The distance between two consecutive nodes of a standing wave is 21.9 cm. the hand generating the pulses moves up and down through a complete cycle 2.13 times every 3.65 s. find the velocity of the wave. answer in units of m/s.

Answer:

2 phosphorus and 5 oxygen

Explanation:

The chemical formula of the substance is:

[tex]P_2 O_5[/tex]

where each subscripts indicates the number of atoms of each element. We see that P (phosphorus) has a subscript '2' while O (oxigen) has a subscript '5', so the correct answer is

2 phosphorus and 5 oxygen

The amplitude of a wave is defined as the vertical distance from a crest (or trough) to the rest (equilibrium) position of the wave. Thus, to determine the amplitude, one must measure this vertical distance.

The amplitude of a wave is the measure of the maximum displacement of the medium from its rest position. It can be seen as the 'height' of the wave, and it's measured vertically. If we consider a wave to be symmetrical, the crest (top of the wave) is distance +A above the equilibrium (resting) position, and the trough (bottom of the wave) is distance -A below it.

Thus, the amplitude refers to the vertical distance from a crest (or trough) to the rest position. In simpler terms, to find the amplitude, measure the vertical distance from a crest to the rest position. Hence, the correct answer is D: the vertical distance from a crest to the rest position.

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To calculate the electron current driven through the iron wire, we need to find the drift velocity and the number of free electrons per cubic meter. By using the formula I = nqAvd, we can calculate the current.

The electron current driven through the iron wire can be calculated using the formula I = nqAvd. Given that the electric field is 0.063 V/m, we need to calculate two quantities: the drift velocity (vd) and the number of free electrons per cubic meter(n). We can then substitute these values into the equation to find the current (I).

To calculate the drift velocity (vd), we need to calculate the number of free electrons per cubic meter (n). We can use the density of iron (8.80 × 10³ kg/m³) and the atomic mass of iron (63.54 g/mol) along with Avogadro's number (6.02 × 10²³ atoms/mol) to determine n.

Finally, substituting the values of n, q, A, and vd into the equation I = nqAvd, we can calculate the electron current driven through the iron wire.

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Before going to answer  this question first we have to know something about friction.

Friction is the opposing force which is due to interlocking of irregularity and wielding effect.In our naked eye a surface may  look smooth, but at microscopic level, it has elevations and depressions.

A rough surface has more friction as compared to a smoother surface as smoother surface has less irregularity.

Again we know that that rolling friction is less than sliding friction.so whenever the object will be placed  on a wheel,so there will be less friction.

Again we know that the frictional force is directly proportional to the normal reaction.

The empirical formula for frictional force F= coefficient of friction × normal reaction[tex]i.e F=\mu*N[/tex]

so whenever the mass increases ,correspondingly there will be increment in normal reaction which results in the increment in kinetic friction.

But one thing we have to remember that friction is also dependent on contact area.As long as the contact area is same ,there will be no increment in friction due to increment in mass.

So the first answer is partially correct.

To convert 140 degrees Fahrenheit to Celsius, subtract 32 from the Fahrenheit temperature and multiply the result by 5/9, resulting in 60 degrees Celsius.

To convert a temperature from Fahrenheit to Celsius, we can use the formula: C = (F - 32) × 5/9, where F is the temperature in degrees Fahrenheit and C is the temperature in degrees Celsius. So, for a heater set to 140 degrees Fahrenheit, the conversion to Celsius would be:

C = (140 - 32) × 5/9

C = (108) × 5/9

C = 60

Therefore, 140 degrees Fahrenheit is equal to 60 degrees Celsius. This knowledge is essential when discussing the power needed to keep a house warm, as energy requirements are usually given in watts per degree Celsius (W/°C).

The quadratic function equation that describes the height of the rock is h = -16t^2 + 16t + 5.

To write a quadratic function equation that describes the height h at time t, we can use the kinematic equation for vertical motion: h = -16t^2 + 16t + 5. This equation represents the height of the rock as a function of time, taking into account the initial height, initial velocity, and acceleration due to gravity. The coefficient -16 in front of t^2 accounts for the downward acceleration of the rock.

Answer: The California Current and the Gulf Stream.

Explanation:The Gulf Stream is on the East coast it runs southward to northward While The California Current which is also a part of the North Pacific Gyre moves southward along the westward coast if America and ends off at the southward Baja California peninsula.

The California Current is a Pacific Ocean current.

Other Currents in America are Humboldt Current, the Canary Current, the Benguela Current, and the Somali Current.

Answer:

Kelvin, Celsius, and Fahrenheit

Explanation:

Answer:

A.

Explanation:

just took it on e2020

Answer: B ; created and destroyed

Explanation:

According to the law of conservation of energy, energy can neither be created nor destroyed but can be converted from one form to another

Which simply means you can't create energy and at the same time you can't destroy it.

An energy can be converted from one form to another that is from potential energy to kinetic energy

There is no destruction of energy in such a process

The Law of Conservation of Energy states that energy cannot be created or destroyed. This means that the total amount of energy in a system remains constant. When energy appears to disappear, it has typically been converted to another form.

According to the Law of Conservation of Energy, energy cannot be created or destroyed. This is a fundamental law in physics that states that the total amount of energy in an isolated system remains constant over time. For example, when a ball drops from a height, its potential energy is transformed into kinetic energy as it falls, but the total energy within the system (the ball and the Earth) doesn't change. Therefore, the correct answer is C: created or destroyed.

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Final answer:

A hard mineral with the same color as its streak is likely a metallic mineral, with examples including hematite and galena. The streak test is performed using an unglazed porcelain plate to reveal the color of the mineral's powder form.

Explanation:

The mineral in question, which is hard and has the same color as its streak, could refer to one of the metallic minerals, as they often have a streak color that is indicative of their actual color. Examples include hematite, with a dark gray on hand-sample but a red-brown streak, or galena, which has a dark gray streak matching its dark gray appearance. To determine the streak color, one can perform a streak test by rubbing the mineral across an unglazed porcelain plate. This test is useful because the powder form of the mineral may show colors that are different from the bulk mineral due to the particle size affecting how light is absorbed and reflected.

Final answer:

The kinetic energy of the emitted electrons when cesium is exposed to UV rays of frequency 1.9 × 10¹⁵ Hz is approximately 9.51 × 10⁻¹⁹ J.

Explanation:

To find the kinetic energy of the emitted electrons, we need to use the equation:

Kinetic Energy (KE) = Energy of the photon - Work Function

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

Energy (E) = Planck's constant (h) × frequency (f)

Given that the frequency of the UV rays is 1.9 × 1015 Hz, we can calculate the energy of the photon. The value of Planck's constant is 6.626 × 10-34 J·s.

Let's calculate the energy:

E = (6.626 × 10-34 J·s) × (1.9 × 1015 Hz) = 1.2594 × 10-18 J

Now we need to find the work function of cesium, which represents the minimum energy required to remove an electron from the metal. The work function of cesium is approximately 1.93 eV.

Converting the work function to joules:

1 eV = 1.602 × 10-19 J

1.93 eV = 1.93 × (1.602 × 10-19) J = 3.08786 × 10-19 J

Now we can calculate the kinetic energy:

KE = (1.2594 × 10⁻¹⁸ J) - (3.08786 × 10⁻¹⁹J) = 9.50712 × 10⁻¹ J

Therefore, the kinetic energy of the emitted electrons when cesium is exposed to UV rays of frequency 1.9 × 10¹⁵ Hz is approximately 9.51 × 10⁻¹⁹ J.

Answer:

Distance = 18 +8+ 27+8 =61

Displacement 27 - 18 = 9

Explanation:

Answer: the Fourth diagram

Explanation: The fourth diagram shows movement from her origin with the arrows indicating her movement 3metres east, from where she turns north and walks 4 metres the arrows indicates that. The resultants 5meters indicates her return back to her starting point with the arrow pointing at the tail of the 3metres.

Final answer:

The correct option is A Perihelion. Perihelion is the event that occurs in January when the Earth is closest to the Sun, and it results in the Earth being approximately 91.5 million miles from the Sun.

Explanation:

The event that occurs in January when the Earth is closest to the Sun is called perihelion. This is the point in Earth's elliptical orbit where it is at the minimum possible distance from the Sun. The Earth reaches perihelion approximately around January 3rd, depending on the year, with a slight variation over time.

At perihelion, the Earth is about 91.5 million miles from the Sun, as opposed to during aphelion, the farthest point, when it is about 94 million miles away. During this time, despite the Earth receiving more heat from the Sun, the Northern Hemisphere experiences winter because of the axial tilt directing this hemisphere away from the Sun.

Over long periods, the dates of perihelion and aphelion gradually shift due to the precession of the Earth's orbit. This change can have significant climatic effects over geological timescales.

Static friction ensures forces are balanced when an object is at rest by matching the applied force up to its limit. This balance means that the net external force on the object is zero. Such conditions imply static equilibrium.

When an object is at rest and static friction is acting on it, the forces are said to be balanced. This state of balance or equilibrium exists because the net external force on the object is zero. According to Newton's first law, an object will remain at rest if no unbalanced force acts on it.

To break it down step-by-step:

For example, consider a heavy crate on the ground. When you apply a small force to push it, if the crate does not move, the force of static friction equals the applied force but in the opposite direction. This indicates static equilibrium where forces are balanced.

To further understand, let's note that static friction does no work because the point of contact does not move relative to the surface. This characteristic helps in identifying balance as no work is done when forces are perfectly equal and opposite.

Particles in metals are strongly held by the intermolecular force called metallic bonds. This strong bonding make the metals hard, feasible to conduct thermally and electrically.

Metals are electropositive elements in periodic table. The alkali metals, alkaline earth metals and transition metals compose the metallic elements. They all shows the metallic properties such as conductivity, malleability, ductility, luster etc.

Metal are consists of a sea of mobile electrons amidst the pool of positive ions. The metallic particles form a well ordered crystal lattice structure with metal ions connected by strong metallic bonds.  The electrons can delocalize into the interstices and make the metal lattice conductive.

The close packed structure of metallic particles with free electrons make metals highly conductive both thermally and electrically. Moreover they exhibit color by the transition of electrons with absorption energy.

To find more on metals, refer here:

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The required relation is given in the figure below

There are three main types of plate boundaries:

Answer:

Option C is correct, 19,600N

Explanation:

Gravitational acceleration (symbolized g) is a physics term that denotes the strength of a gravitational field. It's measured in meters per second squared ([tex]m/s^{2}[/tex]). 1 g is approximately 9.8 [tex]m/s^{2}[/tex] at the earth's surface.

hence, Option C is correct, 19,600N

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The answer is Granitic rock

Granite is a light-colored igneous rock with pieces that are large enough to be visible with the naked eye. It is formed from the slow crystallization of magma below Earth's surface which we call as lava. Granite is composed mainly of quartz and feldspar with very small amounts of mica, amphiboles, and other minerals. If we talk about Andesitic rocks, they contain mineral compositions between those of granite and basaltic rocks.