Help!! Please!!

15 points
15 points

Answer:

4 amp

Explanation:

From ohm's law,

V=IR

so,

I=V/R

I=120/30

I=4amp ans..

11.The time at 75° East longitude would be 1 hour and 20 minutes behind. 12.The time at 135° degrees East longitude would be 4 hours ahead. and 13. the time in Lima, Peru (15° South latitude, 75° West longitude) would also be 9:30 AM.

At 2:00 AM at 90° East longitude, the time at 75° East longitude would be 1 hour and 20 minutes behind. This is because for every 15 degrees of longitude, there is a time difference of approximately 1 hour. Since the two longitudes in question have a difference of 15 degrees, we can divide this by 15 to calculate the time difference.

If it is 8:00 PM at 15° East longitude, the time at 135° East longitude would be 4 hours ahead. Similarly, for every 15 degrees of longitude, there is an approximate time difference of 1 hour. Since the two longitudes in question have a difference of 120 degrees, we can divide this by 15 to calculate the time difference.

There is a 7-hour difference** between 105° West longitude and the Prime Meridian (0° longitude). The Prime Meridian, passing through Greenwich, England, serves as the reference point for determining time zones. As one moves westward from the Prime Meridian, each 15 degrees of longitude corresponds to a time difference of approximately 1 hour. Therefore, the time at 105° West longitude would be 7 hours behind the time at the Prime Meridian.

If it is 9:30 AM in New York (41° North latitude, 75° West longitude), the time in Lima, Peru (15° South latitude, 75° West longitude) would also be 9:30 AM. The latitude does not affect the time difference between the two locations. However, since both locations have the same longitude (75° West), they would experience the same local time. The time difference between different latitudes is primarily significant for determining time zones rather than the actual time within a specific time zone.

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Answer:

D. both physical and mental health

Explanation:

because if you cant mentally function then you wont have the desire to be physical and if your not physical then your not mentally well and you get all depressed.

The work done by the electric field in moving a -7.7 uC charge from the ground to a point +65 V higher is -500.5 μJ.

To calculate the work done by the electric field, we use the formula W = qΔV, where W is the work done, q is the charge, and ΔV is the change in potential.

Given that the charge (q) is -7.7 uC (micro coulombs) and the change in potential (ΔV) is +65 V (volts) higher, we can substitute these values into the formula: W = (-7.7 μC) × (65 V).

Calculating the product of the charge and the change in potential gives us -500.5 μJ (microjoules). The negative sign indicates that work is done against the direction of the electric field.

Therefore, the work done by the electric field in moving the -7.7 uC charge from the ground to a point +65 V higher is -500.5 μJ. This represents the energy transferred by the electric field as the charge moves through the potential difference.

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ANSWER:

1. C. Wave X and Wave Y share the same speed.

2. D. The speed of a wave is affected by the properties of the medium it is traveling through, not amplitude.

STEP-BY-STEP EXPLANATION:

The amplitude of a wave does not affect the speed at which the wave travels. Both wave A and wave B travel at the same speed. The speed of a wave is only altered by alterations in the properties of the medium through which it travels.

Therefore, in the first art the correct answer is C. Wave X and Wave Y share the same speed.

If the medium is uniform (does not change), the speed of the wave will be constant.

Therefore, the correct answer is: D. The speed of a wave is affected by the properties of the medium it is traveling through, not amplitude.

A G star with a brightness of 100 L Sun is classified as Figure 19.15 lum inosity Classes. Its surface area must be 100 times greater since it emits 100 times more energy while maintaining the same temperature.

Even more bright than the massive stars are the stars of group C. These are the largest stars, or supergiants, with the highest luminosities. If a red supergiant like Betelgeuse took the place of the Sun in our solar system, it would be larger than Jupiter's orbit.

A main-sequence (core hydrogen-burning) star with the spectral type O and luminosity class V is referred to as an O-type main-sequence star (O V). The mass of these stars ranges from 15 to 90 times that of the Sun, and their surface temperatures range from 30,000 to 50,000 K. They have a brightness that ranges from 40,000 to 1,000,000 times that of the Sun.

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Answer:

The answer is not B or D because they need light co2 and water to make their food so B and D are out. and unless someone is walking during winter to feed it. It will not be A so the answer is C.

Explanation:

Plants can use heat in the ground to make food in winters. Plants make food through photosynthesis, and photosynthesis takes place mostly in plant leaves, but when plants lose their leaves in the winter, they do not die. Thus, the correct option is B.

Photosynthesis is the process through which plants use the sunlight, which is trapped in the chlorophyll pigment present in the chloroplast of cells to convert water, and carbon dioxide to produce oxygen gas and energy in the form of sugar (carbohydrate).

Photosynthesis is the process in which energy transformation takes place. In this process, light energy from the sun is converted into chemical energy that is in the form of carbohydrate in the leaves of the plant.

Therefore, the correct option is B.

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Acid rain is the result of pollutants being released into the air

Acid rain is defined as rain or any other type of precipitation that is unusually acidic, which means it contains a lot of hydrogen ions. Acid rain has a pH level that is lower than this and typically ranges from 4-5. Most water, including drinking water, has a neutral pH that exists between 6.5 and 8.5.

When gases like sulphur dioxide and nitrogen oxides are released into the atmosphere, a chemical reaction takes place that eventually results in acid rain. These substances have the capacity to ascend to extremely high altitudes in the atmosphere, where they combine and interact with oxygen, water, and other chemicals to create acid rain, a type of ozone-depleting haze.

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El trabajo de la fuerza aplicada es 1905 J

Los datos del problema son  

El trabajo se define por el producto escalar entre la fuerza y ​​el desplazamiento, las letras en negrita indican vectores

        W = F. D

Donde W es el trabajo, F la fuerza, d el desplazamiento y el punto representa el producto escalar,  

           W = F d cos θ

Esta expresión es un escalar y θ es el ángulo entre la fuerza y la distancia

Calculamos el trabajo

     W = 110 20 cos 30  

      W = 1905 J

Donde J es la unidad de trabajo

El trabajo de la fuerza que es un escalar es 1905 J

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Answer:

245.1° and 13 knots

Explanation:

The given parameters are;

The true heading = 135°

The resultant ground track = 130°

The true airspeed = 135 knots

The ground speed = 140 knots

Given that the true airspeed the ground speed and the wind direction and magnitude form a triangle, we have;

From cosine rule, we have;

a² = b² + c² - 2×b×c×cos(A)

Where

a = The magnitude of the wind speed in knot

b = The true airspeed = 135 knots

c = The ground speed = 140 knots

A = The angle in between the true heading and the resultant ground track heading = 5°

Which gives;

a² = 135² + 140² - 2×135×140×cos(5 degrees) = 168.84 knots²

a = √168.84 = 12.9934 ≈ 13 knots

We have;

135 × sin(135 degrees) - 140× sin(130 degrees) = -11.7868

135 × cos(135 degrees) - 140× cos(130 degrees) = -5.469

Tan(θ) = -11.8/-5.5 = 2.155

θ = tan⁻¹(2.155) = 65.108°

Given that the wind is moving in opposite direction (slowing down the airplane, we add 180°, to get

Therefore, the angle direction = 180 + 65.108 = 245.1

Therefore, we have;

245.1° and 13 knots

v(speed) = wavelenght x frequency

v = 0.579 m x 4 hz = 2.32 m/s

Answer:

a and c

Explanation:

Answer:

has more energy, has a greater amplitude, has a higher frequency

Explanation:

Answer:

Calcium chloride is very effective, working at temperatures below most products, and is significantly more effective than sodium chloride because of its ability to extract moisture from its surroundings and to cause exothermic or heat generating reactions.

Explanation:

Hope this helps

C. 2400 W. The average power supplied by the student running up the flight of stairs is 2400 watts. To calculate the average power supplied by the student, we can use the formula:

Power = Work / Time,

where Power is measured in watts (W), Work is measured in joules (J), and Time is measured in seconds (s).

The work done by the student is given by:

Work = Force × Distance,

where Force is the force applied by the student and Distance is the vertical distance traveled.

Given:

Force = 600 N,

Distance = 4.0 m,

Time = 4.2 s.

First, let's calculate the work done:

Work = 600 N × 4.0 m = 2400 J.

Next, we can calculate the average power:

Power = Work / Time = 2400 J / 4.2 s.

Calculating this expression, we find the average power supplied by the student.

Now, let's evaluate the answer options:

A. 630 W

B. 571 W

C. 2400 W

D. 35.7 W

By comparing the calculated value of the average power with the given answer options, we find that the correct answer is:

C. 2400 W.

Therefore, the average power supplied by the student running up the flight of stairs is 2400 watts.

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21joule  heat is generated in 3.50 s .

The rate of heat transfer over time is measured by the heat current. The SI unit for heat current, or joule per second, or watt, refers to it as a rate of heat energy through time (W). Through conduction, heat moves through material things, with heated particles transferring their energy to nearby particles.

Where I is current, R is resistance, and t is time, the equation Q=I2Rt describes the amount of heat produced in a circuit.

H = I^2Rt

H = 2.00^2 × 1.50 × 3.50

H = 21joule .

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Yes, it is possible for a roller skate and a truck to have the same momentum if the roller skate is moving at a high velocity and the truck is moving at a much lower velocity.

Momentum is calculated by multiplying an object's mass by its velocity, so if the roller skate has a very small mass but is moving very quickly, its momentum could be equal to a truck with a much larger mass but a slower velocity. However, it is important to note that this scenario is unlikely in real-life situations and would require specific conditions to occur. A roller skate and a truck can have the same momentum in a situation where the product of the mass and velocity for each is equal. Momentum (p) is calculated using the formula p = mv, where m is mass and v is velocity.

For example, if a roller skate with a mass of 1 kg moves at a velocity of 10,000 m/s, its momentum would be 10,000 kg·m/s. If a truck with a mass of 5,000 kg moves at a velocity of 2 m/s, its momentum would also be 10,000 kg·m/s. In this scenario, both the roller skate and the truck have the same momentum.

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The drift velocity of the electrons in the wire is directly proportional to the applied electric field.
The drift velocity will increase by a factor of 4.67 when the wire is connected to a DC electric source of 7.0 V.

To determine the factor by which the drift velocity changes, we need to consider the relationship between drift velocity (v), current (I), and voltage (V). This relationship is given by Ohm's law:

V = IR

Where R is the resistance of the wire, which remains constant in this situation. The drift velocity is proportional to the current, so we can express the change in drift velocity as a ratio of currents:

(I2/I1) = (V2/R)/(V1/R)

Since R is constant, it cancels out:

I2/I1 = V2/V1

Now, you can plug in the given voltage values:

I2/I1 = 7.0 V / 1.5 V = 4.67

So, the drift velocity changes by a factor of 4.67 when the wire is connected to a 7.0 V DC electric source compared to a 1.5 V battery.

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Light is a form of electromagnetic radiation that is visible to the human eye. It is a fundamental part of our everyday experience, allowing us to perceive the world around us. Light is composed of tiny particles called photons, which are packets of energy that travel in waves.

The nature of light is dual in character, exhibiting properties of both particles and waves. This duality is described by the wave-particle duality principle in quantum physics. According to this principle, light can behave as both a wave and a particle, depending on how it is observed or measured.

As a wave, light exhibits characteristics such as wavelength, frequency, and amplitude. It travels in the form of electromagnetic waves through a vacuum or a medium, such as air or water. The wavelength of light determines its color, with shorter wavelengths corresponding to colors like violet and blue, and longer wavelengths corresponding to colors like red and orange.

As a particle, light is composed of discrete packets of energy called photons. Photons have zero rest mass and travel at the speed of light in a vacuum (approximately 299,792 kilometers per second). The energy of a photon is directly proportional to its frequency, meaning that higher frequency light carries more energy.

The behavior of light can be explained using different theories and models, such as wave optics (describing light as a wave) and quantum mechanics (describing light as a stream of particles). Both approaches are necessary to understand the various phenomena associated with light, including reflection, refraction, diffraction, interference, and polarization.

Light interacts with matter in various ways, including absorption, transmission, and reflection. These interactions give rise to the colors we see, the formation of images, and the functioning of optical devices such as lenses, mirrors, and lasers.

In summary, light is a form of electromagnetic radiation that behaves both as a wave and a particle. Its nature as both a wave and a particle allows it to exhibit a wide range of properties and phenomena, making it a fascinating and essential component of our understanding of the natural world.

Explanation:

Light is a form of electromagnetic radiation that travels in waves and consists of tiny particles called photons. These photons carry energy and behave both as particles and waves, depending on the context. Light has properties such as wavelength (the distance between wave peaks), frequency (the number of wave cycles per second), and amplitude (the intensity or brightness of the light). It interacts with matter by reflecting off surfaces, bending when passing through different materials, being absorbed by objects, or transmitting through transparent substances. Light is crucial for vision, communication, and the study of the universe.

Distance is indeed a scalar amount that also refers to "how the ground an object has encased", and the Displacement is a vector thing that leads "to the extent to which an object is located", and the further calculation can be defined as follows:

Given:

distance= 70 miles

displacement = 20 miles

Please find the graph in the attached file.

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The statement, "The Voyager 1 space probe can't change its own motion" is correct and true. The Voyager 1 space probe was launched by NASA in 1977, and since then it has traveled over 14 billion miles away from Earth. It's the most distant spacecraft from Earth.

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\(\bold{Heya!}\)

(b) comb induces a net dipole moment opposite to the direction of field.

When a comb rubbed with dry hair it's attracts pieces of piece of paper. This is because the comb that induces of the dipole net that of the moment thatopposite of the field. And, This happens the field dueing to charge of the comb induces of the dipole moment in the paper of the molecules in the dielectric.

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\(\underline{Answer :}\)

Jaceysan ~

Answer:

Option B

Explanation:

When a comb is rubbed with dry hair it induces some charge or its get charged either positive or negative

As paper remains in neutral hence it attracts the paper

Hence option B is correct

Answer:

The planets spun in epicycles.

Explanation:

Ptolemy's model used to explain that the planets spun in epicycles.

What is Ptolemy's model? How it was explained?

           Ptolemy placed the Earth at the center of the geocentric model. The system of planetary motions according to which the earth is at the center with the sun, moon, and planets revolving around it and each orbit except for the sun and moon is composed of a principal circle upon which moves a smaller circle carrying the planet. As he knows about the planetary motions and ideas about the universe was a set of spheres that surrounds the earth. He also believed that the moon has the orbit which is closest to the earth, the Mercury , the Venus and the sun.

      According to Ptolemy he considered and mentioned completely about 48 constellations.

Hence, Option A is the correct answer.

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Answer:

where is the section?huh,I need to know

The formula for calculating density is expressed as

Density = mass/volume

From the information given,

mass of empty pycnometer = 10.2

mass of the same pycnometer with an unknown liquid is 21.8.

Mass of unkown liquid = 21.8 - 10.2 = 11.6

volume of unknown liquid = 7

Thus,

Density = 11.6/7

Density = 1.7 g/ml

a. It takes about 6.06 seconds to rotate through the first 3.61 rev.

b. It takes about 6.06 seconds to rotate through the next 6.98 rev.

We can use the following kinematic equations of rotational motion to solve this problem:

θ = θ + ωt + (1/2)αt

ω = ω + αt

here:

θ is the angle rotated (in radians)

ω is the angular velocity (in radians/s)

\(w_1\) is the initial angular velocity (in radians/s)

α is the angular acceleration (in radians/s)

t is the time (in seconds)

(a) To find the time it takes to rotate through the first 3.61 rev, we need to convert 3.61 rev to radians:

3.61 rev * (2π rad/1 rev)

= 22.63 rad

Using the equation for angular acceleration, we can find the final angular velocity of the merry-go-round:

ω = \(w_1^{2}\)  + 2αθ

ω = 0 + 2(1.49 rad/s)(22.63 rad)

ω = 9.03 rad/s

Now we can use the equation for angular velocity to find the time it takes to rotate through the first 3.61 rev:

ω = ω + αt

t = (ω - \(w_1\)) / α

t = (9.03 rad/s - 0) / 1.49 rad/s

t ≈ 6.06 s

Therefore, it takes about 6.06 seconds to rotate through the first 3.61 rev.

(b) To find the time it takes to rotate through the next 3.61 rev, we can use the same equation for angular velocity:

ω = ω + αt

Since the merry-go-round starts from rest again, the initial angular velocity is 0. We already know the final angular velocity from part (a), so we can solve for the time:

t = (ω - \(w_1\)) / α

t = (19.03 rad/s - 0) / 2.49 rad/s

t ≈ 6.98 s

Therefore, it takes about 6.06 seconds to rotate through the next 6.98 rev.

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Answer:

46

Explanation:

Answer:

Refer the above attachment

The lamp uses 720 Joules of energy when it is switched on for 60 seconds.

Energy = Power x Time

where Power = Voltage x Current.

Given that the lamp is rated 6V and 2A, we can calculate its power as:

Power = Voltage x Current = 6V x 2A = 12W

We also know that the lamp is switched on for the 60s, so the time is:

Time = 60s

Energy = Power x Time = 12W x 60s = 720 Joules (J)

Energy is a fundamental concept in physics that refers to the ability of a system to do work or cause a change. it is a scalar quantity, which means that it has magnitude but no route. In physics, power is measured in gadgets of joules (J).

There are several different forms of energy, including kinetic energy, potential energy, thermal energy, chemical energy, and electromagnetic energy. Kinetic power is the power of motion, at the same time as potential electricity is the electricity that an item has due to its position or configuration. Thermal energy is the energy associated with the temperature of an object or system, while chemical energy is the energy stored in chemical bonds. Energy can be transformed from one form to another, but the total amount of energy in a closed system remains constant, according to the law of conservation of energy.

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