Zero is the freezing temperature of water on which temperature scale?

Kelvin
Fahrenheit
Pascal
Celsius

Answer:

Molar mass of NH3=14+3=17g

\(mole = \frac{given \: mass}{molar \: mass} \\ mole = \frac{28}{17} \\ mole = 1.65\)

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The star is moving away from Earth at a velocity of 1.8 x 106 m/s.

The Doppler Effect describes the shift in wavelength of a wave when the source is moving in relation to the observer. The shift can be observed in sound waves, light waves, and other waves.

The Doppler Effect can be used to determine the velocity of objects moving away from an observer, as in the case of stars moving away from Earth.

The velocity of a star moving away from Earth can be determined using the equation:

v = Δλ/λ x c, Where v is the velocity of the star, Δλ is the shift in wavelength of the spectral line, λ is the wavelength of the spectral line measured in the lab on Earth, and c is the speed of light (3.00 x 108 m/s).

In this case, the shift in wavelength of the spectral line is Δλ = 500.3 nm - 500 nm = 0.3 nm.

The wavelength of the spectral line measured in the lab on Earth is λ = 500 nm.

Plugging in these values to the equation above: v = Δλ/λ x cv = (0.3 nm / 500 nm) x (3.00 x 108 m/s) = 1.8 x 106 m/s.

Therefore, velocity of star 1.8 x 106 m/s.

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From the calculation, the activity of the isotope is 70.7 Bq.

We define the term half life as the amount of a radioactive isotope that is left after a given time. It is in fact the time that it takes for only half of the amount of the radioactive isotopes that is in a sample to remain.

Recall that if a substance is radioactive, this implies that the sample is capable of spontaneous disintegration. The amount of the sample that is present tends to diminish in the system as time increases.

Give the fact that;

Ao = initial activity = 100Bq

A = activity after time t = ??

Time taken = 5 minutes

Half life of the isotope = 10 minutes

Now we know that;

A/Ao = (1/2)^t/t1/2

A/100 = (1/2)^5/10

A/100 =  (1/2)^1/2

A =  (1/2)^1/2 * 100

A = 70.7 Bq

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Answer:

light bends away from the normal when it moves from air into water-refraction

Answer: C.) Light slows down when it moves from air into water.

Explanation: i hope this helps :)

When the water balloon is thrown from the second floor window, it accelerates due to gravity and its velocity increases as it falls. At the moment the balloon hits the ground, it will be travelling at 12.0 m/s.

This is because the balloon has been subject to a constant acceleration of 9.81 m/s throughout its entire fall, and so its velocity at the point of impact will be the same as its initial velocity when it was first released.

Therefore, the balloon will be travelling at 12.0 m/s when it hits the ground. This figure can be expressed to three significant figures as 12.0 m/s.

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Answer:

all of the above conditions are necessary for electric current to flow

Explanation:

mark as brainliest

Answer:

The answer is B

The diagram of  free body diagram represents the forces acting on an object the moment the applied is removed ,but while the object is still moving forward is attached in the answer.

The relative strength and direction of all forces operating on an object in a specific circumstance can be depicted using free body diagrams (FBDs), which are helpful tools. The careful creation of a free-body diagram is a prerequisite for the analysis and description of the majority of physical processes. In a free body diagram, the size of the arrow represents the force's magnitude, while the direction of the arrow represents the way it acts.

Describes what a free body diagram is: A graphic, dematerialized, symbolic representation of the body (a structure, element, or fragment of an element) in which all connecting "parts" have been eliminated is known as a free-body diagram.

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Resistance is a property of a device while resistivity is a property of a material. Resistance refers to how well a device or material opposes electric current, whereas resistivity refers to the inherent capability of a material to resist the flow of electric current.

Here are the meanings of the other terms in the options:Ammeter: An ammeter is an instrument that measures the electric current in a circuit.Voltmeter: A voltmeter is a measuring instrument that measures the potential difference between two points.

Conductor. A conductor is a material that conducts electricity well.Insulator: An insulator is a material that does not conduct electricity well.

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Answer:

Objects moving in circles possess a speed which is equal to the distance travelled per time of travel. By multiplying the rotational frequency with the circumference, we can determine the average speed of the object.

Answer:

don't know

Explanation:

can you give the other parts of the question?

Answer:

2.89 m/s²

Explanation:

From the question given above, the following data were obtained:

Radius (r) = 100 m

Velocity (v) = 17 m/s

Acceleration (a) =.?

The acceleration of a circular motion is defined by:

a = v²/r

Where:

a is the acceleration.

v is the velocity.

r is the radius.

With the above formula, we can obtain the acceleration of the car as follow:

Radius (r) = 100 m

Velocity (v) = 17 m/s

Acceleration (a) =.?

a = v²/r

a = 17²/ 100

a = 289/100

a = 2.89 m/s²

Therefore, the acceleration of the car is 2.89 m/s²

Answer:The energy of nuclear fission is released as kinetic energy of the fission products and fragments, and as electromagnetic radiation in the form of gamma rays; in a nuclear reactor, the energy is converted to heat as the particles and gamma rays collide with the atoms that make up the reactor and its working fluid.

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The Solar Constant (S) is expected to be lower for the Sun's radiation reaching Mars.

The Solar Constant represents the amount of electromagnetic radiation Earth receives from the Sun, which is approximately 1360 W/m2. However, when this radiation reaches Mars, it is expected to be lower than this value. There are a few reasons for this.

Firstly, Mars is farther away from the Sun compared to Earth. The distance between Mars and the Sun can vary significantly due to their elliptical orbits. On average, Mars is about 1.5 times farther from the Sun than Earth. As a result, the intensity of solar radiation reaching Mars is reduced due to the increased distance it needs to travel.

Secondly, Mars has a much thinner atmosphere compared to Earth. Earth's atmosphere helps scatter and absorb a portion of the Sun's radiation, resulting in a lower amount of energy reaching the surface. Mars, on the other hand, has a much thinner atmosphere, which offers less protection and results in less scattering and absorption of solar radiation. As a result, a larger portion of the solar radiation that reaches Mars directly reaches its surface.

Lastly, Mars has a lower albedo compared to Earth. Albedo refers to the reflectivity of a planetary surface. Mars has a reddish surface with a relatively low albedo, meaning it absorbs more solar radiation compared to Earth, which has a higher albedo due to the presence of clouds, ice, and reflective surfaces like water bodies.

Considering these factors, the Solar Constant for the Sun's radiation reaching Mars is expected to be lower than the value observed on Earth.

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The  is that the velocity of water flow in the pipe on the second floor is 13.6 m/s.

To calculate the velocity of water flow on the second floor, we can use Bernoulli’s principle which states that the pressure and speed of a fluid are inversely proportional to each other. Pressure + (1/2) * Density * Velocity^2 + Density * g * Height

= Constant (where g = acceleration due to gravity)In this problem, since the pressure remains unchanged, we can eliminate the first term on both sides of the equation for both positions. Using Bernoulli’s principle for position 1 and 2 as:

(1/2) * Density * Velocity1^2 + Density * g * H1 = ConstantPosition 2:

(1/2) * Density * Velocity2^2 + Density * g * H2

= ConstantConstant

= (1/2) * Density * Velocity1^2 + Density * g *

H1Taking the difference of the above equations we get:1/2 * ρ * (V2^2 - V1^2)

= -ρghV2^2 - V1^2

= -2ghV2^2 = V1^2 - 2ghV2

= √(V1^2 - 2gh)

The negative sign is ignored as it represents the direction of flow. Putting the values we get:

V2 = √(15^2 - 2 × 9.81 × 3)

= 13.6 m/s

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Options:

Answer:

Most of the water that forms the oceans of Earth arrived by way of impacts with Kuiper Belt comets.

Explanation:

Note, a comet is a celestial body made of ice which releases gases when it orbits close to the Sun. Deuterium is a type of element which can be found in comets and in our oceans on earth. Deuterium is considered an isotope of hydrogen.

Hence, because of the similarities between the Deuterium and Hydrogen, some scientists promote the theory that most of the water that forms on oceans of the earth likely arrived by the impact with Kuiper Belt comets.

Planets composed of rock and metal are found in the Terrestrial Solar System.

The Solar System is divided into two main types of planets based on their composition and characteristics: the Terrestrial Planets and the Jovian (or Gas Giant) Planets.

The Terrestrial Planets are located closer to the Sun and are characterized by their rocky and metallic compositions. These planets include Mercury, Venus, Earth, and Mars.

They have relatively high densities and solid surfaces. Their atmospheres, if present, are much thinner compared to the gas giants.

On the other hand, the Jovian Planets, also known as Gas Giants, are located farther from the Sun. These planets, namely Jupiter and Saturn, as well as the ice giants Uranus and Neptune, are composed primarily of hydrogen and helium gases.

They have low densities compared to the Terrestrial Planets and are characterized by thick atmospheres predominantly composed of hydrogen and helium.

Therefore, planets rich in low-density gases are found in the Jovian or Gas Giant part of the Solar System, while planets composed of rock and metal are found in the Terrestrial Solar System.

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Answer:

magnetic force due to gravity

Explanation:

nowno that is because that's what the geography teacher taught us back in don't remember but it's true

time should you wait between pushes is 2.83 sec.

the question is incomplete, full statement is-

A 24 kg child sits on a 2.0-m-long rope swing. You are going to give the child a small, brief push at regular intervals. If you want to increase the amplitude of her motion as quickly as possible, how much time should you wait between pushes?

In physics, amplitude refers to the greatest displacement or distance that a point on a vibrating body or wave may move relative to its equilibrium location. It is equivalent to the vibration path's half-length.

regular interval - at similarly spaced intervals: having the same interval of time between occurrences From 4 a.m. to midnight, the buses operate at regular intervals. The boards are positioned at regular intervals, with an equal amount of space between each.

The length of swing, l = 2.1 m

The time between the pushes is nothing but the Time period

and is given by the formula,

\(T = 2\pi ( \frac{l}{g} )^{\frac{1}{2} }\)

= 2 * 3.14 ( 2.0/ 9.8 ) ^ (1/2)

= 2.83 sec

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Answer:

 its not long dummy, its your imagination

Explanation:

If you measure the average brightness and pulsation period of a cepheid variable star, you can also determine its distance.

Cepheid variable stars belong to a class of stars that have a distinct relationship between variation period and luminosity.

Their period of cycle and luminosity are closely related to each other and they differ in temperature and diameter.

As their brightness increases and decreases, therefore, it helps out in the measurement of intergalactic and interstellar distances.

The changes in amplitude of their motion and cycle period have a definite impact on their brightness which enables us to determine their distance.

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Answer: A

Explanation:Convection currents in the mantle Mantle convection is the very slow creeping motion of Earth's solid silicate mantle caused by convection currents carrying heat from the interior to the planet's surface. The Earth's surface lithosphere rides atop the asthenosphere and the two form the components of the upper mantle.

Answer:

B

Explanation:

Short-wavelength light (violet) has higher energy and frequency than long-wavelength light (red).

Visible light is a type of electromagnetic radiation that includes different wavelengths, with violet being the shortest and red being the longest. Each color corresponds to a specific wavelength range, with violet having a wavelength of around 400-450 nanometers (nm) and red having a wavelength of around 620-750 nm.

Since violet light has a higher frequency (and thus more energy) than red light, it can cause more damage to biological tissues, such as the eyes and skin. This is why prolonged exposure to UV light, which has even shorter wavelengths than violet light, can lead to sunburn and skin cancer.

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Answer:

0.0231 m/s

Explanation:

Given the question :

A small toddler is playing in his yard. Over the course of 29.01 s, he walks 2.099 m S before turning N and walking 1.429 m. What is his average velocity?

Distance walked south = 2.099 metre

Time taken = 29.01s

Distance walked north = 1.429 metre

Average Velocity = Displacement / time

The Displacement is hence,

(2.099 m - 1.429m) = 0.67m

Average Velocity = 0.67m / 29.01s

Average Velocity = 0.02309 m/s

Average Velocity = 0.0231 m/s

Answer:

-1.5 m/s^2

Explanation:

Acceleration is Final velocity - Initial Velocity/Time (seconds)

30-48= -18

-18/12 = -1.5

-1.5 m/s^2

The unit of momentum depends on the system of units used to express its constituent quantities. In the International System of Units (SI), momentum is given by the product of mass and velocity, and its unit is kilogram meters per second (kg·m/s).

Symbolically, momentum can be expressed as:

p = m * v

Where p represents momentum, m represents mass, and v represents velocity.

Other common units of momentum include:

gram centimeter per second (g·cm/s)

newton second (N·s)

pound foot per second (lb·ft/s)

The momentum is a vector quantity, which means it has both magnitude and direction. Therefore, the units of momentum are always accompanied by a direction, which is usually indicated using a positive or negative sign or a vector notation.

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A satellite is in a circular orbit around Earth, so the scenario that will increase the period of the satellite is decreasing the radius of the orbit, which is in Option A because it is determined by the radius of the orbit and the mass of Earth.

The motion of a satellite in a circular orbit around a central body, such as Earth, is governed by the balance between the gravitational force acting on the satellite and the centripetal force required to keep the satellite in its circular path, so the period is proportional to the square root of the cube of the radius, so decreasing the radius will increase the period.

As a result, the scenario in Option A that increases the satellite's period is when the the orbit's radius decreases.

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Answer: Igneous it forms because of magma but magma is under the earths surface so its Igneous

Explanation:

Answer:

its metamorphic.

Explanation:

The pump head is -42.065 m

Since the pump head is negative, the pump is unable to push the water to the height of 20 m, and additional work must be done to overcome the frictional losses in the pipe.

The pump head is equal to the total head minus the frictional head loss. The total head can be calculated as follows:

h_total = h_static + h_dynamic

where h_static is the static head, which is equal to the difference in height between the reservoir and the point 20 m higher, and h_dynamic is the dynamic head, which is a measure of the pressure generated by the flow of water.

h_static = 20 m

To calculate the dynamic head, we need to first calculate the velocity of the water in the pipe. We can use the equation of continuity, which states that the flow rate through a pipe must remain constant along its length.

Q = A * v

where Q is the flow rate (0.01 m^3/s), A is the cross-sectional area of the pipe (pi * (d/2)^2), and v is the velocity of the water.

A = pi * (0.15/2)^2 = 0.00176 m^2

v = Q / A = 0.01 / 0.00176 = 5.68 m/s

Next, we can calculate the dynamic head using the Bernoulli equation:

h_dynamic = (v^2) / (2g)

where g is the acceleration due to gravity (9.8 m/s^2).

h_dynamic = (5.68^2) / (2 * 9.8) = 16.06 m

Finally, we can calculate the total head:

h_total = h_static + h_dynamic

= 20 + 16.06

= 36.06 m

The pump head is then:

h_pump = h_total - h_friction

= 36.06 - (35^2) / (2 * 9.8)

= 36.06 - 78.125

= -42.065 m

Since the pump head is negative, it means that the pump is unable to lift the water to the desired height of 20 m, and additional work must be done to overcome the frictional losses in the pipe.

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