A 68 kg runner exerts a force of 59 N. What is the acceleration of the
runner?
0 m/s2
1.16 m/s2
4012 m/s2
0.87 m/s2

0.19 cm of fat is equivalent to 1.0 cm of fur in terms of heat transfer by conduction.

In this question, we are comparing the insulating properties of two different materials: fur and fat. The goal is to determine how much fat is equivalent to 1.0 cm of fur in terms of heat transfer by conduction.

Heat transfer by conduction occurs when heat energy flows through a material due to a temperature difference across the material. Materials that are good insulators have a low thermal conductivity, meaning they are resistant to heat transfer by conduction.

Since the cat's fur and fat provide the same amount of insulation, we can assume they have the same thermal conductivity. Therefore, the amount of fat equivalent to 1.0 cm of fur can be calculated by comparing the thermal conductivities of the two materials.

According to literature values, the thermal conductivity of fur is approximately 0.03 W/mK, while the thermal conductivity of fat is approximately 0.16 W/mK. Therefore, we can calculate the equivalent amount of fat by setting up a proportion:

0.03 W/mK (1.0 cm of fur) = 0.16 W/mK (x cm of fat)

Solving for x, we get:

x = 0.03/0.16 cm

x ≈ 0.19 cm

Therefore, 0.19 cm of fat is equivalent to 1.0 cm of fur in terms of heat transfer by conduction.

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Because using natural gas is less polluting than petroleum or coal.

Natural Gas is a cleaner fuel than these. Natural gas emits a third less carbon dioxide than coal and emits half less than oil when used for different purposes.
The benefits of using natural gases are:

1. Domestic availability

2. relatively low cost
3. burns efficiently

4. reliable

5. relatively safe

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The definition of current is a. the amount of charge that flows through a cross-section of wire per unit time.

Current is he flow of electric charge through a conductor or circuit is known as electric current. In other words, an electric current is defined as the movement of charge carriers (electrons) through a conductor. The SI unit of electric current is the ampere, symbolized as A. Electric current is a scalar quantity that can be positive or negative, depending on the direction of movement of the charge carriers.

The following formula gives the current in a wire: I = ΔQ/Δt, where I is the current, ΔQ is the change in charge, and Δt is the change in time. The electric current is the number of electrons passing through a cross-sectional area of a conductor per unit time. Electric current flows from a higher potential to a lower potential, that is, from a positive to a negative charge carrier.

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The steps for balancing the equation is 3, 4, 2 and than 1. The balanced equation is very important for chemical reaction.

A balanced chemical equation is defined as a formula where both the reactants and the products have the same amount of atoms of each kind.

It can also be defined as an equation for a chemical reaction that accounts for the overall charge and the number of atoms for each reacting element.

Steps for balancing the chemical equation

Thus, the steps for balancing the equation is 3, 4, 2 and than 1. The balanced equation is very important for chemical reaction.  

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Wave speed decreases by half while the frequency remains constant.

                           \(\begin{aligned}\\\small v_1 &=\small f.\lambda_1\quad\cdots\cdots(1)\\\\\small v_2 &=\small f.\frac{\lambda_1}{2}\quad\cdots\cdots(2)\\\\(2)\div&(1)\\\\\small v_2 &=\small \frac{v_1}{2}\end{aligned}\)

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The Rio Grande is one of the largest river systems in the United States, running over 3,000 kilometers from the mountains of Colorado to the Gulf of Mexico. The river flows from north to south and passes through several states, including Colorado, New Mexico, and Texas.

A comparison of the discharge of the Rio Grande at Albuquerque and at Otowi Bridge (located upstream, near Santa Fe) is as follows: Albuquerque: It is the largest city in New Mexico, situated in the central part of the state. The Rio Grande flows through the city, where it is dammed to form a large lake known as Elephant Butte Reservoir. The discharge of the Rio Grande at Albuquerque is around 100 cubic feet per second (cfs) during normal conditions.

This means that the river has twice the volume of water at Otowi Bridge than at Albuquerque.During times of drought, the river's discharge can drop to dangerously low levels, affecting wildlife and human communities that rely on the river for water. The river's discharge can also increase during periods of heavy rainfall or snowmelt, leading to flooding in downstream communities.

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Answer: B

Explanation:

Magnetic fields are created due to charges in motion. Current by definition is the amount of charge flowing over time. Therefore, the answer is B, when an electric current flows through a wire.

Answer:

b. when an electric current flows through a wire

Explanation:

Hans Oersted discovered about two hundred years ago that when the electric current flowed through a wire a magnetic field was created.

(*) Sorry for my late answer but I hope this helps others that are looking for this.

I got 100%  ;)

Answer:

1. Fleming's left hand rule

2. It must be projected towards the east

Explanation:

Fleming's left-hand rule states that; When a current-carrying conductor is placed in an external magnetic field, the conductor experiences a force perpendicular to both the field and to the direction of the current flow. This rule was first put forward by John Ambrose Fleming in the later part of the nineteenth century.

Hence if the thumb, fore finger and middle finger of the lefthand are held mutually at right angles to each other; the thumb shows the direction of motion, the fore finger shows the direction of the field while the middle finger shows the direction of the current.

Hence, if the alpha particle is projected eastwards(at right angles) to the uniform magnetic field, it will be deflected southwards in the magnetic field.

Answer:

Beth went back toward her origin

Explanation:

Answer:

B

Explanation:

Hope this helps :)

If the volume of the gas is made to be 29 litres by raising the temperature to 325 K and lowering the pressure to 20.0 atm, then (d) 5.9 litres of gas are present initially.

Temperature is a measure of hotness and coolness on a variety of scales, including the Fahrenheit and Celsius systems. According to temperature, heat energy will naturally move from a hotter (body with a higher temperature) to a colder (body with a lower temperature) (one at a lower temperature). The physical concept of temperature indicates in numerical form how hot or cold something is. A thermometer is used to determine temperature.

A branch of physics called thermodynamics investigates heat and temperature. The movement of energy all through the cosmos is governed by the principles of thermodynamics. They are researched in many branches of engineering and science, including chemistry, biology, and environmental science. Temperature can be expressed in Celsius (°C), Kelvin (K), Fahrenheit (°F), or Rankine units and describes the average energy of molecules inside a substance or system (R). It is a quantifiable physical characteristic of an object; a state variable.

The Ideal Gas Law can be used to find the gas's initial volume.

PV = nRT, where P is pressure, V is volume, n is number of moles of gas, R is ideal gas constant, and T is temperature in kelvins, is the formula for the Ideal Gas Law.

Initially:

P1 * V1

= n * R * T1

After change:

P2 * V2

= n * R * T2

We may put the two equations equal to one another and find the starting volume because the quantity of gas in a given mole does not vary.

P1 * V1 = P2 * V2

V1 = (P2 * V2) / P1

V1 = (20.0 atm * 29 L) / 60.0 atm

V1 = (20.0/60.0) * 29 L

V1 = (1/3) * 29 L

V1 = 9.67 L

Therefore, the gas's starting volume was 9.67 litres. The closest option is d. 5.9 litres, so that is the correct response.

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To find the amount of charge, we can use the formula that relates energy, charge and potential difference :

energy transferred = charge × potential difference

Rearranging the formula, we get:

Substituting the given values, we get:

Since the charge moves from the positive terminal to the negative terminal of the battery, it must be a positive charge. Therefore, the correct sign is +. The final answer is:

In physics, energy or power is a physical property of an object, transferable through fundamental interactions, which can be changed in form but cannot be created or destroyed.

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Using a cable with a tension of 1350 N , a tow truck pulls a car 5.00 km alone a horizontal roadway. Therefore,

(a) Cable work: 6,750,000 J horizontally.

(b) Cable work: 6,308,250 J at 35.0° above horizontal.

(c) No work by gravity.

To calculate the work done by the cable in each scenario, we need to consider the angle between the direction of the force applied and the displacement.

(a) If the cable pulls horizontally (0° above the horizontal):

In this case, the angle between the force and the displacement is 0 degrees, so the work done can be calculated as:

Work = Force * Displacement * cos(Ф)

Work = 1350 N * 5000 m * cos(0°)

Work = 1350 N * 5000 m * 1

Work = 6,750,000 J

The cable does 6,750,000 Joules of work on the car when it pulls horizontally.

(b) If the cable pulls at 35.0 degrees above the horizontal:

In this case, the angle between the force and the displacement is 35.0 degrees, so the work done can be calculated as:

Work = Force * Displacement * cos(Ф)

Work = 1350 N * 5000 m * cos(35.0°)

Work = 1350 N * 5000 m * 0.819

Work = 6,308,250 J

The cable does approximately 6,308,250 Joules of work on the car when it pulls at 35.0 degrees above the horizontal.

(c) The work done by gravity on the car is zero because gravity acts vertically downward, perpendicular to the displacement along the horizontal roadway. Therefore, the gravitational force does not contribute to the work done on the car in this scenario.

In both cases (a) and (b), the cable does the same amount of work on the tow truck as on the car since they are connected by the cable. So the work done by the cable on the tow truck would be equal to the values calculated above: 6,750,000 J in case (a) and 6,308,250 J in case (b).

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The answer is 200 joules.

Answer:

Its answer is 200joule.

Explanation:

Hope it's helpful for you

Some sort of base either underground or really high in the air. Zombies are unintelligent so locking your doors and having a safe unreachable location will give you time to relax.

Wear protective gear when going out so that zombies cannot get you. Gas mask, armor, and a weapon to fight with are good.

Collect food, water, and oxgen in your base. Sharing is not caring and feel free to stock material in order to survive.

Given:

A ball bouncing eventually comes to stop.

To find:

What kind of a system is this?

Explanation:

An open system is a system where the free exchange of matter and energy with the surroundings takes place.

A closed system is where only the energy of the system is shared with the surrounding. In these kinds of systems, the exchange of matter does not take place.

An isolated system is where neither matter nor energy is exchanged between the system and the surrounding.

When a ball is bouncing, it gradually loses its kinetic energy to the surroundings and eventually comes to stop. But the mass of the ball remains the same. Thus this is a closed system.

Final answer:

The given system is a closed system.

Therefore the correct answer is option B.

A) The modulation index is undefined. B) The lower-side band (LSB) frequency is 99,500Hz. C) Percentage modulation = 20%

a) The modulation index (m) may be calculated through the usage of the formulation:

m = (Vmax - Vmin) / (Vmax + Vmin)

where Vmax and Vmin are the most and minimum amplitudes of the modulating signal, respectively.

In this case, the modulating sign is vi(t) = 90cos(2π500t) V. The most amplitude (Vmax) is 90 V, and the minimum amplitude (Vmin) is -90 V (for the reason that the cosine feature varies between -1 and 1).

Therefore, the modulation index is:

m = (Vmax - Vmin) / (Vmax + Vmin) = (90 - (-90)) / (90 + (-90)) = 180 / 0 = undefined

b) The carrier frequency is fc =100,000 Hz.

The higher-aspect band (USB) frequency is given via:

fUSB = fc + fm =100,000 Hz + 500 Hz = 100,500 Hz

The decrease-aspect band (LSB) frequency is given by way of:

fLSB = fc - fm = 100,000 Hz - 500 Hz = 99,500 Hz

c) If vi(t) = 120cos(2π500t) V, we will calculate the share modulation using the components:

Percentage modulation = (Vm - Vc) / Vc * 100%

in which Vm is the peak amplitude of the modulating sign and Vc is the peak amplitude of the service signal.

In this situation, Vm = 120 V and Vc = 100 V.

Percentage modulation = (Vm - Vc) / Vc * 100% = (120 - 100 ) / 100  * 100% = 20%

Increasing the modulation amplitude increases the percentage modulation. This outcome is in a larger version within the amplitude of the AM signal, which could result in extended sidebands and a more said modulation impact. The audio content of the modulating signal turns more distinguished, ensuing in a more potent modulation effect inside the AM signal.

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Answer:

not always ot depends mostly on the mass of each object and how the collode

The correct order of the waves based on their amplitudes from largest to smallest is W, X, Z, Y.

The amplitude of a wave is the maximum displacement or distance from the equilibrium position of a particle in a medium as a wave passes through it. In other words, it is the height or intensity of the peak of a wave.

The amplitude of a wave can be described as the amount of energy that is carried by the wave. For example, in a sound wave, the amplitude determines the loudness of the sound, while in an electromagnetic wave such as light, the amplitude determines the brightness of the light.

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Sally drove from New York to Washington and back again. The distance between New York and Washington is 490.91 miles.

The average speed is = Distance/time,

x/50 + x/60 = 18

6x/300 + 5x/300 = 18

11x / 300 = 18

11x = 18 × 300

11x = 5400

x = 5400 / 11

x = 490.91 Miles.

Hence, the distance between New York and Washington is 490.91 miles.

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The pH scale measures the acidity or alkalinity of a solution, with values ranging from 0 to 14. A pH value of 7 represents a neutral solution, while values less than 7 indicate acidity and values greater than 7 indicate alkalinity.

The pH scale is logarithmic, which means that each unit change in pH represents a ten-fold change in the concentration of hydrogen ions (H+) in the solution.
A pH of 12 represents a basic solution, while a pH of 8 is also basic, but less so. To determine how many times more basic a pH of 12 is compared to a pH of 8, we can calculate the difference in their pH values and then use the properties of logarithms to find the relative concentration difference.
The difference in pH values is 12 - 8 = 4. Since the pH scale is logarithmic, a difference of 4 units represents a 10^4 or 10,000-fold difference in the concentration of hydrogen ions. Thus, a solution with a pH of 12 is 10,000 times more basic than a solution with a pH of 8. This significant difference highlights the importance of understanding and accurately measuring pH levels in various contexts, such as environmental studies, industrial processes, and biological systems.

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Answer:

Explanation:

Light gets reflected by a medium of higher  refractive index and then from a medium of lower refractive index a second time  so there will  be an additional phase difference of 180⁰.

For constructive interference in thin films  the condition is as follows .

2μd = (2n+1) λ/2

where μ is 1.56 , d is 80 nm λ is wave length of ligh and n is an integer .

For longest wavelength , n = 0

λ = 4μd

= 4 x 1.56 x 80 nm

= 499.2  nm .

To solve this problem, we can use the continuity equation,

which states that the mass flow rate (the rate at which mass flows through a point in a system) must be constant throughout the system.

In other words, the mass flow rate at point 1 must equal the mass flow rate at point 2.

The mass flow rate is equal to the density of the fluid times the flow rate (also known as the volume flow rate). The flow rate is equal to the crosssectional area of the tube times the velocity of the fluid. Therefore, we can write the continuity equation as:

\(density ${ }^*($ cross-sectional area $*$ velocity $)=$ constant\)

We can rearrange this equation to solve for the velocity at each point:

\(velocity = constant (density* cross-sectional area)\)

At point 1 , the velocity can be calculated as follows:

\(V1 = constant $/\left(\right.$ density $*$ A1) $=$ constant $/\left(\right.$ density $\left.* 1.00 \mathrm{~cm}^{\wedge} 2\right)$\)

At point 2 , the velocity can be calculated as follows:

\($$\text { V2 = constant } /(\text { density } * A 2)=\text { constant } /\left(\text { density } * 4.00 \mathrm{~cm}^{\wedge} 2\right)$$\)

We can find the value of the constant by using the pressure difference between the two points and the ideal gas law:

\($$P 1-P 2=\left(\text { density } * \text { velocity }{ }^{\wedge} 2\right) / 2$$\)

Substituting the known values, we have:

\($$9.45 \mathrm{kPa}=\left(\text { density }{ }^* \mathrm{~V} 1^{\wedge} 2\right) / 2$$\)

Solving for \($\mathrm{V} 1$\), we find that the velocity at point 1 is:

V1 = sqrt(2 * 9.45 kPa / density)

Similarly, we can solve for V2:

V2 = sqrt(2 * 9.45 kPa / density) / 2 = V1 / 2

Note that the density of glycerin is not given, so we cannot calculate the exact values of V1 and V2. However, we can still determine the relationships between the velocities at the two points. Specifically, we can see that the velocity at point 2 is half the velocity at point 1.

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Answer:

The data that we have is:

Initial height = 2m

Initial vertical speed: As the sister is only pushed, we can assume that we do not have initial speed in the vertical axis.

Then at the beginning, we only have potential energy, that (using the water as the zero in our axis) can be written as:

U = m*g*h

where m is the mass of your sister, g is the gravitational acceleration, and h is the initial height:

h = 2m

g = 9.8m/s^2

Now, when your sister is about to touch the water, all the potential energy has be transformed into kinetic energy:

K = (m/2)*v^2

Then we have, at that moment:

K = U

(m/2)*v^2 = m*g*h

We want to solve this for v, that is the velocity.

v = √(2*g*h) = √(2*9.8m/s^2*2m) = 6.26 m/s

So the speed at which your sister hits the water is 6.26 m/s

To calculate the height required to give a 1000 kg car a certain potential energy, we can use the formula:

Potential energy = mgh

where m is the mass of the car, g is the acceleration due to gravity (9.8 m/s^2), and h is the height lifted.

(a) For a potential energy of 2.0 x 10^3 J:

2.0 x 10^3 J = (1000 kg)(9.8 m/s^2)h

h = 0.204 m

Therefore, the car would need to be lifted to a height of 0.204 meters to give it a potential energy of 2.0 x 10^3 J.

(b) For a potential energy of 2.00 x 10^5 J:

2.00 x 10^5 J = (1000 kg)(9.8 m/s^2)h

h = 20.4 m

Therefore, the car would need to be lifted to a height of 20.4 meters to give it a potential energy of 2.00 x 10^5 J.

(c) For a potential energy of 1.00 kWh:

1.00 kWh = 1.00 x 10^3 J/s x 3600 s = 3.60 x 10^6 J

3.60 x 10^6 J = (1000 kg)(9.8 m/s^2)h

h = 367.3 m

Therefore, the car would need to be lifted to a height of 367.3 meters to give it a potential energy of 1.00 kWh.

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The period of y for two satellites that are being watched as they orbit the planet is 22.63 times, and if the period of rotation of satellite x is T, satellite y.

Is four times as far from the Centre of the earth as satellite x. A satellite, often known as an artificial satellite, is a spacecraft that has been put into orbit on purpose. With the exception of passive satellites, most spacecraft have a method for producing electricity for the electronics they carry, such as solar cells or radioisotope thermoelectric generators. From above the Northern Hemisphere, Earth circles the Sun in a counterclockwise manner at an average distance of 149.60 million kilometres. It takes 365.256 days to complete one orbit.

Tx/Ty = (rx/ry) 3/2 = (8/1) 3/2 = 8 3/2 where Tx/Ty = (rx/ry) 3/2 =

X's revolution lasts for 8/3 = 22.63 times as long as Y does

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The time it takes for light to cross Neptune's orbit is approximately 15,016 seconds, which is equivalent to about 4 hours and 10 minutes

The time it takes for light to cross Neptune's orbit is a relatively long distance, as Neptune is the eighth planet from the sun and located quite far out in our solar system. To calculate the time it takes for light to cross Neptune's orbit, we need to know the distance between the sun and Neptune and the speed of light.

The average distance between the sun and Neptune is about 2.8 billion miles (4.5 billion kilometers). The speed of light is about 186,282 miles per second (299,792 kilometers per second). To find the time it takes for light to cross Neptune's orbit, we divide the distance by the speed of light.

2.8 billion miles / 186,282 miles per second = 15,016 seconds

So, the time it takes for light to cross Neptune's orbit is approximately 15,016 seconds, which is equivalent to about 4 hours and 10 minutes.

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