The estimated distance of the earth from the sun is 149000000km. The speed of the light is 300000km/s. What is the time taken for the light to travel from the sun to the earth

The piston the student is standing on has a 0.22-times larger diameter than the piston the elephant stands on.

Given parameters:

Mass of the student: m = 70 kg.

Mass of the elephant: M = 1200 kg.

Let the diameters of the piston the student is standing on and the piston the elephant is standing on are respectively d and D.

Using Pascal's law , we can write,

Force applied by the student's weight  ÷ area  of the piston the student is standing on = Force applied by the elephant's weight ÷ area  of the piston the elephant is standing on.

⇒ 70 kg × g / π d² = 1200 kg × g / π D²

⇒ 1400 d² = 70 D²

⇒ d= 0.22D.

Hence, The piston the student is standing on has a diameter that is 0.22 times larger than the piston the elephant is standing on.

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Answer:

the correct one is A hope it helps

Movement refers to the way people walk, run, or perform other physical activities. The process of changing body place or direction is referred to as movement. The motion of a body segment, such as a limb, is referred to as a movement.

The movement that straightens a joint, returning it to zero position is an extension. The zero position refers to the default, resting position of a joint before any motion occurs. In this position, the joint's anatomical structure is in its most stable and neutral position, allowing for optimal force generation and movement. The extension is the movement of a joint that straightens or opens the angle between the bones or parts of the body. For example, extension is when you move your forearm from a bent position to a straight position. So, extension is the movement that straightens a joint, returning it to zero position. Hence, the answer is an extension.

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Answer:

both velocity and acceleration

Explanation:

answer May be 3

The benefit of employing two-sided printing that was highlighted in class as being the most important is that it only requires one sheet of paper as opposed to two when printing a two-sided document.

Standard 2-sided printing can be used to print on both sides of a sheet. You can choose between manual and automatic printing. When printing by hand, even-numbered pages are printed first. After printing these pages, you may simply reload them to print the odd-numbered pages on the opposite side of the paper.

Therefore, double-sided printing can save your business about half as much money as single-sided printing, according to certain important estimates. Due to the fact that duplex printing uses only half as much paper as one-sided printing, businesses can reduce their material costs.

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The differential heating of Land and water depends on amount of solar energy reaching earth.

Land is a better conductor of heat than water, heating up and cooling down faster than water.

In summer, amount of solar radiation is highest hence difference of water and land temperature is highest. Air over land heats up and expands hence the air rises above. This rising air is replaced with the surrounding air rich in moisture content from over ocean surface. The degree of differential heating depends on amount of solar energy reaching earth's surface.

This results in Sea Breeze which is from a large body of water towards landmass due to difference in pressure created.

Land Breeze blows towards sea from land at night. It is due to difference in rate of cooling of land and ocean.

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Answer: Down below is the answer in complete sentences!

Explanation:

PART A:

Gravity and Acceleration are two additional forces acting upon the sled.

PART B:

Gravity will affect the sled by pulling it down, since the slope of the hill is negative.

Acceleration will affect the sled by gradually increasing it's speed, since the slope is downwards, which in addition to the initial force exerted plus gravity increases the speed, thus the sled accelerates.

Answer:

10.71 mL

Explanation:

We know,

=> density= mass/volume

=> 1.4 = 15 / Volume

=> volume= 15/1.4 mL

=> volume= 10.71 mL

Answer:  A

Explanation:

The satement is true.

This comes from the fact that, according to Einstein:

and since c² is a very large number then, if we find a way to convert all the mass in energy a small amount will produce a large amount of energy.

Answer:

b because to react with something makes it a chemical reaction

Explanation:

The approximate band of frequencies occupied by the FM waveform is approximately 60600 Hz centered around the carrier frequency of 2 MHz (2000000 Hz).

To find the approximate band of frequencies occupied by an FM waveform, we need to consider the frequency deviation and the range of modulation frequencies.

In Frequency Modulation (FM), the frequency deviation (Δf) is given by the product of the modulation index (m) and the maximum frequency of the modulating signal (fm). The modulation index (m) is the ratio of the frequency deviation to the maximum frequency of the modulating signal.

Given:

Carrier frequency (fc) = 2 MHz = 2 × 10⁶ Hz

Frequency deviation constant (k_f) = 100 Hz/V

The modulation index (m) can be calculated using the formula:

m = k_f × s(t)_max

Here, s(t)_max represents the maximum amplitude of the modulating signal.

Given:

s(t) = 100cos(2π150t) + 200cos(2π300t) volts

Maximum amplitude of s(t) = maximum amplitude of 100cos(2π150t) + maximum amplitude of 200cos(2π300t) = 100 + 200 = 300 volts

Therefore, s(t)_max = 300 volts

Now, we can calculate the modulation index:

m = k_f × s(t)_max

= 100 Hz/V × 300 volts

= 30000 Hz

The approximate band of frequencies occupied by the FM waveform is given by:

Δf ≈ 2 × (m + fm)

Here, fm represents the maximum frequency component in the modulating signal.

In this case, the maximum frequency component in the modulating signal is 300 Hz (since the term with 300t has the highest frequency).

Δf ≈ 2 × (m + fm)

≈ 2 × (30000 Hz + 300 Hz)

≈ 2 × 30300 Hz

≈ 60600 Hz

Therefore, the approximate band of frequencies occupied by the FM waveform is approximately 60600 Hz centered around the carrier frequency of 2 MHz (2000000 Hz).

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Answer:

Explanation:

On return to Earth, gravity once again “pulls” the blood and fluids into the abdomen and legs. The loss of blood volume, combined with atrophy of the heart and blood vessels that can occur in space, reduces the ability to regulate a drop in blood pressure that happens when we stand on Earth.

Endothermic chemical reactions occur when the reactants take in heat energy from their environment to create products. A cooling effect is produced by these reactions because they cause their surroundings to become cooler.

The term "endothermic" refers to chemical reactions that either completely absorb or use energy. When bonds inside the reactants are broken, more energy is taken in than is released when fresh bonds form in the product lines. This is known as an endothermic reaction.

                                                                                                                                                                                                                                                                                                                              Examples of endothermic processes include photosynthesis, the evaporation of liquids, the melting of ice and dry ice, the cracking of alkanes, thermal decomposition, the oxidation of ammonium chloride in water, and many others.

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Answer:

4. The choose b. 0.000355

Ans; 3.55× 10-⁴ = 0.000355

5. The choose C. 80600

Ans; 8.06 ×10⁴= 806×10² = 80600

I hope I helped you^_^

Answer:

Lysosme

Explanation:

All plant cells have cell walls due to their ability to not protect themseleves unlike us humans or aniamls. Ribosomes and vacuoles also are in all plant cells as provide it with nutrients. Lysosme are not always commonly found in all plant cells because they have cell walls to proctect them. Hope this helps :)

Main Answer: The work function of electrons to this metal is

φ = (calculated value of E_photon) - 0.83 eV , in electron volts.

Supporting Question and Answer:

How can the work function of a metal be determined using the maximum kinetic energy of ejected electrons and the wavelength of incident light?

The work function of a metal can be determined by subtracting the maximum kinetic energy of ejected electrons from the energy of photons corresponding to the incident light, which can be calculated using the equation E(photon) = h × c / λ.

Body of the Solution:To find the work function of the metal, we can use the equation that relates the energy of a photon to the work function and the kinetic energy of ejected electrons.

The energy of a photon (E_photon) is given by the equation:

E_photon = h ×c / λ

Where h is the Planck's constant (approximately 4.136 x 10^(-15) eV·s), c is the speed of light (approximately 3 x 10^8 m/s), and λ is the wavelength of the light in meters.

First, let's convert the given wavelength of violet light from nanometers to meters:

λ = 390 nm = 390 x 10^(-9) m

Now, we can calculate the energy of a photon:

E_photon = (4.136 x 10^(-15) eV·s * 3 x 10^8 m/s) / (390 x 10^(-9) m)

Next, we need to find the work function (φ) of the metal. The work function represents the minimum energy required to remove an electron from the metal.

The maximum kinetic energy (KEmax) of the ejected electrons is given as 0.83 eV. The relationship between the energy of a photon, the work function, and the maximum kinetic energy is:

E_photon - φ = KEmax

We can rearrange the equation to solve for the work function:

φ = E_photon - KEmax

Substituting the calculated value of E_photon and the given value of KEmax:

φ = (calculated value of E_photon) - 0.83 eV

Solving this equation will give us the work function of the metal in electron volts.

Final Answer: Therefore,the work function of electrons to this metal is

φ = (calculated value of E_photon) - 0.83 eV , in electron volts.

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The work function of electrons to this metal is

φ = (calculated value of E_photon) - 0.83 eV , in electron volts.

The work function of a metal can be determined by subtracting the maximum kinetic energy of ejected electrons from the energy of photons corresponding to the incident light, which can be calculated using the equation E(photon) = h × c / λ.

To find the work function of the metal, we can use the equation that relates the energy of a photon to the work function and the kinetic energy of ejected electrons.

The energy of a photon (E_photon) is given by the equation:

E_photon = h ×c / λ

Where h is the Planck's constant (approximately 4.136 x 10^(-15) eV·s), c is the speed of light (approximately 3 x 10^8 m/s), and λ is the wavelength of the light in meters.

First, let's convert the given wavelength of violet light from nanometers to meters:

λ = 390 nm = 390 x 10^(-9) m

Now, we can calculate the energy of a photon:

E_photon = (4.136 x 10^(-15) eV·s * 3 x 10^8 m/s) / (390 x 10^(-9) m)

Next, we need to find the work function (φ) of the metal. The work function represents the minimum energy required to remove an electron from the metal.

The maximum kinetic energy (KEmax) of the ejected electrons is given as 0.83 eV. The relationship between the energy of a photon, the work function, and the maximum kinetic energy is:

E_photon - φ = KEmax

We can rearrange the equation to solve for the work function:

φ = E_photon - KEmax

Substituting the calculated value of E_photon and the given value of KEmax:

φ = (calculated value of E_photon) - 0.83 eV

Solving this equation will give us the work function of the metal in electron volts.

Therefore, the work function of electrons to this metal is

φ = (calculated value of E_photon) - 0.83 eV , in electron volts.

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Answer:

A national park is one such protected area for the special species of flora and fauna of the region. In Nepal, there are numerous national parks to conserve and protect wildlife and their natural habitat.

The measurement of electrical pressure is voltage, and the symbol for voltage in Ohm's Law is "V."

Ohm's Law states that the voltage (V) across a conductor is equal to the product of the current (I) flowing through the conductor and the resistance (R) of the conductor:

V = I * R

In this equation, "V" represents the voltage in volts, "I" represents the current in amperes, and "R" represents the resistance in ohms.

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To reach the appropriate water temperature, a 2.5 kilowatt resistance heater in a water heater runs for 3 hours. Therefore, the water heater consumes 7.5 kWh and 7500 kJ of electric energy.

The following formula may be used to calculate the quantity of electrical energy used in kWh and kJ:

Power (kW) x Time = Energy (kWh) (hours)

Energy (kJ) is equal to 1000 kWh of energy.

Considering that a 2.5 kW, 3-hour resistance heater:

2.5 kW times three hours is 7.5 kWh of energy.

Energy (kJ) equals 7.5 kWh times 1,000, or 7500 kJ.

Therefore, the water heater consumes 7.5 kWh and 7500 kJ of electric energy.

Remember that 1 kWh equals 1000 kJ, therefore multiplying the energy in kWh by 1000 yields the energy in kJ.

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e = W/Q(h)

e = 400/1,200 = 0.3333

Answer: 33%

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Wealthier people are more likely to be overrepresented among voters who turn out for the election.

Every second even-numbered year, there are national elections. Elections are held every four years for the president, vice president, a third of the Senate, and the entire House (on-year elections). One-third of the Senate and the entire House is up for election in even-numbered years when there isn't a presidential election (off-year elections). The National Voter Registration Act of 1993 is one example of a federal law that has been used to try and increase voter participation. In the United States, elections are held for representatives at the federal, state, and local levels of government. At the federal level, the president is chosen by the citizens of each state indirectly through the Electoral College.

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Answer:

to find the weight, use the following formula

F= m x g

in Earth---> 45 x 9.8= 441 N

in Moon---> 45 x 1.6= 72 N

Explanation:

I HOPE THIS HELPS!!! :)

The change in gravitational potential energy of a 45 kg weight that is moved from 2 m to 18 m on Earth and Moon are 7.056kJ and 1.152kJ respectively.

Gravitational potential energy is defined as the energy possessed by or acquired by an object due to a change in its position when it is present in a gravitational field. This can be said that gravitational potential energy is the energy which is related to the gravitational force or gravitation.

Gravitational potential energy is expressed as

U=m g h

Where, U = gravitational potential energy

m = mass

g = gravitational field

h = height

For above given example,

The change in gravitational potential energy for Earth

mass= 45kg

Difference in height \((H_2-H_1)\)= 18-2= 16m

g= \(9.8m/s^2\)

U= 45*16*9.8 = 7056J or 7.056kJ

The change in gravitational potential energy for Moon

mass= 45kg

Difference in height \((H_2-H_1)\)= 18-2= 16m

g= \(1.6m/s^2\)

U= 45*16* 1.6= 1152J or 1.152kJ

Thus, the change in gravitational potential energy of a 45 kg weight that is moved from 2 m to 18 m on Earth and Moon are 7.056kJ and 1.152kJ respectively.

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Answer: F=kq1q2/r2

"F" is the resulting force between the two charges. The distance between the two charges is "r." The "r" actually stands for "radius of separation" but you just need to know it is a distance. The "q1" and "q2" are values for the amount of charge in each of the particles.

Explanation:

The mathematical equation for the electric force between two charges will be ,\(\rm F = \frac{K q_1q_2}{r^2}\). It is a type of attractive force.

The electric force between the two charges is directly proportional to the product of the charge and inversely proportional to the square of the distance between them.

The electric force is found as;

\(\rm F = \frac{K q_1q_2}{r^2}\)

q₁ is the magnitude of charge 1

q₂ is the magnitude of charge 2

k is the proportionality constant

r is the separated distance

F is the electric force

Hence, the mathematical equation for the electric force between two charges will be ,\(\rm F = \frac{K q_1q_2}{r^2}\)

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Since Alejandro hopes to combine the findings from the collected studies and draw a general conclusion regarding the subject, he is using statistical tool of inference.

There are basically 2 types of statistical tools:

Descriptive tools are used to describe data. They include the use of tables, graphs, measures of dispersion, measures of central tendencies, etc.

Inferential tools are used to deduce conclusions from data. They include measures of significant differences, probability, correlation and regression, etc.

In this case, Alejandro would need to subject the data collected from the 35 studies to inferential statistical analysis tools in order to be able to make relevant conclusions.

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The time of motion of the car before coming to a full stop is 6.67 s.

The car length that should be kept between you and the car is 138.33 m.

The given parameters;

The time of motion of the car before coming to a full stop is calculated as follows;

\(v = u + at\\\\when \ the \ car \ stops , \ v = 0\\\\0 = u + at\\\\0 = 40 -6t\\\\6t = 40\\\\t = \frac{40}{6} = 6.67 \ s\)

The distance traveled by the car before coming to a full stop;

\(v^2 = u^2 + 2as\\\\0 = u^2 + 2as\\\\0 = 40^2 -2(6)s\\\\0 = 40^2- 12s\\\\12s = 1600\\\\s = \frac{1600}{12} \\\\s = 133.33 \ m\)

The car length that should be kept between you and the car is calculated as;

car length in front of you = 5 m + 133.33 m = 138.33 m

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Answer:

Velocidad.

Explanation:

Físicamente hablando, la velocidad es la distancia recorrida por unidad de tiempo. En el caso de las ondas se trata de la distancia recorrida en un período de tiempo.

Por ende, la opción correcta es: Velocidad.