When one of the authors was a teenager, the rate of rotation for popular music records on a record player was 78 RPM. The rotational velocity in rev/s is____?
The number of revolutions made in 5 s is_____

Answer:

False. Momentum of particle is inversely proportional to wavelength.

Explanation:

The momentum of a particle is related to its de Broglie wavelength, according to the de Broglie wavelength equation:

λ = h / p

where λ is the wavelength, h is the Planck constant, and p is the momentum of the particle. As we can see from the equation, as the momentum increases, the wavelength decreases.

Therefore, as the momentum of a particle of mass m increases, its wavelength decreases, not increases.

Answer:

c

Explanation:

answer is c I hope it is correct

Answer:

B is your answer

Explanation:

C, D, and A are true and protons are located inside the nucleus and electrons are located outside the nucleus which means B is your answer.

In the chemical reaction described in the passage, the product is Ammonia (NH₃)

A chemical reaction is a procedure that causes one group of chemical components to change chemically into another.

Chemical reactions, which can frequently be described by a chemical equation, traditionally include changes that only affect the locations of electrons in the formation and dissolution of chemical bonds between atoms, with no change to the nuclei (no change to the elements present).

The given chemical reaction of  chemical factories  is:

H₂ + N₂ → NH₃

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The change in gravitational potential energy of the dog is -176.58 J.

The change in gravitational potential energy of an object is given by:

ΔPE = mgh

where

ΔPE is the change in gravitational potential energy

m is the mass of the object

g is the acceleration due to gravity, and

h is the change in height.

In this case, the dog jumps off a 10 m staircase down to his doggy house which is 4 m high. So the change in height,

h = -6 m (negative because the dog is moving downwards).

g = 9.81 m/s^2

m = 3 kg.

Substituting these values into the equation above, we get:

ΔPE = mgh

ΔPE = (3 kg)(9.81 m/s^2)(-6 m)

ΔPE = -176.58 J

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Answer:

Yes

Explanation:

Objects with greater mass have more gravity. For example a feather and a phone. A feather falls slower than a phone becasue their is less gravity.

Hope this helps :)

Project A's MIRR (Modified Internal Rate of Return) is 8.00%.

To calculate MIRR, follow these steps:

1. Determine the project's cash flows, including initial investment and future cash inflows.

2. Calculate the present value of cash inflows by discounting them at the project's cost of capital.

3. Calculate the future value of cash inflows by compounding them at the project's reinvestment rate.

4. Determine the number of periods in the project's life.

5. Calculate MIRR by finding the discount rate that equates the present value of cash outflows to the future value of cash inflows, raised to the power of 1 divided by the number of periods, minus 1.

MIRR is a more accurate measure of a project's profitability than IRR (Internal Rate of Return) as it takes into account the reinvestment rate of cash inflows, making it a better tool for evaluating and comparing projects.

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Answer:

0.369 V

Explanation:

Given :

Capacitance ( c ) = 650 × 10–4 F

Charge ( q ) = 24 × 10–3 C

We are asked to find potential difference ( v )!

We know:

q = c v

= > v = q / c

Putting values here we get:

= > v = ( 24 × 10–3 ) / ( 650 × 10–4 ) V

= > v = 240 / 650 V

= > v = 24 / 65 V

= > v = 0.369 V

Therefore, potential difference between the plates is 0.369 V

Answer:

Answer 3: When a balloon goes up higher in the air, its size will increase. Since there's less air in the upper atmosphere, there's less stuff pushing back on the balloon, and hence the pressure is lower, which allows the balloon to expand

Answer: C

Explanation:

As the balloon rises, the gas inside the balloon expands because the atmospheric pressure surrounding the balloon drops. The atmosphere is 100 to 200 times less dense at the float altitudes than on the ground. and as the air is heated inside the balloon it causes it to rise upwards (because it is lighter than the cooler air on the outside). When the pilot needs to bring the balloon down again, he simply reduces the temperature of the air inside the balloon causing it to slowly descend.

In an electrical circuit containing only XC, the power factor is said to be zero. In this circuit, the power supplied by the source does not get dissipated in the circuit, but it is stored in the electric field of the capacitor. Therefore, the apparent power is equal to the reactive power (VARs).

When the circuit has only capacitive reactance, the power factor is said to be lagging.A reactive circuit that only has capacitive reactance has a power factor of zero. As a result, the power supplied by the source is not used by the circuit; rather, it is stored in the electric field of the capacitor.

The circuit's power factor is determined by the cosine of the phase angle between the voltage and current. When the power factor is zero, the cosine of 0 degrees is one, whereas the cosine of 90 degrees is zero. A capacitor in a circuit resists changes in voltage, storing energy when the voltage is high and releasing energy when the voltage is low.

This causes the phase angle between the voltage and current to be 90 degrees, and since the power factor is determined by the cosine of the phase angle, a circuit with only capacitive reactance has a power factor of zero. In order to achieve unity power factor, reactive power compensation equipment such as capacitors or inductors are added to the circuit.

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The speed of the car when it is half –way down the hill is 7m/s.

This is another illustration of energy conservation. Set the potential energy at the top to equal the kinetic energy at the bottom, then solve for height h and then  speed using the same total energy at h/2.

Top:

mgh = (1/2)mv2

hear m=mass

        h=Hight

        v= speed

gh = v2/2

h = v2/(2g)

= 102/[2(9.8)] m

= 5.1 m

Half way down:

u = speed

g(h/2) = u2/2

u = √[2g(h/2)]

= √(gh)

= √[(9.8)(5)] m/s

= 7.0 m/s

What is Kinetic energy?

the energy that an object produces as a result of its motion. There is unquestionably a need to apply particular forces when an object is prepared to accelerate. Applying force requires work, and once the job is finished, energy is transmitted to the object, causing it to move with a constant speed.

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answers

81.6 pounds rounded or just 81.571 if it needs to be exact

Answer:

The final velocity of the train and the moose after collision is approximately 19.51 m/s

Explanation:

The given mass of the moose, m₁ = 250 kg

The velocity of the moose, v₁ = 0

The mass of the oncoming train, m₂ = 10,000 kg

The velocity of the train, v₂ = 20 m/s

The velocity of the moose and the train after collision = v₃

By the principle of conservation of linear momentum, the total initial momentum before the collision = The total final momentum after collision

m₁·v₁ + m₂·v₂ = (m₁ + m₂)·v₃

Therefore, by substitution, we have;

250×0 + 10,000× 20 = (10,000 + 250) × v₃

200,000 = 10,250 × v₃

v₃ = 200,000/10,250 ≈ 19.51 m/s

The final velocity of the train and the moose after collision = v₃ ≈ 19.51 m/s

Answer:

-10.8m/s^2

Explanation:

a=change in velocity/change in time

-27 m/s/2.5=10.8m/s^2

or if its not negative

27m/s/2.5=10.8m/s^2

Answer:

Explanation:

Answer:

Formula = D = m/v

Given value of D = 19.3 and m = 13g

19.3 = 13/v

V × 19.3 = 13

v = 13/19.3

v = 0.67

The vector BR in unit vector notation is:

BR = 8.485 î + 8.485 j

What is Vector?

Vectors can be added together to find the result, which is known as the vector sum. The vector sum can be found using the head-to-tail method, where the tail of one vector is placed at the head of the other vector. The vector sum is the vector that goes from the tail of the first vector to the head of the second vector.

To write the vector BR in unit vector notation, we need to find its components in the i and j directions.

Given that the magnitude of the vector is 12.0 and it makes an angle of 45 degrees with the positive x-axis, we can use trigonometry to find the components.

The x-component (i-direction) of the vector is given by:

Bx = B cos θ = 12.0 cos 45° = 8.485

The y-component (j-direction) of the vector is given by:

By = B sin θ = 12.0 sin 45° = 8.485

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Answer:

36mm maybe sooo ok ......hehe

Answer:

C. sedimentary

Explanation:

Answer:

Sedimentary

Explanation:

Igneous rock- A rock that's formed through the cooling and solidification of magma or lava.

Metamorphic rock- A rock that starts out as another rock and often has a striped appearance.

Volcanic rock- A rock that's formed from lava that erupted from a volcano.

Sedimentary is the only right answer. A Sedimentary rock is a rock thats made from the deposition of lots of pieces of eroded rock particles.

Answer:

in the converson to cm³

l m= 100cm

what about :

l m³ = 1000×1000×1000

= 1000000cm³

After this we :

1 m³ = 1000000cm³

how about:

100m³ = 100 × 1000000cm³

= 100000000cm³

Answer:

DDDDDDDDDDDDDDDDDDDDDDDDDDD

The difference in sound between a guitar and a trombone playing the same note is primarily due to the difference in their timbre, which is influenced by the harmonic content and the way the sound is produced.

Timbre refers to the quality or character of a sound that distinguishes it from other sounds of the same pitch and volume. In the case of a guitar and a trombone playing the same note, the timbre differs because of the inherent characteristics of each instrument. The guitar produces sound through the plucking or strumming of strings, resulting in complex harmonic overtones and resonances.

On the other hand, the trombone produces sound by vibrating air through a metal tube and varying the length of the tube, which produces different harmonics and overtones. These variations in harmonic content and production method contribute to the distinct sound and timbre of each instrument, making them sound different even when playing the same note.

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The amount of energy that must be absorbed by the 150g sample of ice at 0.0°C is 131,873.55 J.

To calculate the amount of energy that must be absorbed by a 150g sample of ice at 0.0°C, we need to consider two processes: heating the ice from -273.15°C to 0.0°C and melting the ice at 0.0°C.

1. Heating the ice:

The specific heat capacity of ice is 2.09 \(\frac{J}{g ^\circ C}\), and the temperature change is 0.0 - (-273.15) = 273.15°C.

\(Q_1\) = (mass) × (specific heat capacity) × (temperature change)

\(Q_1\) = 150g × 2.09 × 273.15°C

\(Q_1\) =81,773.55 J

2. Melting the ice:

The heat of fusion (enthalpy of fusion) for ice is 334 J/g.

\(Q_2\) = (mass) × (heat of fusion)

\(Q_2\) = 150g × 334 J/g

\(Q_2\) = 50,100 J

The total energy required is the sum of Q1 and Q2:

Total energy = \(Q_1\) + \(Q_2\)

Total energy = 81,773.55 J + 50,100 J

Total energy = 131,873.55 J

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a) The unit vector in the direction of a is (0.993, 0.117).

b) The Cartesian vector representing the force is (24.825, 2.925).

c) The mechanical work done is 275 Joules.

The unit vector in the direction of vector a can be found by dividing vector a by its magnitude. In this case, vector a = [6, 1], so the magnitude of a is √(6² + 1²) = √37. Dividing vector a by its magnitude yields (6/√37, 1/√37), which simplifies to approximately (0.993, 0.117).

To find the Cartesian vector representation of the force, we multiply the unit vector from part a) by the magnitude of the force, F = 25 N. The result is (0.993 * 25, 0.117 * 25), which simplifies to (24.825, 2.925).

To determine the mechanical work done, we use the formula W = F * d * cos(θ), where W is the work done, F is the force, d is the displacement, and θ is the angle between the force and displacement vectors.

In this case, the force is F = 25 N, and the displacement is the difference between the x-coordinates of the two points, which is 15 - 4 = 11 meters. Since the force and displacement are in the same direction (θ = 0°), cos(θ) = 1.

Plugging in the values, we get W = 25 * 11 * 1 = 275 Joules.

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When ^227_89Ac undergoes alpha decay, the resulting nucleus is ^223_87Fr, with a decrease of 2 protons and 4 nucleons compared to Ac.

Alpha decay is a type of radioactive decay in which an atomic nucleus emits an alpha particle, which consists of two protons and two neutrons (equivalent to a helium nucleus). This process reduces the atomic number of the parent nucleus by 2 and its mass number by 4, resulting in the formation of a new nucleus. Alpha decay occurs in heavy, unstable nuclei to achieve greater stability by reducing their size and releasing excess energy.

When ^227_89Ac undergoes alpha decay, it emits an alpha particle, which consists of 2 protons and 2 neutrons. This means the resulting nucleus will have 2 fewer protons and 2 fewer neutrons compared to Ac.

Ac has an atomic number of 89, so after alpha decay, the resulting nucleus will have an atomic number of 89 - 2 = 87.

Ac has a mass number of 227, so the resulting nucleus will have a mass number of 227 - 4 = 223.

Therefore, the resulting nucleus is ^223_87Fr.

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Answer:

A. Perpendicular

Explanation:

Clarification:

The inquiry is inadequate as it does not have the picture of the rope wave movement.

From all that, we can say that;

The rope's are moving at the same time in a similar example without contacting one another.

This is hence a mechanical wave being made with the movement having motions that are opposite to the course of energy move of the ropes.

This is a meaning of cross over waves in light of the fact that the rope molecule movement is opposite to the wave movement.

Perpendicular describes the motion of the rope particles in relation to the motion of the rope wave shown in the photograph. Hence option A is Correct.

Wave is is a disturbance in a medium that carries energy as well as momentum . wave is characterized by amplitude, wavelength and phase.

Amplitude is the greatest distance that the particles are vibrating. especially a sound or radio wave, moves up and down. Amplitude is a measure of loudness of a sound wave. More amplitude means more loud is the sound wave.

Wavelength is the distance between two points on the wave which are in same phase.

Phase is the position of a wave at a point at time t on a waveform.

There are two types of the wave longitudinal wave and transverse wave.

Longitudinal wave : in which, vibration of the medium (particle) is parallel to propagation of the wave.  Sound wave is a longitudinal wave.

Transverse wave : in which, vibration of the medium (particle) is perpendicular to propagation of the wave. Light wave is a longitudinal wave.

In the picture we can see that wave is traveling in the direction out of the paper and rope particle is vibrating along Y axis perpendicular to the propagation of the wave.

Hence Perpendicular option is correct.

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