degrees and n1 = 1 (since air has an index of refraction very close to 1). We are also given n2 = 1.30. Solving for θ2, we get:

sin(θ2) = n1 / n2 * sin(θ1) = 1 / 1.30 * sin(44.5 degrees) ≈ 0.442

Taking the inverse sine of both sides, we get:

θ2 ≈ 26.8 degrees

Therefore, the light ray will travel at an angle of approximately 26.8 degrees off of normal inside the plastic.

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Answer:

37

Explanation:

because the gravitational acceleration is10N/kg so 370/10=37 answer 37kg

To find the equation of motion for a spring mass oscillator with a mass of 1 kg, a damping constant of 10.6, and a spring constant of 21.33, we'll use the following terms in the explanation: oscillator, motion, and explanation.

Step 1: Identify the parameters of the oscillator.
Mass (m) = 1 kg
Damping constant (b) = 10.6
Spring constant (k) = 21.33

Step 2: Write down the general equation of motion for a damped spring mass oscillator.
The equation of motion for a damped spring mass oscillator is given by:

m * a(t) + b * v(t) + k * x(t) = 0

where a(t) is the acceleration, v(t) is the velocity, and x(t) is the displacement of the oscillator at time t.

Step 3: Substitute the given values into the equation of motion.
1 * a(t) + 10.6 * v(t) + 21.33 * x(t) = 0

This is the equation of motion for the given spring mass oscillator with the specified parameters.

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3.00 x 0.68= 2.04

To find magnification, you multiply your object by the factor

Answer:

I believe it's A

Explanation:

Answer:

The velocity of the wave is, v = 180,000 m/s

Explanation:

Given data,

The frequency of the wave, f = 900 Hz

The wavelength of the wave, λ = 200 m

The formula for the speed of the wave when the frequency and wavelength are known,

                               v = λ x f

Substituting the given values in the above equation,

                               v = 200 m x 900 Hz

                                v = 180000 m/s

Hence, the velocity of the wave is, v = 180,000 m/s

Answer:

1 . What happens when you drop the stone?

Depending on the weight from which the stone was dropped, the glass might well break

2 depending on the size and weight and shape on the stone the glass might well break

3 depending on the density on the stone the stone might when float on the water

Explanition :

GIVE ME BRAINLESS PLEASE !!

The experiments are performed to check the observation of the theory.

The basin is filled with water to check the following observation in the question.

The answers are as follow:-

   2. The impact of stone created the ripple. The magnitude of the ripple depends on the height at which stone it was thrown.

    3. The ripple goes far as the weight of the stones

These are the answer to the following.

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Among the given changes, leaving a copper penny in vinegar until it turns green is an example of chemical change. Here, the copper metal undergo reaction with the acid.

A chemical change involves the breaking or making of chemical bonds to form a new product which have different properties than the initial one. The change which does not involve chemical bonds are physical changes.

When a copper penny is leaving in vinegar, the acetic acid in vinegar is reacting with the metal, make the copper salt of the acid and corrode the metal which changes the color on its surface. The reaction evolves hydrogen gas as well. It is a chemical change.

Boiling, magnetic separation, crushing of rock all are examples of physical changes. Therefore, option a is a chemical change.

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Answer:

Crumple Zones are parts of a car that are designed to deform and absorb large amounts of energy from car collisions and impacts. This helps reduce the force that acts on the driver in a car accident [1]. 2: Newton's Second Law states that Force= Mass x Acceleration

Explanation:

Answer:11

Explanation:

Just did it

Answer: it’s 11

Explanation:

I just did the question

Answer:

remove the danger that lead to injury

Explanation:

The best way is

Answer:

A

Explanation:

In the case of starlight passing through a cloud of hydrogen atoms, the dominant cause for line broadening is ________.

In the case of a laser beam passing through a methane cell, the largest line broadening effect is due to ________.

In the case of starlight passing through a cloud of hydrogen atoms, the dominant cause for line broadening depends on the given parameters. The natural line width (AwN) is primarily determined by the lifetime of the excited state, which is given as to. The Doppler width (Awp) is influenced by the temperature (T) and the mass of the particles. The collision width (Awc) is influenced by the collision cross section and the particle density (n). To determine the dominant cause, we need to compare these factors and assess which one contributes the most significantly to the line broadening.

In the case of a laser beam passing through a methane cell, the line broadening is affected by different factors. The natural line width (AwN) is related to the energy-level structure and transition probabilities of the absorbing molecules. The Doppler width (Awp) is influenced by the temperature (T) and the velocity distribution of the molecules. The flight time width (AwFT) is determined by the transit time of the molecules across the laser beam. To identify the largest contributor to line broadening, we need to evaluate these effects and determine which one has the most substantial impact on the broadening of the spectral line.

the dominant cause of line broadening in starlight passing through a cloud of hydrogen atoms and in a laser beam passing through a methane cell depends on various factors such as temperature, particle density, collision cross section, and energy-level structure. To determine the dominant cause and the largest contributor, a thorough analysis of these factors is required.

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The statements that accurately describe the human reaction to heat stress are (b) Humans sweat to lower their body temperature, (d) The target temperature of the human body changes when the environment changes and (e) All human individuals have the same capacity to react to excessive heat is not a correct statement

b) Humans sweat to lower their body temperature: When the body's core temperature rises above the normal range of 36.5 to 37.5 degrees Celsius (97.7 to 99.5 degrees Fahrenheit), sweat glands in the skin release sweat, which evaporates and cools the body.

d) The target temperature of the human body changes when the environment changes: The human body has an internal set point for temperature regulation, which is typically around 37 degrees Celsius (98.6 degrees Fahrenheit). However, this set point can change depending on the temperature of the environment.

e) All human individuals have the same capacity to react to excessive heat is not a correct statement: Individual variations in age, fitness level, health status, and acclimatization to heat can affect a person's ability to tolerate heat stress. For example, elderly individuals and those with certain medical conditions may have a reduced ability to regulate their body temperature, while athletes and people who are regularly exposed to hot environments may have a greater capacity to tolerate heat stress due to acclimatization.

Therefore, the correct options are (b) Humans sweat to lower their body temperature, (d) The target temperature of the human body changes when the environment changes and (e) All human individuals have the same capacity to react to excessive heat is not a correct statement

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The given question is incomplete, the complete question is:

Identify the statements that accurately describe the human reaction to heat stress.

Describes Human Reaction to Heat Stress:

a)Humans depend on sweating to regulate their temperature more than other primates do. b) Humans sweat to lower their body temperature c) Human bodies experience vasoconstriction, the narrowing of blood vessels. d) The target temperature of the human body changes when the environment changes. e) All human individuals have the same capacity to react to excessive heat

Simultaneous prompting method  involves providing a prompt with a 0 second delay and never increasing that delay.

The simultaneous prompting method is a technique created to reduce errors. It entails using a controlling prompt (i.e., one that causes the learner to give the right answer every time) right away after the instruction.

As a result, the learner never makes a mistake and always has access to reinforcement. It is a teaching strategy without flaws. To avoid or minimise errors, this prompt is always given with a zero-second delay or right away after the target stimulus (cue). Prior to training sessions, probe sessions are used to evaluate skill mastery.

Therefore, Simultaneous prompting method  involves providing a prompt with a 0 second delay and never increasing that delay.

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If it is linked in reverse and reading DC, it will display a negative value. If it's an analogue metre, a reverse DC connection will result in a zero reading.

Using a scale typically graduated in volts, millivolts (0.001 volt), or kilovolts, a voltmeter measures the voltages of either direct current or alternating current (1,000 volts). Many voltmeters today provide readings as numerical displays and are digital. Using a scale typically graduated in volts, millivolts (0.001 volt), or kilovolts, a voltmeter measures the voltages of either direct current or alternating current (1,000 volts).

By calculating the potential difference between the 2 resistance using the amount of current flowing through the circuit, the reading of the voltmeter may be obtained. The potential difference across a resistance R, through which a current I is flowing, is represented by the equation V=IR. The circuit and ammeter are connected in series. A static electrical field produces the deflection torque in an electrostatic type voltmeter. Only high voltage is measured using many voltmeters. Digital voltmeter (DVM): By converting an unknown input voltage to a digital value, a digital voltmeter (DVM) can measure it and display the result in numeric form.

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Multiple shadow regions can be observed in the wall behind the keyhole of a door. Option B is correct.

It is a phenomenon that happens when a wave (Light) is passed through a narrow aperture or a sharp edge, the light bends at the edges.

The light bends at the edges because the sharp edges have less diameter than the wavelength of light.

Therefore, multiple shadow regions can be observed in the wall behind the keyhole of a door.

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Answer: B) It spreads out into multiple shadow regions.

Explanation:

I got it right on edge

Answer:

3.125×10²¹ N/C

Explanation:

Electric Field: This can be defined as the force experienced per unit charge. The S.I unit of electric Field is N/C

Applying,

E = F/q.................. Equation 1

Where E = Electric Field, F = Force experienced, q = Charge of an electron.

From the question,

Given: F = 500 N, q = 1.6×10⁻¹⁹ C

Substitute these values into equation 1

E = 500/(1.6×10⁻¹⁹)

E = 312.5×10¹⁹

E = 3.125×10²¹ N/C

The magnitude of the resultant force (in nano-newtons) on the 9nc charge at the origin is 0nN.

The magnitude of the resultant force on the 9nC charge at the origin can be calculated using Coulomb's law. The equation is F = kQq/r2, where F is the magnitude of the force, k is the Coulomb constant (8.98755 x 10^9 N·m2/C2), Q and q are the charges of the two objects, and r is the distance between them. Since the charge at the origin is 9nC (0.000009 C) and the distance is 0, the resultant force is 0nN.

F = kQq/r2

Q =  9nC (0.000009 C)

r = 0 ; q = 0C

Coulomb constant "k" = 8.98755 x 10^9 N·m2/C2

put the value of "k", "Q", "q", "r" in F = kQq/r2

we get F = 0nN.

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The thermal efficiency of the heat engine is half that of the Carnot engine, with a relative efficiency of 0.365.

The thermal efficiency of a Carnot engine is given by:

η = 1 - (T2/T1)

Where T1 and T2 are the temperature of the heat source and heat sink respectively.

In this case, T1 = 100°C and T2 = 375°C, so the thermal efficiency of the Carnot engine is:

η = 1 - (375/100) = 0.73

The thermal efficiency of the heat engine is therefore half of that of the Carnot engine, so its relative efficiency is 0.365.

If the heat engine absorbs heat at a rate of 50kW, then the rate of heat exhausted would be 50kW multiplied by the relative efficiency of 0.365, which is 18.25kW.

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Answer:

the final temperature of the gas is 785.18 K

Explanation:

The computation of the final temperature of the gas is shown below:

Here we apply the gas law

= PV ÷ T

Given that

P1 = 1.9 atm

V1 = 24.6 L

T1 = 335 K  

P2 = 3.5 atm

V2 = 31.3 L  

T2 = ?

Now

P1V1 ÷ T1 = P2V2 ÷ T2

(1.9 × 24.6) ÷ 335 = (3.5 × 31.3)/T2

T2 = 785.18 K

hence, the final temperature of the gas is 785.18 K

Answer: D

Explanation: edge

Therefore, the magnitude of the net force on the wire segment is zero. The direction of the net force is along the negative x-axis. Answer: The magnitude of the net force on the wire segment is zero. The direction of the net force is along the negative x-axis.

We are given that the wire segment AB is in a uniform magnetic field B = 0.8 T in the + z-direction. The current through the wire is I = 5.00 A in the direction from point a to point b, which are on the +y-axis and +x-axis respectively. We are to find the magnitude and direction of the net force that the magnetic field exerts on the wire segment. Here's how we can solve the problem:

1. Calculate the magnetic force on the wire segment from a to b, using the formula:

F = IL x B

where L is the length of the wire segment.

2. Calculate the magnetic force on the wire segment from b to a, using the same formula.

3. Add the two forces vectorially to get the net force on the wire segment.

Since the wire segment makes an angle of 45° with the x-axis, we can take L = r∆θ, where r is the radius of the circular arc and ∆θ is the angle between a and b at the center of the circle.

∆θ = 90° - 45° = 45°L = r∆θ = 0.2 m × 45° = 0.2 m × π/4 = 0.157 m

Now, using the formula

F = IL x B,

we have:

F₁ = I L B sin θ

where θ is the angle between the current direction and the magnetic field direction.

For the segment from a to b,θ₁ = 90° since the current is perpendicular to the magnetic field, so:

F₁ = I L B = 5.00 A × 0.157 m × 0.8 T = 0.628 N

Now, for the segment from b to a, the current is in the opposite direction and hence the force will be in the opposite direction.

θ₂ = -90°F₂ = -I L B = -0.628 N

The net force is:

F_net = F₁ + F₂ = 0.628 N - 0.628 N = 0 N

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Answer:

I get up at 5 in the morning exercise then take a shower then go back to sleep till it's time to eat breakfast and go to school. Then at 7 or 8 o clock pm after i eat dinner at 5 i exercise at 7 then take a shower and then go to bed i do this everyday.

Explanation:

Getting off the couch or out of your seat to start walking, running, bicycling, swimming or other activity may help you lead a healthier and happier life. ... Those activities can include walking briskly, gardening, bicycling slowly or even ballroom dancing.