What is the speed of a wave that has a frequency of 250Hz and a Wavelength of 1.5 m?

A candle placed 2.62 meters from the a concave mirror with something like a radius of curvature approximately 0.62 meters illuminates the mirror. The image is 0.73 meters away.

A form with an inward curvature is said to be concave. Concave shapes include those like the sideview mirrors of the a car, which curls inward. When a shape curves outward, it is said to be convex. One excellent example of such a convex form is the outward-curving American football.

One that veers inward at a single point is said to have a concave shape. A polygon with the a steep inward angle or a curved form with an inwardly curving part can both fit the bill. When a line connects two points inside a shape and leaves the shape at an angle, the shape is said to be concave.

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Answer:

It is because the load is in between fulcrum and effort making a longer effort arm than the load arm resulting to multiplication of force and a mechanical advantage of greater than 1.

Explanation:

The distance from the fulcrum to the effort is the effort arm where as the distance from the fulcrum to the load is the load arm.

The first class lever has a mechanical advantage that varies per the position of the load with respect to effort position from the fulcrum. They have the fulcrum at the middle. For example, a beam balance and a pliers. The formula to remember is FLE for easy categorization of the lever classes.

The second class lever , the load is at the middle.For example a wheel barrow and a bottle opener. In this class, the effort arm is longer than the load arm.The effort is force multiplication making the mechanical advantage to be greater than 1.

The third class of lever has effort in the middle.For example a spade or a knife.In this class effort arm is shorter than the load arm, causing change in direction of force. The effect is a mechanical advantage less than 1.

Given :-

To Find :-

Solution :-

As we know that ,

→ Pressure = Force/ Area

If Force is constant, then ,

→ P inversely proportional to Area

→ P = k/A

→ PA = k

We can also write it as ,

→ P₁ A₁ = P ₂ A₂

Here ,

→ A₂ = A₁/2

so that;

→ A₁ * 80,000 Pa = A₁/2 * P ₂

→ P ₂ = 80000Pa *2

→ P ₂ = 160000 Pa

Hence the required answer is 160,000 Pa .

Aerobic exercise helps you lose weight and keep it off when combined with a good diet.

When you first begin regular aerobic exercise, you could feel exhausted. But over time, you'll benefit from more endurance and less weariness.

Over time, you can also improve your bone and muscle strength as well as your heart and lung health.

Regular aerobic exercise like walking, cycling, or swimming can improve your health and length of life.

You repeatedly contract your arms, legs, and hip muscles when engaging in aerobic exercise. You'll become aware of your body's reactions immediately.

You'll deepen and speed up your breathing. The amount of oxygen in your blood is increased as a result. As a result of your heart beating more quickly, more blood will reach your muscles and return to your lungs.

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The equations of the lines in fully simplified slope-intercept form are

The linear graph represents the given parameter

For the first graph, we have the points

(0, -2) and (1, 1)

A linear equation is represented as

y = mx + c

Where

c = y when x = 0

So, we have

y = mx - 2

Using the point (1, 1) on y = mx - 2, we have

m(1) - 2 = 1

m - 2 = 1

Evaluate

m = 3

So, we have

y = 3x - 2

Using the above as a guide, we have the following equations for the other graphs

Graph 2: y = -4x + 2

Graph 3: y = -x - 2

Graph 4: y = 3/2x + 1

Graph 5: y = -2x + 2

Graph 6: y = x

Hence, the equation of the first line in fully simplified slope-intercept form is y = 3x - 2

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Answer:

15.3

+1.285

---------------

Answer = 16.585

The synonym of a word( observe, infer, repetition, replication and data) means another word that is nearest in meaning to the given word.

The synonym of the words given from the question is given below:

Therefore, synonym of a word means another word that is nearest in meaning to the given word.

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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

Answer:

0.675

Explanation:

hope you get it right

Answer:

\(0.675\:\mathrm{s}\)

Explanation:

Displacement can be given as \(\Delta x=v_x\cdot t\)

Substituting given values, we have:

\(27=40t,\\t=\frac{27}{40}=\boxed{0.675\:\mathrm{s}}\)

The potential difference across the 20.0 μF capacitor is the same as the potential difference between points a and b, which is 13.0 V. Therefore, Q = 20.0 μF × 13.0 V = 260 μC.

The equivalent capacitance between points a and b can be found using the formula 1/Ceq = 1/C1 + 1/C2 + 1/C3 + 1/C4, where C1, C2, C3, and C4 are the capacitances of the four capacitors. Substituting the values given in the problem, we get:

1/Ceq = 1/10.0 μF + 1/3.00 μF + 1/20.0 μF + 1/6.00 μF

1/Ceq = 0.1 + 0.333 + 0.05 + 0.167

1/Ceq = 0.65

Ceq = 1/0.65

Ceq = 5.98 μF

Therefore, the equivalent capacitance between points a and b is 5.98 μF.

To calculate the charge on each capacitor, we can use the formula Q = CΔV, where Q is the charge on the capacitor, C is the capacitance, and ΔV is the potential difference across the capacitor. The potential difference between points a and b is given as 13.0 V in the problem.

For the 20.0 μF capacitor, Q = 20.0 μF × 13.0 V = 260 μC.

For the 6.00 μF capacitor, Q = 6.00 μF × 13.0 V = 78 μC.

For the 3.00 μF capacitor, Q = 3.00 μF × 13.0 V = 39 μC.

For the C capacitor, Q = 5.98 μF × 13.0 V = 77.7 μC (since this is the equivalent capacitance between points a and b).

To calculate the charge on the 20.0 μF capacitor specifically, we can again use the formula Q = CΔV.

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Answer:

This is the twin paradox.

To calculate the percentage of reflected wave power in the parallel and perpendicular polarizations, we can use the Fresnel equations. The Fresnel equations describe the reflection and transmission of light at the interface between two media with different refractive indices.

For the given scenario:

- Angle of incidence (θi) = 45 degrees

- Dielectric constant of water (εr) = 1.78

a) Percentage of reflected wave power in the parallel polarization:

Using the Fresnel equations, the reflection coefficient for parallel polarization (r_parallel) is given by:

r_parallel = [(cos(θi) - √(εr - sin^2(θi)))/(cos(θi) + √(εr - sin^2(θi)))]^2

Substituting the given values:

r_parallel = [(cos(45°) - √(1.78 - sin^2(45°)))/(cos(45°) + √(1.78 - sin^2(45°)))]^2

Simplifying the equation, we find:

r_parallel = (1 - √(1.78 - 0.5))/(1 + √(1.78 - 0.5))^2

Calculating the value, we get:

r_parallel ≈ 0.0267

The percentage of reflected wave power in the parallel polarization is:

Percentage = r_parallel * 100

Percentage ≈ 2.67%

b) Percentage of reflected wave power in the perpendicular polarization:

Using the Fresnel equations, the reflection coefficient for perpendicular polarization (r_perpendicular) is given by:

r_perpendicular = [(εr * cos(θi) - √(εr - sin^2(θi)))/(εr * cos(θi) + √(εr - sin^2(θi)))]^2

Substituting the given values:

r_perpendicular = [(1.78 * cos(45°) - √(1.78 - sin^2(45°)))/(1.78 * cos(45°) + √(1.78 - sin^2(45°)))]^2

Simplifying the equation, we find:

r_perpendicular = (1.78 * cos(45°) - √(1.78 - 0.5))/(1.78 * cos(45°) + √(1.78 - 0.5))^2

Calculating the value, we get:

r_perpendicular ≈ 0.9733

The percentage of reflected wave power in the perpendicular polarization is:

Percentage = r_perpendicular * 100

Percentage ≈ 97.33%

c) If the polarized sunglasses screen out horizontally polarized light, we need to consider the percentage of vertically polarized light that passes through the glasses.

From part (b), we found that approximately 97.33% of the reflected wave power is in the perpendicular polarization. Since the perpendicular polarization is vertically polarized, the percentage of sunlight power density that gets through the glasses would be:

Percentage = 97.33%

Percentage ≈ 97.33%

Therefore:

a) The percentage of reflected wave power in the parallel polarization is approximately 2.67%.

b) The percentage of reflected wave power in the perpendicular polarization is approximately 97.33%.

c) The percentage of sunlight power density that gets through the polarized sunglasses is approximately 97.33%.

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Answer:

i really dont know

Explanation:

????

Answer:

Mac’s Speed = 2.5 m/s

Tosh’s Speed = 4 m/s

Tosh moves 1.5 m/s faster than Mac.

Explanation:

Tosh starts from an initial position of 12m and in a span of 3 seconds, (1.00 seconds to 4.00 seconds) he moves 12 meters.

So his speed is distance / time

s = 12 / 3

s = 4 m/s

Mac starts from an initial position of 2m and in a span of 4 seconds, he traveled 10m (2.00m to 12.00m).

Speed = Distance / time

s = 10 / 4

s = 2.5 m/s

The energy transferred by an appliance using mains electricity is 34500 Joule.

In physics, energy is the ability to perform work. It could exist in several different forms, such as potential, kinetic, thermal, electrical, chemical, radioactive, etc. Additionally, there is heat and work, which is energy being transferred from one body to another. Energy is always assigned based on its nature once it has been transmitted.

Given that: charge of the particle: Q = 150 C.

Potential difference applied: V = 230 V.

Hence, the potential energy of the particle: E = QV

= 150 × 230 Joule

= 34500 Joule.

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The pressure exerted by light on a mirror located at the same distance from the source, assuming normal incidence and total reflection is very small, approximately 10^-5 pascals.

When light is incident on a surface, it exerts a radiation pressure that is equal to the power of the light divided by the speed of light. This pressure is very small for everyday objects, but it can be significant for objects with very low mass, such as mirrors. In the case of a mirror that is perpendicular to the incident light, all of the light is reflected back in the opposite direction. This means that the total force on the mirror is twice the radiation pressure, but since the pressure is so small, the force is also very small. Therefore, the pressure exerted by light on a mirror located at the same distance from the source, assuming normal incidence and total reflection is approximately 10^-5 pascals.

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so the resulting force of all the 3 forces is 11.7 N.

As shown in the figure below ther is 3 forces \(F_1 ,F_2 ,F_3\) are the forces so that the diagram is along the directions given in the question

so \(F_1\) = 3 j^ ( where j^ is unit vector along y axis)

\(F_2\) = 6 cos 45  i^ + 6 sin 45 j^ ( where i^ is unit vector along x axis)

\(F_3\)  = - 5 sin 30 i^ + 5 cos 30 j^

so the resultant force = \(F_1+ F_2 +F_3\)

=> 3 j^ + 4.24 i^ + 4.24 j^ + 4.33 j^ - 2.5 i^

=> 1.74 i^ + 11.57 j^

so resultant force = \(\sqrt{1.74^2 + 11.57^2}\)

=> \(\sqrt{136.89}\)

=> 11.7 N

so the resulting force of all the 3 forces is 11.7 N

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Answer: True

Fraction of the light shining straight at a piece of clear glass is reflected from the first surface is 1/8.

Light is a form of energy that enables us to see the world around us. It is an electromagnetic radiation that is visible to the human eye. Light can be measured in various units such as lumens, lux, and candelas. Light waves are of different colors, and each color has a different wavelength.The reflection of light from a surface is called reflection. When light falls on a surface, it may be absorbed, transmitted, or reflected. Reflection of light is the property of a surface to reflect light. The reflection of light from a smooth surface is called specular reflection, and the reflection from an irregular surface is called diffuse reflection.Reflection of lightWhen a beam of light is reflected from a surface, the angle of incidence and the angle of reflection are equal. The angle of incidence is the angle between the incoming ray and the normal to the surface at the point of incidence. The angle of reflection is the angle between the reflected ray and the normal to the surface at the point of incidence.

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When a rock on a string is spun in a horizontal circle, the speed is doubled, quadrupling the tension in the string.

When the rope breaks, there is no force in the radial direction, thus the stone flies off tangentially because of inertia. Until the stone is attached to a string, the tension in the string causes centripetal force and centrifugal force along in radial direction of motion.

What is Tension in the string?

Tension is the force that is sent through a rope, string, or wire when two opposing forces pull on it. Along the whole length of the wire, the tension force pulls energy equally on the bodies at the ends.

Every physical object that comes into contact with another one exerts a force on it. These contact forces have names based on the types of things they are applied to. One of the forces exerted on an object, such as a rope, cable, or chain, is tension.

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The submarine is 26 m below the surface of fresh water. The density of sea water is 1.3 times the density of fresh water. The pressure due to fresh water at a depth of 26 m is 255660 Pa.

The pressure due to the sea water at a depth of 20 m can be calculated using the formula:

P = ρgh

where ρ is the density of the sea water, g is the acceleration due to gravity, and h is the depth of the submarine.

Assuming a density of sea water to be 1030 kg/m³ and g to be 9.81 m/s², we get:

P = 1030 x 9.81 x 20 = 202086 Pa

Now, to calculate the pressure due to fresh water at a depth of 26 m, we can use the same formula with the density of fresh water and the given depth:

P = ρgh

Assuming a density of fresh water to be 1000 kg/m³, and g to be 9.81 m/s², we get:

P = 1000 x 9.81 x 26 = 255660 Pa

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Answer :B: Bulbs B and C will remain lit.

If the switch is closed and Bulb A is removed, Bulbs B and C will remain lit. Option B is correct.

An electric bulb is a gadget that uses electricity to create visible light. It is the most popular type of artificial lighting and is necessary for modern society.

The light bulb is connected to a switch in a parallel configuration. The switch is open, which means there will be a lot of resistance and no current will flow via this route.

Across the parallel connection, the battery would create the same potential difference. Because the current would not go via the open switch, it would instead flow through the light bulb, causing it to illuminate.

If the switch is closed, the circuit get completed, hence the current starts flowing in the circuit and the bulb start glowing.

When one bulb in a series circuit is removed out, the rest of the bulbs stop shining and shut off.

But if bulb A is removed,in that condition the only connected bulb can glow. If the switch is closed and Bulb A is removed, Bulbs B and C will remain lit.

Hence, option B is correct.

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Charles's law means that the volume of a gas is directly proportional to its absolute temperature

Boyle's Law tells us that the volume of a gas increases as the pressure decreases. Charles's law tells us that the volume of a gas increases with increasing temperature

This is stated by Karl's law, also known as the law of volumes

For a dry gas sample, its volume and Kelvin temperature are directly proportional if the pressure is kept constant

 \(\begin{equation*} PV=nRT \end{equation*}\)           P : is a Pressure(Pa)

  \(\begin{equation*} V=\frac{nRT}{P} \end{equation*}\)              V : is volume (\(m^{3}\))

                              T : absolute temperature (K)

                              R : gas constant \(\begin{equation*} 8.314K^{-1}.mol^{-1} \end{equation*}\)

                               n : amount of substance of the gas (mole)

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Cribbing Materials is the tool which consists of wooden or plastic blocks or wedges in a variety of lengths and widths.

Buildings can be stabilised with stabilisation technologies in cases of traffic accidents, earthquakes, and fires. Any successful rescue method must include stabilisation since it is essential to both the casualties' and rescuers' safety. The stabiliser must be sturdy and dependable, constructed of high-quality materials, long-lasting, and easy to move or transfer.

Buildings or vehicles can be stabilised with the use of cribbing blocks made by Resqtec. The blocks are used to support the lifting of objects during rescue operations or to sustain the facility. It is simple to construct a variety of stabilisation structures thanks to the special locking plate mechanism. The underlying blocks' reversibility makes it possible to produce a flat surface that is excellent for lifting.

All stabilisation equipment from Resqtec is of the highest calibre possible because only a top-notch stabilisation or support system can guarantee the ideal level of safety for both the victims and the rescue crew. To ensure that the work surface is the right size, stabilization tools can be mixed and applied in as many ways as necessary.

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When Photons of wavelength 0.024 a are incident on free electrons, the wavelength of a photon which is scattered 30° is 0.0576 x \(10^{-11}\) and for the one scattering at 120° is 0.38 x  \(10^{-11}\) A.

The incident photon’s energy is equal to the scattered photon’s energy minus the total of the recoil electron’s kinetic energy and binding energy.

Compton scattering causes the loss of an electron and ionization of the absorbing atom, just like photoelectric absorption does.

After the scattering event and before, the photon’s wavelength varies by ∆λ = (h/mc) (1-cosφ). Here, c is the speed of light, m is the rest mass of the electron, and is the angle at which the photon is scattered. H is the Planck constant.

Given photon wavelength λ = 0.024A

φ = 30°

From the Compton effect we know that

∆λ = λ1 - λ = h/mc (1-cosφ)

λ1 = \(\frac{6.62*10^{-34}}{9.1}\) x \(10^{-3}\) x 3 x \(10^{8}\) (1- cos30°) + 0.024A

= 0.0576 x \(10^{-11}\) A

And then calculating the same for

φ = 120°

we get,

λ1 = 0.38 x  \(10^{-11}\)A

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Complete Question

Photons of wavelength 0.024A are incident on free electrons.

(a) Find the wavelength of a photon which is scattered 30° from the incident direction and the kinetic energy imparted to the recoil electron

(b) Do the same if the scattering angle is 120°.

Answer:

The ways to change the total energy are to either make the hill taller to increase it or make the hill lower to decrease the total energy.

Explanation:

The total mechanical energy of a system is the sum of the total kinetic energy and total potential energy.