Including time variation, the phase expression for a wave propagating in the z-direction is ωt - βz. For a constant phase point on the wave, this expression is constant; take the time derivative to derive velocity expression in (2-53)

Answer:

\(1.55\ \text{m/s}\)

\(2.68\ \text{m/s}\)

Explanation:

v = Velocity of the elevator = 3.1 m/s

\(\theta\) = Angle of the slope = \(30^{\circ}\)

Vertical component is given by

\(v_y=v\sin\theta\\\Rightarrow v_y=3.1\sin30^{\circ}\\\Rightarrow v_y=1.55\ \text{m/s}\)

The vertical component of the velocity is \(1.55\ \text{m/s}\).

Horizontal component is given by

\(v_x=v\cos\theta\\\Rightarrow v_x=3.1\times \cos30^{\circ}\\\Rightarrow v_x=2.68\ \text{m/s}\)

The horizontal component of the velocity is \(2.68\ \text{m/s}\).

Answer:

Sound waves bend around the corners of various obstacles.

Explanation:

I took the test

Answer:

v devided by m  and answer is 0.1

Explanation:

v

m

Concave lens is also called negative lens or a diverging lens. There are many uses of the concave lens, like in telescopes, cameras, lasers, glasses, binoculars and others.

Concave lenses has at least one surface curved inside. Concave lens is also known as a diverging lens because it is shaped round inwards at center and bulges outwards through edges, making light diverge. They are used to treat myopia as they make faraway objects look smaller than they actually are.

Concave lens is thinner in the middle and thicker at the edges whereas convex lens is thicker in the middle and thinner at edges.

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Answer:

heat and power

Explanation:

is the simultaneous production of electricity and heat both of which are used

In conclusion, to find Vr at t = 1.98 ms, we need to use the equation Vl = jωL * I to find I and then use Ohm's Law equation Vr = I * R to find Vr.

The voltage across an inductor in an AC circuit is given by the formula Vl = jωL * I, where Vl is the voltage across the inductor, j is the imaginary unit, ω is the angular frequency of the AC source, L is the inductance of the inductor, and I is the current flowing through the inductor.

In this case, we are given that the inductance of the inductor is 0.160 H and the voltage across the inductor is Vl. We need to find the voltage across the resistor, Vr, at a specific time, t = 1.98 ms.

To find Vr, we can use Ohm's Law, which states that Vr = I * R, where Vr is the voltage across the resistor, I is the current flowing through the resistor, and R is the resistance of the resistor.

Since the inductor and resistor are connected in series, the current flowing through them is the same. Therefore, we can use the equation Vl = jωL * I to find I, and then use Ohm's Law to find Vr.

By substituting the given values into the equation Vl = jωL * I and solving for I, we can find the current flowing through the circuit.

Finally, by substituting the found value of I into Ohm's Law equation Vr = I * R and solving for Vr, we can find the voltage across the resistor at t = 1.98 ms.

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Answer:

\( \longrightarrow \boxed{ \boxed{ \tt{6000 \: s}}}\)

Hope this helps! <3

-------- HappY LearninG ! --------

Answer:

h = 30.61 m

Explanation:

In this problem they indicate the pressure at the bottom of the lake and the density of the water, for which they must ask what is the depth of the lake.

The pressure is given by the expression

           P = \(P_{atm}\) + rho g h

           P - P_{atm} = rho g h

The gauge pressure value is P- P_{atm} = 3 105 N / m²

          h = \(\frac{P - P_{atm}}{ \rho \ g}\)

let's calculate

          h = \(\frac{3 \ 10^5}{1000 \ 9.8}\)

          h = 30.61 m

Explanation:

Mass = volume × density

⇒ mass of iron = (5 cm³ ) (7.8 g/cm³)

                         = 39.0 g

Answer:

200 m / min

Explanation:

Total distance = 2000 m

Total time = 2+4+1+3 = 10 minutes

Average speed = 2000 m / 10 min = 200 m/min

Answer:

\( \boxed{\sf Potential \ energy \ (PE) = 7.35 \ kJ} \)

Given:

Mass (m) = 75 kg

Height (h) = 10 m

Acceleration due to gravity (g) = 9.8 m/s²

To Find:

Potential Energy (PE)

Explanation:

The formula for potential energy due to gravity:

\( \boxed{ \bold{PE = mgh}}\)

Substituting value of m, g & h in the formula:

\( \sf \implies PE = 75 \times 10 \times 9.8 \\ \\ \sf \implies PE = 7350 \: J \\ \\ \sf \implies PE = 7.35 \: kJ\)

The second projectile is 1.4 times faster than first projectile.

Initial velocity of projectile is proportional to the square root of height covered by pendulum.

From the question, we have

U_2/U_1  =√(h_2/h_1 )

U_2 =√(h_2/h_1 )×U_1

U_2 =√(5.2/2.6)×U_1

U_2= 1.41U_1

The second projectile is 1.4 times faster than first projectile.

Projectile:

The object that is propelled by the application of an external force and then moves freely while being affected by gravity and air resistance is referred to as a projectile. Despite the fact that all items traveling through space are projectiles, they are frequently used in sports and warfare.

Complete question:

In a ballistic pendulum experiment, projectile 1 results in a maximum height h of the pendulum equal to 2.6 cm. A second projectile (of the same mass) causes the the pendulum to swing twice as high, h2 = 5.2 cm. The second projectile was how many times faster than the first?

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The correct answer is: "Because the attenuation caused by the longer distance will cause signal loss not only for the camera video but also for the DC power."

When using Power over Ethernet (PoE) for devices like cameras, it's crucial to consider the distance and the potential signal loss that may occur. Attenuation refers to the decrease in signal strength as it travels through the cable. Over longer cable runs, attenuation becomes a significant factor that can affect both the video signal and the power delivered to the PoE device.

Cat 6a cable is preferred over Cat 6 in this scenario because it has better performance characteristics and reduced attenuation over longer distances. Cat 6a cable is designed to support 10 Gigabit Ethernet (10GBASE-T) at distances up to 100 meters. It provides improved transmission performance, including reduced crosstalk and higher bandwidth.

On the other hand, Cat 6 cable is typically designed for 1 Gigabit Ethernet (1000BASE-T) at shorter distances. While it may work for some PoE applications, the attenuation caused by the longer cable run can lead to signal loss, affecting both the camera video and the DC power transmitted through the cable.

Cat 5e cable is also a suitable option for PoE applications, as it can support both data and power transmission over shorter distances. However, for longer cable runs, Cat 6a is preferred due to its superior performance and reduced signal loss.

In summary, when dealing with an 85-meter cable run to a PoE camera, Cat 6a is the preferred choice over Cat 6 due to its better attenuation characteristics, ensuring reliable transmission of both video and power signals.

Hence, the correct answer is: "Because the attenuation caused by the longer distance will cause signal loss not only for the camera video but also for the DC power."

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$0.075 is the cost to operate the light for an hour.

As per the given information,

The cost of electrical energy = $0.075 per kilowatt-hour

Kilowatt-hours, or kWh, are the measure of electrical energy. They are calculated by multiplying the amount of power used (measured in kW) by the number of hours during which it is used. The total cost of energy is calculated by multiplying that figure by the price per kWh.

If we assume that the light uses 1 kilowatt-hour of electrical energy every hour of use, we can compute the cost of running the light for an hour as follows:

Cost = Energy used x Cost per kilowatt-hour

Cost = 1 kilowatt-hour x $0.075 per kilowatt-hour

Cost = $0.075

Therefore, it would cost $0.075 to operate the light for one hour. If the light consumes more or less than 1 kilowatt-hour per hour, then the cost would be proportionally higher or lower.

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Ek = 1/2 mv^2

9 × 10^4 = 1/2 × 800 × v^2

9 × 10^4/400 = 400 v^2 / 400

9 × 10^4/400 = v^2

√225 = v

15 ms⁻¹ = v

That's the only way I know how to work it out

I think in this case velocity and speed would be considered the same because me

s = d/t and v=d/t

one is distance travelled and the other is displacement of a body

The main differences between hot air from a hair dryer and hot steam from a pot of boiling water are their moisture content, temperature, and the way they feel on the skin.

Both hot air from a hair dryer and hot steam from a pot of boiling water are forms of heated gases, but they have some fundamental differences. The main difference is that hair dryers blow out hot, dry air, while boiling water produces hot, moist steam. Hair dryers heat up the air around the heating element and then blow it out, so the air is relatively dry. In contrast, when water is heated in a pot, the water molecules gain energy and become steam, which is a gas that contains water vapor. Another difference is their temperature.

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Answer:

soln

work done= 200J

Time taken = 5 sec

power=?

We know that,

power=w/t

= 2000/5

= 400W

Explanation:

hopw this will help you

Answer:

The centripetal acceleration of car is 8 m/s².

Explanation:

Answer:

Not really, because wearing a mask can lower your immune system and covid can be caught like any other virus body contact and body fluids. So since you can still get it through those ways then you're going to get it and be worse off than if you don't wear a mask.

you can test this by not wearing a mask and see how not bad it is catching covid over getting it while you wear a mask.

Explanation:

Answer:

Yes

Explanation:

Hypothesis- if masks are used to protect yourself from Covid-19 then the spread of the virus will decrease

You could test this by:

Getting a mask and using materials such as shampoo, soap, honey, glue,  or (safe) chemicals to see how much the masks absorbs the materials. By doing so you can show how the mask can help block certain materials from entering or leaving the mask area therefore slowing the spread of Covid.

The Sherman Antitrust Act οf 1890 and the Claytοn Antitrust Act οf 1914 are twο landmark legislatiοns in the United States aimed at prοmοting fair cοmpetitiοn and preventing mοnοpοlistic practices.

Whereas the Sherman Act οnly declared mοnοpοly illegal, the Claytοn Act defined as illegal certain business practices that are cοnducive tο the fοrmatiοn οf mοnοpοlies οr that result frοm them.

The Sherman and Claytοn Acts have had prοfοund impacts οn sales in the United States. By prοmοting cοmpetitiοn, curbing mοnοpοlies, prοtecting cοnsumer welfare, fοstering innοvatiοn, and facilitating small business grοwth, these acts have created a mοre vibrant and dynamic marketplace.

The impacts οf these acts have been instrumental in shaping the sales landscape, ensuring fair and cοmpetitive practices, and ultimately benefiting cοnsumers thrοugh increased chοices, imprοved quality, and affοrdable prices. The οngοing enfοrcement and adherence tο these acts remain essential fοr maintaining a healthy and cοmpetitive sales envirοnment in the United States.

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Answer:

he will be in profit

Explanation:

Himalayan region are high above the sea level so the gravity will be less there compared to the Terai region

Terai lies way below he Himalayan region so the pull of gravity will be more compared to Himalayan region

that's why he will be in profit but not loss

Answer:

just rry

Explanation:

Answer:

A solar eclipse results when the moon passes in between the earth and the sun hiding the sun fully or partly for some time. A lunar eclipse occurs when the earth passes in between the moon and the sun casting its shadow on the moon and thus hiding it fully or partly for some time.

Explanation:

your welcome

Measuring 27ml of liquid using graduated cylinder, it is used to measures the volumes of liquids.

Long, thin vessels called graduated cylinders are used to measure liquid volume. They are not meant to be heated, stirred, or weighed. Graduated cylinders typically come in sizes between 5 and 500 ml. Some of them can even hold volumes greater than one liter.

With your eyes directly level with the liquid, place the graduated cylinder on a flat surface and measure the height of the liquid inside. The liquid will usually slant downward. The term "meniscus" refers to this curve. Read the measurement at the meniscus's bottom at all times.

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The sympathetic and parasympathetic nerve pathways are two divisions of the autonomic nervous system. These pathways are responsible for regulating involuntary functions such as heart rate, digestion, and respiratory rate.

In order for these pathways to function, a stimulus is needed to trigger a response. This stimulus can be internal or external. Once the stimulus is detected, a nerve impulse is sent through a sensory neuron to the central nervous system where it is processed by an interneuron.

The processed signal is then sent through a preganglionic motor neuron to either a chain ganglia or cranial nerve ganglia, depending on the location of the effector organ. From here, the signal is transmitted to a postganglionic motor neuron which sends the signal to the effector organ. The effector organ then responds to the signal, either increasing or decreasing its activity depending on the pathway that is activated.

Here is a diagram that shows the direction of the nerve impulse along the pathway:
[Insert diagram here]
To help you understand the pathway of the nerve impulse, here are some pictures and titles that describe each step of the process:

1. Stimulus Detection: This image shows an example of an external stimulus being detected by a sensory neuron.

2. Interneuron Processing: This image shows an interneuron in the central nervous system processing the signal received from the sensory neuron.

3. Preganglionic Motor Neuron: This image shows a preganglionic motor neuron sending the signal to the chain or cranial nerve ganglia.

4. Postganglionic Motor Neuron: This image shows a postganglionic motor neuron transmitting the signal to the effector organ.

5. Effector Organ Response: This image shows the effector organ responding to the signal received from the postganglionic motor neuron.

Now, for the reactions to the motor impulse. The sympathetic and parasympathetic pathways have different effects on the effector organs. Here are three possible reactions for each pathway:

Sympathetic Pathway:
1. Increase in heart rate
2. Dilated pupils
3. Decrease in saliva production

Parasympathetic Pathway:
1. Decrease in heart rate
2. Constricted pupils
3. Increase in saliva production.

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These are the part of a constellation. Constellation is a group of stars that forms a pattern on the celestial sphere. The pattern typically represents, an inanimate object, a god, an animal, a mythological person etc.

These are related to a constellation named Ursa Major.

The big dipper is an asterism that makes up the part of Ursa Major or the great bear.

The little dipper is a part of Ursa minor or the little bear. It is usually seen at the upper right of big dipper.

This is also known as polaris.

As the time passes, with this changes the direction of sun and moon.

With all the facts stated, the stars will move from one direction to another.

So, the big dipper will also move.

It is usually seen in the North direction and are useful for the navigation.

Hence, we can say that after six hours, the big dipper will be seen to the right of Polaris; that is, 90 degrees counterclockwise from its current position.

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A horizontal line is used to indicate that the bus is not accelerating because the slope of a horizontal line is zero. When the slope is zero, it means there is no change in velocity over time, indicating a constant velocity or no acceleration.

This is useful when analyzing the motion of the bus, as it allows us to identify periods of constant velocity. By drawing a horizontal line on a velocity-time graph, we can clearly see when the bus is not accelerating. To understand this, it's important to know that the slope of a line on a velocity-time graph represents acceleration. A positive slope indicates positive acceleration, while a negative slope indicates negative acceleration. A horizontal line has a slope of zero, which means there is no change in velocity over time, indicating no acceleration.

By using a horizontal line to indicate where the bus is not accelerating, we can easily identify when the bus is maintaining a constant speed. This can be useful in analyzing the motion of the bus, as it allows us to differentiate between periods of acceleration and periods of no acceleration. For example, if the bus starts at rest and then begins to accelerate, we will see a positive slope on the graph. Once the bus reaches its desired speed and maintains it, the slope will become horizontal, indicating no further acceleration. This horizontal line can continue until the bus starts decelerating, at which point the slope will become negative. In summary, using a horizontal line on a velocity-time graph helps us visualize when the bus is not accelerating by indicating periods of constant velocity.

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Answer:

the momentum of the diver is 778.4 m/s.

Explanation:

Given;

mass of the diver, m = 56 kg

speed at which the diver strikes the water, v = 13.9 m/s

duration of the motion, t = 0.65 s

The momentum of the diver is calculated as follows;

P = mv

P = 56 x 13.9

P = 778.4 m/s

Therefore, the momentum of the diver is 778.4 m/s.

Answer:

When a solid reaches the temperature of its melting point, it can become a liquid. For water, the temperature needs to be a little over zero degrees Celsius (0oC) for you to melt.

Explanation:

Answer:

-50N/m

Explanation:

Force , F = 15N

Displacement , x = 0.3m

Spring constant , K = ?

K = -F/x

K = -15N/0.3m

K = -50N/m

Answer: 50 N/m

Explanation:

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