block is sliding down on a frictionless incline. is its linear momentum conserved in any directions?

(a) The wavelength of these microwaves is approximately 1.2 cm. (b) As the holes in the microwave oven door are far smaller than the wavelength of the microwaves, microwaves cannot flow through them. (c) The size of the holes in the door is greater than the wavelength of visible light, allowing it to pass through.

(a) The wavelength of the microwaves can be calculated using the equation λ = c / f, where λ represents the wavelength, c is the speed of light, and f is the frequency. Given the frequency of 2.5 x 10¹⁰ Hz, and the speed of light of approximately 3 x 10⁸ m/s, we can calculate the wavelength as follows:

λ = (3 x 10⁸ m/s) / (2.5 x 10¹⁰ Hz)

λ ≈ 0.012 m or 1.2 cm

(b) Microwaves do not pass through the holes in the microwave oven door because the size of the holes is much smaller than the wavelength of the microwaves. The holes act as barriers for microwaves due to their dimensions being significantly smaller than the wavelength. As a result, the microwaves are unable to pass through the holes.

(c) Visible light, with wavelengths ranging from approximately 400 nm (violet) to 700 nm (red), would be able to pass through the holes in the microwave oven door. The holes are much larger than the wavelengths of visible light, allowing light to pass through with minimal obstruction. The size of the holes in the door is significantly larger than the wavelength of visible light, enabling its transmission through the holes.

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Answer:

the index of refraction of the coating is 1.33  

Explanation:

Given the data in the question;

refraction index of  interior portion of the rod η\(_{interior\) = 1.55

angle of incidence θ\(_i\) = 59.5°

From Snell's law, we know that;

η\(_{interior\) × sinθ\(_i\)  = η\(_{coating\) × sinθ\(_r\)

where η\(_{interior\)  is the index of refraction of the rod ( material 1 )

θ\(_i\)  is the angle of incidence

η\(_{coating\) is the index of refraction in outer coating ( material 2 )

θ\(_r\) is the angle of refraction

so we substitute our values into the equation;

η\(_{interior\) × sinθ\(_i\)  = η\(_{coating\) × sinθ\(_r\)

1.55 × sin( 59.5° )  = η\(_{coating\) × sin( 90° )

1.55 × 0.861629  = η\(_{coating\) × 1

1.3355 = η\(_{coating\) × 1

η\(_{coating\) = 1.33   { 2 decimal places }

Therefore, the index of refraction of the coating is 1.33  

The equation Jerry should use for the total resistance in a series circuit is R = R₁ + R₂ + R₃.

option A.

In a series circuit, all components are connected end-to-end, forming a single path for current flow.

A series circuit can contain any combination of resistors, capacitors, and inductors.

In a series circuit, the current flowing in each circuit component is the same  and the voltage drop in each circuit component is different.

Based on this, the total formula for the total resistance in a series circuit is given as;

R = R₁ + R₂ + R₃

where;

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Answer:

Flexibility is the ability of a joint or series of joints to move through an unrestricted, pain free range of motion. ... These soft tissues include: muscles, ligaments, tendons, joint capsules, and skin.

Explanation:

Answer:

false

Explanation:

false

its making ne type an answer that is 20 characyers long lol

If a dart shot at a monkey is traveling 6 m/s horizontally, while simultaneously traveling 9 m/s downward, then the total velocity of the dart would be 10.81 m /s.

The total displacement covered by any object per unit of time is known as velocity. It depends on the magnitude as well as the direction of the moving object.

As given in the problem a  dart shot at a monkey is traveling 6 m/s horizontally, while simultaneously traveling 9 m/s downward.

Total velocity of the dart = √ ( 6² + 9² )

                                         = 10.81 m /s

Thus, the total velocity of the dart would be 10.81 m /s.

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Correct option is:- C) Work is a measure of how much energy a force transfers.

Answer:

2m/s

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

Electric field between two parallel plates will be halved as it was before.

What is the electric field between two plates:

The electric field lines of two parallel plates can be represented by straight lines perpendicular to both plates surfaces while carrying arrows that point from +Q plate A toward -Q plate B.

we know that,

The electric field between plates:

E=V / d

where,

V is battery voltage

d is separation distance between plates.

now If the plates are pulled twice as far apart, but are kept connected to the battery,

the separation distance becomes,

d' = 2d

so the new electric field will be:

E' = V / d'

substituting the values,

E' = V / ( 2d )

E' = 1/2 ( V /d )

E' = 1/2 E

hence we can conclude that

Electric field between plates will be halved as it was before.

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Answer:

The package should be dropped 244.7 meters before the target

Explanation:

We need to find how long the package will take to hit the ground then solve for position.

y=0

-4.9t^2=-3000

t= sqrt (3000/4.9)

t= 24.74 seconds.

x= 247.4 meters.

To find the density of the silver, we'll first need to determine its volume. We can do this by using the apparent weight of the silver in water and the buoyant force formula.

The buoyant force equals the weight of the water displaced by the object, which is also equal to the difference between the object's actual weight and its apparent weight.
We know the apparent weight is 61.0 N and the mass of the silver is 6.88 kg. To find the actual weight, multiply the mass by the acceleration due to gravity (approximately 9.81 m/s^2):
Actual weight = 6.88 kg * 9.81 m/s^2 ≈ 67.5 N
Now, find the buoyant force:
Buoyant force = Actual weight - Apparent weight = 67.5 N - 61.0 N = 6.5 N
Next, we can find the volume of water displaced by dividing the buoyant force by the density of water (1.00 g/cm^3) and gravity (9.81 m/s^2):
Volume = (6.5 N) / (1.00 g/cm^3 * 9.81 m/s^2) ≈ 0.663 L
Since the volume of the water displaced is equal to the volume of the silver, we can now find the density of the silver by dividing its mass (6.88 kg) by its volume (0.663 L). First, convert the mass to grams:
6.88 kg * 1000 g/kg = 6880 g
Now, divide the mass by the volume:
Density = 6880 g / 0.663 L ≈ 10.38 g/cm^3
The closest answer to this value is option B, 10.5 g/cm^3.

A force that is generated upward by the water that an object displaces is known as buoyancy. It is directly proportional to the volume (weight) of water that is being displaced by an object, in accordance with Archimede's principle. Therefore, the force of buoyancy pushing an object up increases as an object displaces more water.

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Answer:

barometer

Explanation:

Answer:

barometer

Explanation:

Explanation:

d frequency I learned it last year

The number of wavelengths that pass a point each second is referred to as the frequency of a wave. The correct option is D.

Frequency is defined as the number of cycles (or wavelengths) that pass a point in one second and is measured in units of Hertz (Hz). For example, if a wave has a frequency of 10 Hz, it means that 10 complete cycles (or 10 wavelengths) pass a point in one second.

A transverse wave is a type of wave where the particles of the medium move perpendicular to the direction of the wave motion. Examples of transverse waves include light waves and electromagnetic waves.

Period refers to the time it takes for one complete cycle of a wave to occur. It is measured in units of seconds (s) and is the reciprocal of the frequency. So, period and frequency are inversely proportional to each other.

A longitudinal wave is a type of wave where the particles of the medium move parallel to the direction of the wave motion. Examples of longitudinal waves include sound waves and seismic waves.

So, the number of wavelengths that pass a point each second is known as the frequency of a wave and is measured in units of Hertz (Hz).

Therefore, the correct answer is D. frequency.

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Answer:

I would say the answer is A... but I'm not so sure ....

A spherical drop of water carrying a charge of 41pC has a potential of 570 V at its surface (with V=0 at infinity) (a) The radius of the drop is approximately 5.88 micrometers (μm).

(b) The potential at the surface of the new drop formed by combining two drops of the same charge and radius is approximately 1140 V.

(a) To find the radius of the drop, we can use the formula for the potential of a charged sphere, which is given by V = (k * Q) / r, where V is the potential, k is the electrostatic constant, Q is the charge, and r is the radius of the sphere. Rearranging the formula to solve for the radius, we have r = (k * Q) / V. Plugging in the given values of Q = 41 pC (pico coulombs) and V = 570 V, and using the value of k = 8.99 × 10^9 Nm^2/C^2, we can calculate the radius to be approximately 5.88 μm.

(b) When two drops combine to form a single spherical drop, the total charge remains the same. Therefore, the potential at the surface of the new drop can be calculated using the same formula as before, but with the combined charge. Since each drop has the same charge and radius, the combined charge will be 2 times the original charge. Plugging in Q = 82 pC (2 * 41 pC) and using the given value of V = 570 V, we can calculate the potential at the surface of the new drop to be approximately 1140 V.

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The correct answer is(b). There is a physical change from the solid state to a gas state where energy between the molecules increases.

During sublimation, carbon dioxide transitions directly from the solid state (dry ice) to the gas state without passing through the liquid phase. In this process, individual molecules of carbon dioxide gain energy from the surroundings, leading to an increase in their kinetic energy and molecular movement.

As a result, the carbon dioxide molecules separate from each other and form a gas. This phase change is considered a physical change rather than a chemical change since the chemical composition of carbon dioxide remains the same throughout the process.

Therefore, the sublimation of carbon dioxide results in a physical change where the molecules transition from the solid state to the gas state, gaining energy and increasing their molecular movement.

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search it up on yt lol

Explanation:

To calculate the tensile strength (T), we need to use the formula:

T = Force/Area

In this case, we are given the peak compressive force as 2084 N. However, we need to convert this to tensile force since we want to calculate the tensile strength. Tensile force is equal in magnitude but opposite in direction to compressive force.

Therefore, T = 2084 N

Next, we need to calculate the cross-sectional area (A) of the material. Given that the diameter of the material is 1 inch, we can calculate the radius (R) as half of the diameter:

R = 1 inch / 2 = 0.5 inch

We need to convert the radius to meters since the SI unit of force is Newton (N) and the SI unit of area is square meters (m^2). Since 1 inch is equal to 0.0254 meters, we can convert the radius as follows:

R = 0.5 inch * 0.0254 meters/inch = 0.0127 meters

Now, we can calculate the cross-sectional area (A) of the material using the formula for the area of a circle:

A = π * R^2

A = 3.1416 * (0.0127 meters)^2

A ≈ 0.0005087 square meters

Finally, we can calculate the tensile strength (T) using the formula:

T = 2084 N / 0.0005087 square meters

T ≈ 4,093,981.8 N/m^2

Therefore, the tensile strength (T) is approximately 4,093,981.8 N/m^2.

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Answer:

Time taken by birdie’s trip = 1.2235 s (Approx)

Explanation:

Given:

Velocity = 4.25 m/s

Displacement = 5.2 m

Find:

Time taken by birdie’s trip = ?

Computation:

⇒ Time taken = Displacement / Velocity

⇒ Time taken by birdie’s trip = Displacement / Velocity

⇒ Time taken by birdie’s trip = 5.2 m / 4.25 m/s

⇒ Time taken by birdie’s trip = 1.2235 s (Approx)

Answer:

To find the average distance of the numbers you provided (255cm, 242cm, 245cm), you can add all the numbers together and divide by the number of numbers in the set.

In this case, you would add 255cm + 242cm + 245cm = 742cm, and then divide by 3 (the number of numbers in the set) to get an average distance of 244cm.

You can also use this formula: (255 +242 + 245) /3 = 244

A river 100 m wide flows due south at 1 m/s, a boat that goes 1 m/s relative to the water .The resultant distance will be 141m.

Option A is correct.

The sum of an object's individual vector velocities is its final velocity. The scalar product of an object's mass and its acceleration vector is equal to the sum of its vector forces.

Considering that the boat travels in a river that flows 1 m/s due south at a speed of 1 m/s due east.

The positive x and y axes should be represented by the north and east, respectively.

After that, we can convert the boat's resulting velocity into a vector.

Vr = i - j ( 1 m/s on x axis and -1m/s on y axis)

The time required to travel 100m from west to east at a speed of 1m/s is;

Time t = distance/speed = 100m/1m/s = 100s

Distance = velocity × time = (i - j) × 100 = 100i - 100j

Distance = 100i - 100j (in vector form)

Magnitude of the Resultant distance can be given as:

dr = √(dx ²+ dy²)

dr = √(100² + 100²)

dr = √(20000)

dr = 141.42m

dr = 141m

The relative velocity refers to how one observer would perceive another moving object within their own frame. The velocity of an object when there are multiple influences on its motion in a fixed reference frame is known as the resultant velocity.

At the point when an item, say, a boat, goes at a specific speed, and the medium through which it voyages, say, a stream, has its own speed, we can track down the resultant speed of the item by adding the two speeds. We find the boat's resulting velocity vector in this example.

Incomplete question:

A river 100 m wide flows 1 m/s due south. A boat that travels 1 m/s relative to the water is pointed due east as it crosses from the west bank. Relative to its starting point, the boat travels

A) 141 m.

B) 100 m.

C) 200 m.

D) more than 200 m.

E) nowhere

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SW2 (config-if-range)channel-group 1 mode desirable. Ether-channel is made by combining multiple physical links that are seen as one link between two switches.

The possible combination to establish an ether-channel between SW1 and SW2 using LACP or PAgP .Ether-channel is a port link aggregation technology or port channel architecture used primarily on Cisco.

Ether-channel is used for providing fault tolerance and high-speed links between switches, routers and servers. To form an Ether-channel there are 2 protocol and link aggregation control protocol. Also load balances traffic across links in the bundle. Traffic is not necessarily distributed equally among all the links. Ether-channel will double or quadruple your bandwidth.

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Answer:

B. A system cannot take in additional matter.

Explanation: The total amount of energy in the universe remains constant, it can merely change from one form to another.

Hope it helps you:)))

have a good day

The correct answer is A. an increase in Earth's average surface temperature.

While all of these are aspects of global warming, option A best summarizes it.

The height at which the two stones meet is 10 m.

The height from the surface of the earth where the two stones meet is calculated as follows;

Time of motion of the first stone;

t = √ (2h/g)

where;

t = √ (2h/g)

t = √ (2 x 10/9.8)

t = 1.43 s

Time of motion of the second stone;

v = u - gt

0 = 20 - 9.8t

t = 20/9.8

t = 2.04 s

The two stones meet when it has travelled for 1.43 s.

The height at which the two stones meet is calculated as;

h = ¹/₂ x 9.8 x 1.43²

h = 10 m

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The angle of incidence in the glass is approximately 31.8°.

To find the angle of incidence in the glass, we can use Snell's law, which states that the ratio of the sines of the angles of incidence and refraction is equal to the ratio of the indices of refraction:

n1 * sin(angle of incidence) = n2 * sin(angle of refraction)

In this case, n1 is the index of refraction for flint glass (1.61), n2 is the index of refraction for ethanol (1.36), and the angle of refraction in ethanol is 27.2°.

Plugging in these values into Snell's law, we get:

1.61 * sin(angle of incidence) = 1.36 * sin(27.2°)

To find the angle of incidence, we can rearrange the equation:

sin(angle of incidence) = (1.36 * sin(27.2°)) / 1.61

Now, we can solve for the angle of incidence by taking the inverse sine (or arcsine) of both sides:

angle of incidence = arcsin((1.36 * sin(27.2°)) / 1.61)

Calculating this value, the angle of incidence in the glass is approximately 31.8°.

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The number of photons in the pulse is 1.21 × 1022.

The energy of a photon can be calculated using the equation:

E = hf, where

E is the energy of a photon,

h is the Planck's constant, and

f is the frequency of the light.

Then, using the equation c = λf, where

c is the speed of light,

λ is the wavelength of the light and

f is the frequency of the light, the frequency of the light can be determined.

Planck's constant (h) is a fundamental constant in quantum mechanics that relates the energy of a photon to its frequency.

Its value is 6.626 × 10-34 joule seconds (J·s).

The frequency of the light is:

f = c / λ

= 3.00 × 108 / 480 × 10-9

= 6.25 × 1014 Hz

The energy of the photon can be calculated:

E = hf

= 6.626 × 10-34 × 6.25 × 1014

= 4.14 × 10-19 J

The number of photons can be determined by dividing the energy of the pulse by the energy of a photon:

n = E / E_photon

= 5.0 × 103 / 4.14 × 10-19

= 1.21 × 1022 photons

Therefore, the number of photons in the pulse is 1.21 × 1022.

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Answer:

4

Explanation:

1/.25 =4

Answer:

1040

Explanation:

The rules for significant digits is that non-zero digits are significant figures. The  zero in between 1 and 4 is significant because any zeroes between two significant digits are significant. Trailing zeroes if there is no decimal point are insignificant.

The number 1045.2 rounded to three significant digits would be 1040 because the rightmost zero is not a significant digit.

In positional notation, significant figures refer to the digits in a number that is trustworthy and required to denote the amount of something, also known as the significant digits, precision, or resolution.

The definition of a significant digit according to the criteria is a non-zero digit. Any zeroes between two significant digits, such as the one between 1 and 4, are noteworthy. In the absence of a decimal point, trailing zeroes are not relevant.

According to the criteria for significant digits, non-zero digits are important numbers. The zero between 1 and 4 is crucial, as is any zero between two significant digits. The trailing zeroes are irrelevant if there is no decimal point.

Thus, the number 1045.2 rounded to three significant digits would be 1040.

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