tony walks at an average speed of 70m/min from home to school. If the difference between his home and the school is 2100 m, how much time does it take for Tony to walk to school?

The age of the cloth material is obtained from the calculation as  1843 years .

We know that the half life of a radioactive isotope refers to the time that is taken for only half of the number of the original radioactive isotopes that are present to remain in the sample.

We can be able to obtain the age of the cloth by looking at the amount of the radioactive carbon -14 that is still left in the sample. How do we do that? We have to turn to a formula that says;

0.693/\(t_{\frac{1}{2} }\) = 2.303/tlog (Ao/A)

\(t_{\frac{1}{2} }\) = half life of the material

t = age of the material

Ao = amount initially present

A = Amount present at time t

Then we have;

0.693/5730 = 2.303/tlog (Ao/0.8Ao)

1.21 * 10^-4 = 0.223/t

t = 0.223/1.21 * 10^-4

t = 1843 years

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Given:

Resistance, R = 5 ohms

Current, I = 9 amperes

Let's find the voltage.

To find the voltage, apply Ohm's law:

Where:

V is the voltage

I is the current = 9 amps

R is the resistance = 5 ohms

Thus, we have:

Therefore, the voltage is 45 volts.

ANSWER:

45 volts

Shenna has recorded the property of cleavage. Cleavage refers to the tendency of a mineral to break along flat, smooth planes due to its internal structure.structure.So,The correct option would be (A) Cleavage.

Cleavage is a property that describes how a mineral breaks along planes of weakness, resulting in smooth, flat surfaces. It is one of the key characteristics used to identify and classify minerals.

In the given observations, Shenna noted that the mineral sample called "Mica" breaks into thin sheets. This characteristic indicates that Mica exhibits cleavage. When Mica is subjected to stress or force, it breaks along flat planes, resulting in thin, sheet-like fragments.

On the other hand, Shenna described the mineral sample called "Pyrite" as having cubic crystals. While this information is valuable for identifying Pyrite, it does not pertain directly to the property of cleavage.

Shenna has recorded the property of cleavage based on his observation that the mineral sample called "Mica" breaks into thin sheets.sheets.Hence the correct answer is Cleavage. Cleavage refers to the tendency of a mineral to break along flat, smooth planes due to its internal structure.

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Answer:

22.5kg

Explanation:

Since we not told wat to find, we can as well find the mass of the beaver.

Kinetic energy formula is expressed as;

KE = 1/2mv²

m is the mass

v is the speed

Given

KE = 45Joules

v = 2.0m/s

Substitute into the formula and get the mass

45 = 1/2m(2)²

45 = 2m

m =45/2

m = 22.5kg

Hence the mass of the beaver is 22.5kg

Answer: 1.2 x 10^7kg

Explanation:

Volume of tank = length x width x height

Volume = 51 x 20 x 11

Volume = 11220 m^3

Density = Mass/Volume

Density = 1030 kg/m^3

Volume = 11220 m^3

Mass = m

1030 = m/11220

m = 1030 x 11220

m = 11,556,600 kg or 1.2 x 10^7kg

A wire loop in an electric generator that is rotating, having an effect. The wire moves because of the conversion of magnetic energy into mechanical energy. (Selection A).

Energy is a phrase used to describe a property of matter & non-matter fields; energy is not a substance in and of itself. For instance, it's argued that kinetic energy exists when a substance moves. Potential energy comes in many different forms as well.

They include, for instance, energy from light, heat, mechanical motion, gravity, electricity, sound, chemicals, nuclear or atomic energy, and so forth. It is possible to alter or convert one form into another.

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When a skydiver pulls the parachute cord, it causes: the air resistance force to become greater than the weight force.

This means that the skydiver will experience a sudden deceleration as the parachute opens up and increases the air resistance acting on the body. As a result, the skydiver will slow down and gradually come to a stop.

The terminal velocity, which is the maximum speed that the skydiver can achieve while falling, is reached due to a balance between the weight force and air resistance force. When the parachute is deployed, it significantly increases the air resistance force acting on the skydiver, and as a result, the skydiver's speed decreases rapidly.

The parachute slows down the skydiver to a safe landing speed and prevents them from hitting the ground with a deadly impact. Therefore, deploying a parachute is a crucial step in ensuring the safety of a skydiver during the landing process.

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Answer:

216.32kN

Explanation:

Force can be expressed according to the formula;

Force = mass ×acceleration

Given

Mass = 1250kg

Velocity = 4.16m/s

Distance = 0.05m

We can get the acceleration first using the equation of motion

v² = u²+2as

4.16² = 0²+2a(0.05)

17.3056 = 0.1a

a = 17.3056/0.1

a = 173.056m/s²

Get the force required

Force = 1250×173.056

Force = 216,320N

Force = 216.32kN

Hence the force constant of the material is 216.32kN

A forces with magnitudes of 2000 newtons and 900 newtons act on a machine part at angles of 30° and -45°. The direction of the resultant force is approximately 8.7° (measured counterclockwise from the positive x-axis), and the magnitude of the resultant force is approximately 2405 N.

To find the direction and magnitude of the resultant of these forces, we can use vector addition. We'll break down the forces into their horizontal and vertical components and then add them together.

Let's start by calculating the horizontal and vertical components of each force:

Force 1:

Magnitude: 2000 N

Angle: 30°

Horizontal component of Force 1: 2000 N * cos(30°) ≈ 1732 N

Vertical component of Force 1: 2000 N * sin(30°) ≈ 1000 N

Force 2:

Magnitude: 900 N

Angle: -45°

Horizontal component of Force 2: 900 N * cos(-45°) ≈ 637 N

Vertical component of Force 2: 900 N * sin(-45°) ≈ -637 N (negative since it points downward)

Now, let's add the horizontal and vertical components together:

Horizontal component of the resultant = 1732 N + 637 N ≈ 2369 N

Vertical component of the resultant = 1000 N - 637 N ≈ 363 N

To find the magnitude of the resultant, we'll use the Pythagorean theorem:

Magnitude of the resultant = sqrt((Horizontal component)^2 + (Vertical component)^2)

Magnitude of the resultant = sqrt((2369 N)^2 + (363 N)^2)

Magnitude of the resultant ≈ 2405 N

Finally, we can find the angle of the resultant using the inverse tangent (arc tan) function:

Angle of the resultant = arc tan(Vertical component / Horizontal component)

Angle of the resultant = arc tan(363 N / 2369 N)

Angle of the resultant ≈ 8.7°

Therefore, the direction of the resultant force is approximately 8.7° (measured counterclockwise from the positive x-axis), and the magnitude of the resultant force is approximately 2405 N.

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The maximum wavelength of light capable of dissociating the f–f bond in one molecule of fluorine if the bond energy, or bond dissociation energy, is 157 kJ/mol is 7.625 × 10⁻⁵ meters.

Given:  

Bond dissociation energy = 157 kJ/mol.

we know,

Avogadro's number = 6.023 × 10²³ mole⁻¹

Speed of light = 3 × 10⁸ms⁻¹

Planck constant = 6.626 × 10⁻³⁴ Js

To calculate the maximum wavelength of light capable of dissociating the f–f bond in one molecule of fluorine,

The energy required to break one f--f bond is calculated as,

⇒ Bond energy / Avogadro's number

= 157 × 10³/ 6.023 × 10²³

= 26.067 × 10⁻²⁰ Joules

Let the wavelength of the light required to break one f -f bond be λ.

We find the maximum wavelength by using Einstein's equation for photon energy.

Einstein's equation for photon energy is represented mathematically by the following formula:

E = hf = hc / λ

In this equation,

Substituting the values in the formula,

⇒ 26.067 × 10⁻²⁰ = ( 6.626 × 10⁻³⁴ × 3 × 10⁸) / λ

⇒  λ = ( 6.626 × 10⁻³⁴ × 3 × 10⁸) / 26.067 × 10⁻²⁰

       =  7.625 × 10⁻⁵ m

Hence, the maximum wavelength is 7.625 × 10⁻⁵ m.

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Answer:

The process of comparison of unknown quantity with the help of known standard quantity is known as measurement...Hope this helps:)

Answer:

the comparison of an unknown quantity with the known quantity.

Explanation:

...........................................................................................................................

Answer:

An electron added to a noble gas must go in the next higher energy level. The periodic trend for electron affinity values is not as consistent as for other trends.

(a) The impulse reaction of the gadget is h(n) = δ(n+1) + δ(n-1). (b) The system is causal due to the fact the output simplest relies upon present and beyond inputs, x(n+1) and x(n-1), respectively. (c) The system is linear because it satisfies the homes of superposition and homogeneity.

(d) This is an IIR (Infinite Impulse Response) filter out because the output relies upon beyond inputs. (e) The frequency response of the machine is H(z) = \(z^(-1) + z\). (f) The device is BIBO strong considering its miles are linear and causal, and its impulse response is finite, ensuring bounded output for bounded enter.

(a) To discover the impulse reaction of the gadget, we want to enter an impulse signal. An impulse signal is represented as δ(n), that is 1 at n = 0 and 0 for all different values of n.

Let's alternative δ(n) into the given equation:

y(n) = x(n+1) + x(n-1)

For n = 0:

y(0) = x(1) + x(-1)

For n = 1:

y(1) = x(2) + x(0)

For n = -1:

y(-1) = x(0) + x(-2)

For n ≠ 0, 1, -1, y(n) = 0 considering the fact that x(n) = 0.

So, the impulse reaction of the gadget is:

h(n) = δ(n+1) + δ(n-1)

(b) The machine is causal if the output y(n) relies upon only on the present and beyond inputs x(n), x(n-1), x(n-2), and so forth. In this case, due to the fact that y(n) simplest depends on x(n+1) and x(n-1), it does not depend on future inputs. Therefore, the machine is causal.

(c) The system is linear if it satisfies the properties of superposition and homogeneity. Let's confirm these houses:

Superposition:

For two inputs \(x1(n)\)and \(x2(n)\) their corresponding outputs \(y1(n)\) , \(y2(n)\), we've got:

\(y1(n) = x1(n+1) + x1(n-1)\)

\(y2(n) = x2(n+1) + x2(n-1)\)

Now, allow's apply the machine to the linear aggregate of inputs:

\(y(n) = ax1(n) + bx2(n)\)

=\(a(x1(n+1) + x1(n-1)) + b(x2(n+1) + x2(n-1))\)

= \(ax1(n+1) + ax1(n-1) + bx2(n+1) + bx2(n-1)\)

This fits the output received when the system is carried out to the linear mixture of the person inputs. Therefore, the device is linear.

(d) This is an IIR (Infinite Impulse Response) clear out due to the fact the output depends on each contemporary and past input, as visible inside the equation y(n) = x(n+1) + x(n-1).

(e) To locate the frequency response, we will take the Z-remodel of the gadget's impulse response. Applying the Z-transform to the impulse response h(n) = δ(n+1) + δ(n-1), we get:

H(z) =\(Zh(n) = z^(-1) + z\)

The frequency response of the device is the Z-transform of the impulse reaction.

(f) BIBO (Bounded-Input Bounded-Output) stability refers to the belongings of the device to produce bounded output for any bounded input. In this example, because the system is linear and causal, and the impulse reaction is finite, the device is BIBO stable.

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The correct question is:

"A system with input x(n) and output y(n) is characterized by the following equation: y(n) = x(n+1) + x(n-1) (a) Find the impulse response of this system. (b) Is the system causal? Why or why not? (c) Is the system linear? Why or why not? (d) Is this an FIR or IIR filter? (e) Find the frequency response of the system. (f)Is this system BIBO stable? Why or why not?"

Answer:

because the friction in the baloons and the magnetism make it like nuclear fision

Explanation:

The magnetic field and friction between the balloons when placing two very strong magnets in the middle of two separate balloons provide a good model for nuclear fusion.

Nuclear fusion is the process through which light elements interact to create heavier elements (up to iron). Significant amounts of energy are released when interacting nuclei are from elements with low atomic numbers, such as hydrogen (atomic number 1) or its isotopes deuterium and tritium.

Thermonuclear weapons, or hydrogen bombs, which were created in the decade immediately following World War II, were the first to utilize the tremendous energy potential of nuclear fusion.

There are two main categories of fusion reactions: those that maintain the ratio of protons to neutrons and those that convert protons to neutrons.

Therefore, the magnetic field and friction in the balloons when placing two very strong magnets in the middle of two separate balloons provide a good model for nuclear fusion.

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Explanation:

Speed

= Wavelength * Frequency

= 340m * 2.5Hz

= 850m/s

To calculate the cost of delivering 10 kW of power to a home 100 miles away, we can start by drawing a schematic of the power transmission process.

The power is generated at a generating station with a voltage of less than 35,000 V. It is then stepped up using a transformer to a higher voltage of typically 345,000 V for transmission through power lines. Next, it is stepped down to 13,800 V for local transmission and finally, another step down transformer is used to bring the voltage down to 120 V for residential customers.

Now, let's calculate the cost per unit time to deliver 10 kW to the house.

First, we need to convert 10 kW to kilowatt-hours (kWh). Since power is measured in watts and time is measured in hours, we can divide 10 kW by the power factor (PF) to get the energy consumed in one hour.

The power factor is the ratio of real power (watts) to apparent power (volt-amperes). In this case, we assume an ideal power factor of 1, so the real power and apparent power are the same.

Since power is given in kilowatts (kW), we can convert it to watts by multiplying by 1000. So, 10 kW is equal to 10,000 watts.

Now, we need to find the energy consumed in one hour (kWh). We can use the formula:

Energy (kWh) = Power (watts) * Time (hours) / 1000

Plugging in the values, we get:

Energy (kWh) = 10,000 watts * 1 hour / 1000 = 10 kWh

Next, we need to calculate the cost of 10 kWh at a rate of 10 cents per kWh.

Cost = Energy (kWh) * Rate ($/kWh) = 10 kWh * $0.10/kWh = $1

So, it would cost $1 per unit time to deliver 10 kW to a house located 100 miles away when transmitting electricity at 120 V and 60 Hz.

Now, let's move on to the power factor in the problem above. Since we assumed an ideal power factor of 1, the power factor is 1.

If a large capacitor of 1F is used in parallel with the line coming into the house to filter out noise, we need to calculate the power lost in delivery. Assuming the same 10 kW load in parallel with the capacitor, we need to consider the power factor again.

In this case, the power factor will be affected by the reactive power of the capacitor. Reactive power is caused by the reactive components in the circuit, such as capacitors and inductors. To calculate the power factor, we need to know the reactive power and the apparent power.

The apparent power can be calculated using the formula:

Apparent Power (VA) = Voltage (V) * Current (A)

Since the load is parallel with the capacitor, the current will be the same for both the load and the capacitor. Therefore, the apparent power will be the same as the power consumed by the load.

Now, let's consider how to reduce the power factor and make it unity. The power factor can be improved by adding a power factor correction device, such as a capacitor or an inductor, to the circuit. These devices help to offset the reactive power and bring the power factor closer to unity (1).

In terms of resonance in a LCR circuit model, the inductor plays a role in storing and releasing energy in the form of a magnetic field. When the circuit is at resonance, the inductor and capacitor exchange energy back and forth, resulting in a high level of voltage and current oscillation. This can lead to increased losses and lower power factor if not properly managed.

The inductor current is determined by the inductance value and the rate of change of current flowing through it. It opposes changes in current, and in a resonant circuit, it helps to maintain a stable current flow.

The capacitor current is determined by the voltage across the capacitor and the capacitance value. It leads the voltage and helps to maintain a stable voltage across the capacitor.

to calculate the cost of delivering 10 kW to a home 100 miles away, we need to consider the power factor, energy consumption, and rate. Adding a large capacitor in parallel with the load can affect the power factor and result in power losses. Power factor can be improved by adding power factor correction devices. The inductor and capacitor in a resonance circuit play roles in storing and releasing energy.

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Explanation:

There are 5 kinematic equations, and 5 variables.

Each question will give you 3 variables and ask you to solve for a fourth.

To determine which equation to use, look at which variable is not included in the problem.

For example, if the question does not include time, then you need to use a kinematic equation that does not have t in it.  That would be:

v² = v₀² + 2aΔx

Or, if the question does not include the final velocity, then you need a kinematic equation that does not have v in it.  That would be:

Δx = v₀ t + ½ at²

Answer:

I Believe the Correct Answer is respiratory system; obtains oxygen so the energy in nutrients can be extracted.

Explanation:

Respiratory System is made for oxygen and involves the Lungs Diaphragm etc.

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Answer:

Two fundamental concepts govern energy as it relates to living organisms: the First Law of Thermodynamics states that total energy in a closed system is neither lost nor gained — it is only transformed. The Second Law of Thermodynamics states that entropy constantly increases in a closed system.

Explanation:

please mark me as the brainliest answer and please follow me

(b) the presence of technetium in giant star spectra. Astronomers have direct evidence supporting the formation of heavy elements in stars through the observation of certain elements in their spectra.

Here correct answer is B.

One such element is technetium (Tc), which is not naturally occurring on Earth and has no stable isotopes. The presence of Tc in the spectra of certain types of stars, particularly red giants and Mira variables, is a strong indicator of heavy element nucleosynthesis in stars.

This is because Tc is a radioactive element with a short half-life, so any Tc present in a star's atmosphere must have been produced relatively recently through nuclear reactions within the star itself.

Gamma-ray emissions from cobalt 56 decay in supernovae (a) and observed elemental abundances (c) are also used to support the idea of heavy element formation in stars, but they are not direct evidence.

The light curves of type-I supernovae (d) are used to study the expansion and evolution of these events and are not directly related to heavy element formation in stars. Therefore, the correct answer is (b) the presence of technetium in giant star spectra.

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The magnitude of the electric force between two charged particles is given by Coulomb's Law:

Where q_1 and q_2 are the charges of the particles, r is the distance between the charged particles and k is the Coulomb's Constant:

Since the magnitude of both charges is the same, the equation becomes:

The force and the distance between the particles are given, the value of k is known and the charge q is unknown. Isolate q from the equation:

Replace the values of r=24.04*10^-2m, F=87.96N as well as the value of k to find the magnitude of the charges:

Therefore, the magnitude of the charges in microCoulombs is: 23.78μC.

Explanation:

80*24=1920 or 1,920

Just multiply

\(hopethishelpsyou\)

Answer:

jeeze... this would be easier if the numbers were switched

Explanation:

i dont have an answer for ya but put 80x24=? in ur calculator

good luck m8

Well, the lines of workings are cut off in the middle, and there's no 2nd image.

But I think it must have to do with the "cos" terms at the right end of the picture.

I'm guessing now, because the part I'm interested in would be just past the edge, where we can't see it.

I think that the first line says "cos(some angle)", and at the same place in the second line it says "cos(180 - the same angle)".

If that's what it says, then that's your answer, because cos(anything) is equal to the negative of cos(180 - the same thing).

That's the best I can do for you just now.  Honestly, I don't see the connection yet between the question Dave is working on and the two lines I see in the picture.

The effect that changing plate separation and surface area has on your capacitor is that if the distance between the plates is increased then the capacitance of the capacitor will decrease. If the distance between the plates is decreased, then the capacitance of the capacitor will increase.

Similarly, if the surface area of the plates is increased, the capacitance of the capacitor will increase. If the surface area of the plates is decreased, the capacitance of the capacitor will decrease.The addition of a dielectric effect the capacitance by increasing the capacitance of the capacitor by a factor equal to the dielectric constant. The capacitance of the capacitor is given by the formula C = Kε0A/d  Therefore, the capacitance of the capacitor increases.Charge Q is stored on a capacitor in such a way that there is an equal and opposite charge on each plate. If the magnitude of the charge on one plate is q, then the magnitude of the charge on the other plate is -q.

The capacitance of a parallel-plate capacitor is given by the formula:C = ε0A/dWhere:C = capacitance of the capacitorε0 = permittivity of free spaceA = area of the platesd = distance between the platesIf the distance between the plates is increased, then the capacitance of the capacitor will decrease. If the distance between the plates is decreased, then the capacitance of the capacitor will increase.If the voltage across the equivalent capacitor is 3V, the charge on the equivalent capacitor is given by:Q = CeqV = (0.2F)(3V) = 0.6CIf the charge on the equivalent capacitor is 0.6C, the charge on capacitor C2 is given by:q2 = C2V = (0.05F)(3V) = 0.15CIf the charge on the equivalent capacitor is 0.6C, the charge on capacitor C3 is given by:q3 = C3V = (0.15F)(3V) = 0.45CTherefore, the capacitor that stores less charge is capacitor C2, because its capacitance is smaller than the capacitance of capacitor C3.

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Answer:

As the temperature is increased the more the energy store

Answer:

hydrochlorine +12÷B to the power of 4 -× y reapeated zminus 2 to the power of 9

To find the light speed in the glass, we can use the formula:

v = c / n

where v is the speed of light in the glass, c is the speed of light in a vacuum (approximately 3.00 x 10^8 m/s), and n is the refractive index of the glass.

Let's assume the refractive index of the glass is 1.50 (a typical value for glass).

v = (3.00 x 10^8 m/s) / 1.50 = 2.00 x 10^8 m/s

So, the speed of light in the glass is 2.00 x 10^8 m/s.

To find the number of wavelengths of the light inside the slide, we can use the formula:

n = d / λ

where n is the number of wavelengths, d is the thickness of the slide, and λ is the wavelength of the light.

Given:

d = 2 mm = 2 x 10^-3 m

λ = 510 nm = 510 x 10^-9 m

n = (2 x 10^-3 m) / (510 x 10^-9 m)

n = 3.92

So, approximately 3.92 wavelengths of the light are inside the slide.

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