Is light reflected off the floor or a table polarized?.

An inactive electrode can be made from a plastic rod, a rubber policeman, and a glass stir rod.

Inactive electrodes are used in electrochemical reactions to complete the electrical circuit with the active electrode. These electrodes do not participate in the reaction and are typically made of materials that do not react with the solution or produce any unwanted products. Platinum wire and carbon rod are examples of active electrodes that can participate in the reaction.

Plastic rods, rubber policemen, and glass stir rods are all non-conductive materials that can be used to make inactive electrodes. They do not conduct electricity and do not react with the solution, making them suitable for use as electrodes in electrochemical reactions. Plastic and rubber are particularly useful as they can be easily shaped into different forms to suit the requirements of the experiment.

In conclusion, a plastic rod, a rubber policeman, and a glass stir rod can be used to make inactive electrodes. These materials are non-conductive and do not react with the solution, making them suitable for use in electrochemical reactions. Platinum wire and carbon rods should be avoided as they are active electrodes that can participate in the reaction.

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The work done by the system is 486 kJ.

The work done in a system is calculated by subtracting the change in internal energy from the heat added.

In this case, the heat added is 722 kJ and the change in internal energy is +236 kJ, so the work done is equal to 722 - 236 = 486 kJ.

To explain this in further detail, we need to understand the concept of energy. Energy is defined as the capacity to do work. There are two forms of energy, namely, heat (thermal) energy and mechanical (or work) energy.

Heat energy is the form of energy that flows from a hot body to a cold body, while mechanical energy is the energy associated with the motion of an object or the position of an object within a force field.

When heat is added to a system, it results in a change in the internal energy of the system. This change in the internal energy is due to an increase in both the thermal energy and the mechanical energy within the system.

As heat energy is added, the molecules within the system move faster, increasing their thermal energy.

The increased thermal energy then causes the molecules to interact with one another, resulting in the system doing work, which increases the mechanical energy.

Therefore, when 722 kJ of heat is added to a system, resulting in a change in internal energy of +236 kJ, the work done by the system is 486 kJ.

This is because the increase in the mechanical energy within the system, as a result of the work done by the molecules, is equal to the change in the internal energy of the system.

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1) Note that the Roof is dark colored. Given the laws of physics, it will absorb all light.

2) the window is transparent, hence, it will transmit ALL light.

3) the door is dark-colored but has some glass on it. Thus, it will absorb MOST but not all light.

4) the side of the building which is painted white will reflect all light.

Note that dark surfaces absorb light because they are able to absorb photons, or particles of light, and convert them into other forms of energy.

This is because the atoms and molecules in dark surfaces have a large number of unpaired electrons that are able to absorb the energy of photons and transition to a higher energy state.

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Answer:

96.3%

Explanation:

Efficiency = Work input/Work output * 100%

Work done = Force * distance\

Work done by the engine is the work output = 700 * 0.55

Work output = 423.5Nm

Work done by you is the work input = 35.7*11.43

Work input = 408.051Nm

Efficiency = 408.051/423.5 * 100

Efficiency = 0.963 * 100

Efficiency = 96.3%

Hence the efficiency of the pulley system is 96.3%

Mass of the saturn = 5.683 × 10^26 Mass of the mercury = 3.285 × 10^23

Answer:

Planet Mass (in kilograms)

Saturn 5.685 · 1026

Planet Mass (in milligrams)

Saturn 5.685 · 1032

Explanation:

Answer:

E = K Q / R^2

E1 = K Q1 / R1^2 = K * (-6.39 E-9) / .4^2 = -K 39.9 E-9

E2 = K Q2 / R2^2 = K * 3.22 E-9 / .25^2 = K 51.5 E-9

Field will point to right of P since E2 (positive) stronger

E = K (E2 - E1) = 9.0 E9 * (51.5 - 39.9) E-9 = 104 N/C

The electric field at point P is 104.6 N/C.

Every place in space where a charge exists in any form has an electric attribute that can be defined as the electric field.

Here,

q₁ = -6.39 x 10⁻⁹C

q₂ = 3.22 x 10⁻⁹C

Distance from q₁ to P, d₁ = 0.4 m

Distance from q₂ to P, d₂ = 0.25 m

Electric field at P due to q₁, E₁ = k x -6.39 x 10⁻⁹/(0.4)²

E₁ = -39.9 x 10⁻⁹k N/C

Electric field at P due to q₂, E₂ = k x 3.22 x 10⁻⁹/(0.25)²

E₂ =51.52 x 10⁻⁹k N/C

Therefore, total electric field at P,

E = E₂ - E₁

E = (51.52 - 39.9) x 10⁻⁹k

E = 104.6 N/C

Hence,

The electric field at point P is 104.6 N/C.

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An icicle shrinks in size when the temperature drops because the water molecules within the icicle lose energy and move closer together, causing the icicle to contract. To determine the amount by which the icicle shrinks at a temperature of -26°C, we need to consider the thermal expansion coefficient of ice.

The thermal expansion coefficient of ice is approximately 51 x 10^(-6) per degree Celsius. This means that for every degree Celsius decrease in temperature, ice contracts by 51 x 10^(-6) of its original size.

If we assume that the icicle is made entirely of ice and has an initial length of L millimeters, the contraction in millimeters can be calculated using the following formula:

Contraction = L * (T2 - T1) * α

Where:

L is the initial length of the icicle,

T1 is the initial temperature (assumed to be 0°C),

T2 is the final temperature (-26°C),

α is the thermal expansion coefficient of ice.

Plugging in the values, we have:

Contraction = L * (-26) * 51 x 10^(-6)

Simplifying the equation, we get:

Contraction = -1.326 L

Therefore, the icicle would shrink by approximately 1.326 times its original length at a temperature of -26°C.

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Based on the graph, it appears that the species most likely to be affected if the water temperature increases from 74°F to 80°F would be the rainbow trout.

It is because the graph shows that rainbow trout have a much narrower range of temperature tolerance compared to the other species listed, such as bass and catfish. While bass and catfish can tolerate temperatures up to 90°F, rainbow trout can only tolerate temperatures up to around 68°F.

As the water temperature increases beyond 68°F, the health and survival of rainbow trout are likely to be negatively impacted, making them more vulnerable to the effects of increasing water temperature. Therefore, if the water temperature were to increase from 74°F to 80°F, it would be expected to have a significant impact on the population of rainbow trout in the ecosystem.

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Answer:

Cheers

The stars that can be classified in spectral class A are the Red giants with an absolute magnitude of 0 and Blue giants with a temperature of 10,000 K

Stars can be classified based on their luminosity and temperature.

From the given graph, the various classification of stars include the following;

At the given spectral class A from the graph, the following stars can be found;

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Answer:

The ball takes \($t=1 \cdot 917sec$\) to hit the ground.

Explanation:

• The second equation of motion represents the total distances travelled by an object in a time interval of \($\Delta t$\) with an initial speed of \($u$\) and acceleration \($a$\).

• To find the time, ball takes to hit the ground, use the formula: \($$s = ut + \frac{1}{2}a{t^2}$$\)

Where, \($t$\) is time, \($u$\) is initial velocity, \($a$\) is acceleration and\($s$\) is displacement.

• In this case, \($a = g = 9 \cdot 8m/se{c^2}$\).

• Placing the value of the given initial velocity, \($u=0cm/s$\) and displacement,\($s = 13m$\) in the above formula.

\(& \therefore s = ut + \frac{1}{2}g{t^2} \\& \Rightarrow 13 = 0 \cdot t + \frac{1}{2} \times 9 \cdot 8 \times {t^2} \\\)

\(& \Rightarrow 13 = 4 \cdot 9{t^2} \\& \Rightarrow {t^2} = \frac{{13}}{{4.9}} \\& \Rightarrow t = 1 \cdot 917sec \\\end{align}\]\)

• Hence, ball takes \($t=1 \cdot 917sec$\) to hit the ground.

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Answer:

you could become a science teacher and if you do english literature too then an english teacher

Explanation:

you will  just need to get good GCSEs and if you want to you can further your education. e.g, college, university.

Answer:

F(m)= mg(m)

m=F(m)/g(m)=72/1.6=45kg

F(e)= mg(e)= 45 x 10 m/s= 450N

The power generated by the sprinter is 490 J/s.

We need to know power first to solve this problem. Power is a unit that measures how much energy is released in one second. Power can be determined as

P = W / t

where P is power, W is work and t is time.

The work can be determined as the change of kinetic energy

W = 1/2 . m . (v1² - vo²)

where m is the mass and v is velocity.

From the question above, we know that:

m = 60 kg

vo = 0 m/s

v1 = 7 m

t = 3 s

By substituting the parameters, we get

P = W / t

P = 1/2 . m . (v1² - vo²) / 3

P = 1/2 . 60 . (7² - 0²) / 3

P = 490 J/s

Hence, the power generated by the sprinter is 490 J/s.

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The first-order maximum for 425-nm wavelength blue light falling on double slits separated by 0.0520 mm occurs at an angle of approximately 84.48 degrees.

To calculate the angle at which the first-order maximum occurs for blue light with a wavelength of 425 nm (nanometers) falling on double slits separated by 0.0520 mm (millimeters), we can use the formula for the angle of diffraction:

sin(θ) = m * (λ / d)

where:

θ is the angle of diffraction,

m is the order of the maximum,

λ is the wavelength of light, and

d is the separation between the slits.

First, we need to convert the given measurements to SI units:

Wavelength, λ = 425 nm = 425 × \(10^{-9\) m

Separation between slits, d = 0.0520 mm = 0.0520 × \(10^{-3}\) m

Now we can calculate the angle of diffraction:

sin(θ) = m * (λ / d)

sin(θ) = 1 * (425 ×  \(10^{-9\) m / 0.0520 ×  \(10^{-3}\) m)

Calculating the value inside the parentheses:

425 ×  \(10^{-9\) / 0.0520 ×  \(10^{-3}\) = 8.173

Now, to find the angle θ, we can take the inverse sine (arcsine) of this value:

θ = arcsin(8.173)

Using a calculator, the value of arcsin(8.173) is approximately 84.48 degrees.

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Answer:

Option C is correct. The ball keeps moving forward and falls downward at the same time.

Explanation:

When the ball reaches the edge of the cliff, its forward motion will indeed continue due to its inertia. Inertia is the property of an object to maintain its state of motion. However, gravity will also be acting on the ball, causing it to accelerate downward.

As a result, the ball will move forward and descend downward at the same time. The trajectory of the ball will be a curved path that combines the horizontal motion (forward movement) and the vertical motion (downward fall) simultaneously. This curved path is known as a parabolic trajectory.

The exact shape of the trajectory will depend on factors such as the initial velocity, angle of the cliff, and air resistance. If there is no air resistance and the cliff is not too steep, the ball's trajectory may resemble a smooth parabolic curve. However, if there is air resistance or the cliff is steep, the trajectory might deviate from a perfect parabola.

Eventually, due to the downward acceleration caused by gravity, the ball's vertical motion will dominate, and it will fall straight down. But immediately after reaching the edge of the cliff, the ball will experience a combination of forward motion and downward descent.

The scenario that best describes a relationship of commensalism is :

Birds feed off the insects that are stirred up from the grasses as cattle move through.

Commensalism is described as a long-term biological interaction in which members of one species gain benefits while those of the other species neither benefit nor are harmed.

A polar bear catches a seal for dinner is not a case of commensalism because the case of members of one species gain benefits while those of the other species neither benefit nor are harmed is not fulfilled here.

A tapeworm latches itself in the intestines of a rat, feeding off all the nutrients eaten by the rat is not a case of commensalism because the case of members of one species gain benefits while those of the other species neither benefit nor are harmed is not fulfilled here.

Hence, the scenario that best describes a relationship of commensalism is :

Birds feed off the insects that are stirred up from the grasses as cattle move through because  because the case of members of one species gain benefits while those of the other species neither benefit nor are harmed is fulfilled here.

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Complete question:

Which scenario describes a relationship of commensalism?

O A polar bear catches a seal for dinner.

O xpecker birds eat parasitic ticks off the backs of zebras.

O Atapeworm latches itself in the intestines of a rat, feeding off all the nutrients eaten by the rat.

O Birds feed off the insects that are stirred up from the grasses as cattle move through.

‘Wave’ is a common term for a number of different ways in which energy is transferred:

In electromagnetic waves, energy is transferred through vibrations of electric and magnetic fields.

In sound waves, energy is transferred through vibration of air particles or particles of a solid through which the sound travels.

In water waves, energy is transferred through the vibration of the water particles.

Both are dangerous on their own, but as they float through the air in Southern California's sunny climate, the sun bakes them into a new molecule called ozone, better known as smog.

Smog development and infiltration over Los Angeles. haze and air pollution in the entire community.

Burning sulfur-containing fossil fuels, particularly coal, causes sulfurous smog, also referred to as "London smog," which is characterized by a high concentration of sulfur oxides in the atmosphere.

The two primary substances in automotive exhaust are nitrogen oxides, which are created in scorching internal combustion engines, and hydrocarbons, which are derived from gasoline.

Therefore, Both are dangerous on their own, but as they float through the air in Southern California's sunny climate, the sun bakes them into a new molecule called ozone, better known as smog.

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Answer:

answer is b. any movement that uses your muscles and requires energy

Explanation:

Answer:

The maximum height is determined by the initial vertical velocity. Since steeper launch angles have a larger vertical velocity component, increasing the launch angle increases the maximum height.

Explanation:

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Answer:

1.6 m/s²

Explanation:

Weight equals mass times acceleration due to gravity.

F = mg

14.4 N = (9 kg) g

g = 1.6 m/s²

You should give him the Brainliest.

Answer:

A microwave with a frequency of 5*10¹⁰ hertz has a period of 2*10⁻¹¹ seconds.

Explanation:

Frequency is the number of vibrations that occur in a unit of time. Its unit is s⁻¹ or hertz (Hz).

The period is the time that elapses between the emission of two consecutive waves. In other words, it is the time it takes for a complete wave to pass a reference point. The period (T) is simply the inverse of the frequency (f):

\(T=\frac{1}{f}\)

In this case, f=5*10¹⁰ Hz. So, replacing in the definition of period T:

\(T=\frac{1}{5*10^{10} Hz }\)

Solving:

T= 2*10⁻¹¹ seconds

A microwave with a frequency of 5*10¹⁰ hertz has a period of 2*10⁻¹¹ seconds.

A microwave with a frequency of 5*10¹⁰ hertz has a period of 2*10⁻¹¹ seconds.

The fequency is defined as the number of cycles achieved by the any wave it is expressed in hertz.

Frequency is the number of vibrations that occur in a unit of time. Its unit is s⁻¹ or hertz (Hz).

The period is the time that elapses between the emission of two consecutive waves. In other words, it is the time it takes for a complete wave to pass a reference point. The period (T) is simply the inverse of the frequency (f):

\(T=\dfrac{1}{f}\)

In this case, f=5*10¹⁰ Hz. So, replacing in the definition of period T:

\(T=\dfrac{1}{5\times 10^{10}}=2\times 10^{-11}\ Sec\)

A microwave with a frequency of 5*10¹⁰ hertz has a period of 2*10⁻¹¹ seconds.

Thus a microwave with a frequency of 5*10¹⁰ hertz has a period of 2*10⁻¹¹ seconds.

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Thrust force of the rocket is, T = 2.264 MN

Thus, the force required to move the rocket through the air is 2.264MN. This force is generated because of Newton's third law of motion.

Thrust is the force which moves the rocket through the air, and through space. Thrust is generated by the application of Newton's third law of motion; "For every action there is an equal and opposite re-action. "

The formula for calculating, thrust force of the rocket is T= vdm/dt

Where, T is the thrust of the rocket

v is th relative speed = 8km/s (given in question)

dm/dt is the mass flow rate = 283kg/s (given in question)

Substituting the values,

T = 8km/s × 1000m/1km × 283kg/s

= 2.264 (10^6N=2.264MN)

Therefore, main answer is that

Thrust force is, T = 2.264 MN

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Given:

The mass of the car is m = 1725 kg

The initial velocity of the car is

The final velocity of the car is

The time is t = 4.4 s

To find the applied force.

Explanation:

The force can be calculated by the formula

Here, a is the acceleration.

The acceleration can be calculated as

On substituting the values, the force applied will be

Thus, the applied force is 3527.625 N

The hertz (Hz) is the SI frequency unit named after the German physicist Heinrich Hertz; one hertz means that an event occurs once every second.

The frequency of a repeating event is the number of occurrences per unit of time. It is distinct from angular frequency and is sometimes referred to as temporal frequency. The unit of frequency is hertz, which equals one event per second. The number of waves that pass through a fixed point in a given amount of time is described by frequency. So, if a wave takes half a second to pass, the frequency is 2 per second. The frequency is 100 per hour if it takes 1/100 of an hour.

Here,

The hertz (Hz) is the SI unit of frequency, named after the German physicist Heinrich Hertz; one hertz means that an event occurs once every second.

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The size of the shadow hangs on the distance of the source of light and on the angle at which the light rays drop on the object.

A person or object chunks more light when the sun is low in the sky. More brick light makes shadows longer. Less light is wad when the sun is high in the sky. This makes shadows shorter. The angle at which light hit an object affects the size and shape of its shadow. Shadows are longer when the light source is at a low angle (side on) and squat when the light source is at a higher angle (overhead). find design when investigating how shadows change size and how a shadow is formed understand the role of light-position

So we can conclude that The Sun's position in the sky influences the length of the shadow. When the Sun is low on the horizon, the shadows are long.

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Answer:

The law which describes the behavior of gases in the Sun is Gay-Lussac's Law

Explanation:

The states that the extremely high pressure of the gases in the Sun produces extremely high temperature;

Therefore, the relationship between the pressure, 'P', of the gas and the temperature, 'T', of the gas is a direct relationship, which can be expressed mathematically as follows;

P ∝ T

The law which best describes the behavior of gases in the Sun is Gay-Lussac's Law, which states that the pressure of a given volume of gas varies directly as the absolute temperature of the gas, as follows;

P = K·T

∴ P/T = K (Constant)

\(\therefore \dfrac{P_1}{T_1} = \dfrac{P_2}{T_2}\)