How fast is a plane that traveled 400 km in 30 minutes? Give the speed in km/hr.

The total mechanical energy of the bicyclist is 1400 J, obtained by adding her potential energy of 720 J and kinetic energy of 680 J. The correct answer is option B.

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(1).....opaque -object that not allow light to pass through it

we can't look through opaque objects

ex..wall

translucent... objects that all some light to pass through it

we can partially see through it

ex...coloured glass window

transparent... objects that wholly allow light to pass through it

we can clearly see through it

ex...glass of specs

(2)..the bouncing back of light from a smooth polished surface is called reflection of light

(3)/.....there must be a solid ,opaque to block light

there must be a source of light

there must be a surface to have shadow on it..

(6)...reflected images r formed by light reflection from a smooth polished surface while shadows are formed by blockage of light by an solid,opaque object...

Explanation:

we should talk here thanks

The critical angle of the transparent material is 35.3 degrees.

The critical angle is the angle of incidence at which the angle of refraction is 90 degrees. In this case, the angle of refraction is 32 degrees. Therefore, the critical angle is calculated as follows:

sin(critical angle) = sin(90 degrees) / sin(angle of refraction)

sin(critical angle) = 1 / sin(32 degrees)

sin(critical angle) = 0.574

critical angle = arcsin(0.574)

critical angle = 35.3 degrees

Therefore, the critical angle of the transparent material is 35.3 degrees.

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The eight planets in our solar system, including Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune, are on the ecliptic plane.

The ecliptic plane is defined as the imaginary plane in space that contains Earth's orbit around the sun. Since all of the planets in our solar system orbit the sun, they are also on this same plane. The planets' orbits are not perfect circles, but are rather slightly elliptical, meaning they can vary slightly from the ecliptic plane.

However, in general, the planets stay relatively close to the ecliptic plane as they orbit the sun. This is significant because it allows astronomers to make predictions and observations about the planets' movements and positions in the sky.

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Answer:

In physics, motion is the phenomenon in which an object changes its position over time. Motion is mathematically described in terms of displacement, distance, velocity, acceleration, speed, and time. ... One can also speak of motion of images, shapes, and boundaries.

Explanation:

The capacitance of a capacitor depends on the area of the plates, the distance between the plates, and the permittivity of the dielectric material and the correct option is (D)

The capacitance of a capacitor depends on the area of the plates, the distance between the plates, and the permittivity of the dielectric material between them.

It is clear that capacitance is directly proportional to the area of the plates and the permittivity of the dielectric material, and inversely proportional to the distance between the plates.

Now, let's come back to the question, which asks about the factor that does not affect the capacitance of a capacitor. The options given are the separation between the plates, the size of the plates, the charges on the plates, and none of the above.

The correct answer is option D, i.e., none of the above.

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A Stüve Diagram might be analyzed to determine all of the following except:The air temperature at a given altitude over an airfield.

A Stüve Diagram can be analyzed to determine the variability in temperature with height at a given location, the variation in air temperature along a flight path, and the variability in wind speed and direction with height at a given location. However, it cannot be used to determine the air temperature at a given altitude over an airfield as Stüve Diagrams do not provide information on specific altitudes, but rather show the vertical profile of atmospheric variables.

Option A is the correct answer of this question.

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An electric fan is turned off, and its angular speed decreases uniformly from 720 rev/min to 200 rev/min in a time interval of period 3.25.

In mechanics, acceleration is the price of trade of the rate of an item with recognition to time. Accelerations are vector quantities. The orientation of an item's acceleration is given by means of the orientation of the internet force performing on that item.

According to Newton's second regulation of movement, the acceleration of an object equals the internet force performing on it divided via its mass, or a = F m . This equation for acceleration can be used to calculate the acceleration of an object while its mass and the internet force appearing on it are regarded.

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In a simple electric generator, a conducting loop of wire is placed in a magnetic field. The loop of wire is then rotated because "Its motion through the magnetic field creates a current in the wire". The correct answer is B.

When a conducting loop of wire is placed in a magnetic field and rotated, it creates a current in the wire. This is due to the phenomenon of electromagnetic induction, which states that a changing magnetic field induces an electric current in a conductor.

As the wire loop rotates, the magnetic field passing through it changes, inducing an alternating current in the wire. This current can then be used to power electrical devices or stored in a battery. It is the motion of the wire through the magnetic field that generates the electric current, not the transformation of heat into magnetism.

Therefore, the correct answer is option B.

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Answer:

this much I think 101.9716212978

Answer:

approximately 102kg

Explanation:

1 kg on the surface of the Earth weighs 9.80665 N

1000 N = 1000/9.80665 kg = 102 kg

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The effective current associated with an electron in the lowest energy state of the hydrogen atom in the Bohr model is 6.63×10-7 A.

To calculate the effective current, we can use the formula:

I = qv/T

where I is the effective current, q is the charge of the electron, v is its velocity, and T is the time period of its circular orbit.

In the lowest energy state of the hydrogen atom, the electron is in a circular orbit with a radius of 5.29×1011 m and a speed of 2.19×106 m/s. The time period of the orbit can be calculated using the formula for centripetal acceleration:

a = v^2/r

F = ma = (mv^2)/r

F = kQq/r^2

mv^2/r = kQq/r^2

T = 2pir/v

where F is the electrostatic force between the electron and the proton in the nucleus, k is Coulomb's constant, Q is the charge of the nucleus, q is the charge of the electron, m is the mass of the electron, and r is the radius of the orbit.

Substituting the given values, we get:

T = 2pi(5.29×10^(-11) m)/(2.19×10^6 m/s) = 2.42×10^(-16) s

Using the charge of an electron, q = -1.6×10^(-19) C, and the velocity calculated above, we get:

I = qv/T = (-1.6×10^(-19) C)(2.19×10^6 m/s)/(2.42×10^(-16) s) = -6.63×10^(-7) A

The negative sign indicates that the effective current is in the opposite direction of the electron's motion.

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The time constant of the coil is approximately 6.288s, the resistance of the coil is 40Ω, and the current after 0.5s is 22.4mA.

(i) To determine the time constant (τ) of the coil, we'll use the formula,

τ = (t1 - t2) / (ln(I1 / I2))

where t1 = 0.2s, I1 = 50mA (0.05A), t2 = 10s, and I2 = 0.3A.

τ = (0.2 - 10) / (ln(0.05 / 0.3)) = -9.8 / (ln(1/6)) ≈ 6.288s

(ii) To determine the resistance (R) of the coil, we'll use the formula,

R = V / I = 12V / 0.3A

R = 40Ω

(iii) To determine the current (I) after 0.5s, we'll use the formula,

I(t) = V/R * (1 - e^(-t/τ))

where V = 12V, R = 40Ω, t = 0.5s, and τ = 6.288s.

I(0.5) = (12 / 40) * (1 - e^(-0.5 / 6.288)) ≈ 0.3 * (1 - e^(-0.0795)) ≈ 0.0224A or 22.4mA

In conclusion, the coil's time constant is roughly 6.288 seconds, its resistance is 40 ohms, and its current after 0.5 seconds is 22.4 mA.

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The time constant of the coil is approximately 6.288s, the resistance of the coil is 40Ω, and the current after 0.5s is 22.4mA.

(i) To determine the time constant (τ) of the coil, we'll use the formula,

τ = (t1 - t2) / (ln(I1 / I2))

where t1 = 0.2s, I1 = 50mA (0.05A), t2 = 10s, and I2 = 0.3A.

τ = (0.2 - 10) / (ln(0.05 / 0.3)) = -9.8 / (ln(1/6)) ≈ 6.288s

(ii) To determine the resistance (R) of the coil, we'll use the formula,

R = V / I = 12V / 0.3A

R = 40Ω

(iii) To determine the current (I) after 0.5s, we'll use the formula,

I(t) = V/R * (1 - e^(-t/τ))

where V = 12V, R = 40Ω, t = 0.5s, and τ = 6.288s.

I(0.5) = (12 / 40) * (1 - e^(-0.5 / 6.288)) ≈ 0.3 * (1 - e^(-0.0795)) ≈ 0.0224A or 22.4mA

In conclusion, the coil's time constant is roughly 6.288 seconds, its resistance is 40 ohms, and its current after 0.5 seconds is 22.4 mA.

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Answer:

Periods are horizontal rows (across) the periodic table, while groups are vertical columns (down) the table. Atomic number increases as you move down a group or across a period. Beside above, what do columns mean in the periodic table? The periodic table also has a special name for its vertical columns.

Explanation:

Answer:

A. True

Explanation:

edge 2022

The blue, hotter stars tend to have shorter lifetimes than the , cooler stars; this is a true fact as the lifespan of a star is determined by its mass. Blue, hotter stars have higher masses than red, cooler stars.

The lifespan of a star is largely determined by its mass because a star's mass affects its internal pressure, temperature, and nuclear fusion rate, and more massive stars have stronger gravitational forces, which lead to higher pressures and temperatures in their cores. The rate of nuclear fusion reactions in a star determines how quickly it consumes its fuel, which in turn affects the lifespan of the star. Blue, hotter stars have a higher rate of nuclear fusion reactions and consume their fuel much more quickly than red, cooler stars.

Hence, the blue, hotter stars tend to have shorter lifetimes than the redder, cooler stars.

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If a toy rocket is launched vertically and rises to a height of 250 meters, then the initial velocity of the toy rocket would be 70 m / s.

There are three equations of motion given by Newton,

v = u + at

S = ut + 1/2×a×t²

v² - u² = 2×a×s

As given in the problem, a toy rocket is launched vertically and rises to a height of 250 meters, we have to find the initial velocity of the launch,

By using the third equation of motion given by Newton,

v² - u² = 2×a×s

0² - u² = 2×(-9.81)×250

u² = 4905

u = 70 m / s

Thus, the initial velocity of the toy rocket would be 70 m / s.

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I found the answer sheet online for you

Answer:

The time is identical, since both pulses travel at the speed of light.

Explanation:

Answer:

\(0.361\ \text{m}\)

Explanation:

\(f_s\) = Frequency of source = 375 Hz

\(\Delta f\) = Difference between the maximum and minimum sound frequencies = 2.75 Hz

v = Speed of sound in air = 343 m/s

T = Time period = 1.8 s

\(v_m\) = Maximum speed of the microphone

We have the relation

\(\Delta f=2f_s\dfrac{v_m}{v}\\\Rightarrow v_m=\dfrac{\Delta fv}{2f_s}\\\Rightarrow v_m=\dfrac{2.75\times 343}{2\times 375}\\\Rightarrow v_m=1.26\ \text{m/s}\)

Amplitude is given by

\(A=\dfrac{v_mT}{2\pi}\\\Rightarrow A=\dfrac{1.26\times 1.8}{2\pi}\\\Rightarrow A=0.361\ \text{m}\)

The amplitude of the simple harmonic motion is \(0.361\ \text{m}\).

When the average velocity is 2.4 m/s, the horizontal 0.35 meter diameter cast iron water pipe experiences a pressure drop (P) of roughly 16457.14 kPa every 100 meters.

To determine the pressure drop per 100-meter length of a horizontal 0.35-meter diameter cast iron water pipe, we can use the Darcy-Weisbach equation. The equation is as follows:

\(\begin{equation}\Delta P = \frac{f \cdot \frac{L}{D} \cdot (\rho \cdot V^2)}{2}\)

where ΔP is the pressure drop, f is the Darcy friction factor, L is the length of the pipe (100 meters in this case), D is the diameter of the pipe (0.35 meters), ρ is the density of water, and V is the average velocity of water.

To calculate the pressure drop, we need to determine the Darcy friction factor. For a rough cast iron pipe, we can estimate the friction factor to be around 0.02.

Using the given values and the estimated friction factor, the calculation becomes:

\(\begin{equation}\Delta P = \frac{0.02 \cdot \frac{100}{0.35} \cdot (\rho \cdot 2.4^2)}{2}\)

Since the density of water (ρ) is approximately 1000 kg/m³, we can substitute this value and calculate the pressure drop:

ΔP = \(\frac{0.02 \times \frac{100}{0.35} \times 1000 \times 2.4^2}{2}\)

Let's solve the expression to calculate the pressure drop (ΔP) in kilopascals (kPa):

ΔP =  \(\frac{0.02 \times \frac{100}{0.35} \times 1000 \times 2.4^2}{2}\)

First, let's simplify the expression:

ΔP = \(\frac{0.02 \times (285.714) \times (1000 \times 5.76)}{2}\)

   = 16457.14

Therefore, the pressure drop (ΔP) per 100-meter length of the horizontal 0.35-meter diameter cast iron water pipe, when the average velocity is 2.4 m/s, is approximately 16457.14 kPa.

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Complete question :

Determine the pressure drop per 100 -m length of horizontal new 0.35−m-diameter cast iron water pipe when the average velocity 2.4 m/s. Δp= kPa

The refractive index of the material is 0.

When the ray is incident on a transparent surface at an angle of 360 and the angle of refraction within the material is 27°, the refractive index of the material can be determined. The formula for Snell’s law is used to calculate refractive index. It states that: `sin i / sin r = n where i is the angle of incidence, r is the angle of refraction and n is the refractive index`.Snell’s law can be re-arranged to make n the subject of the formula to be: `n = sin i / sin r`Hence, we can calculate the refractive index as follows:

For the incident ray, i = 360° and the angle of refraction within the material, r = 27°.n = sin i / sin r= sin 360°/ sin 27°= 0/1 (since sin 360° = 0)= 0Therefore, the refractive index of the material is 0. T

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We now think that the canals seen on Mars in the late nineteenth and early twentieth century were the result of optical illusions.

The canals of Mars, which appeared to be systems of long, straight lines on the surface of Mars, are now understood to be illusions caused by the unintentional alignment of craters and other natural surface features that are seen in telescopes close to their resolution limit. They sparked a lot of debate and influenced how people perceived the possibility of life beyond Earth in the late 19th and early 20th centuries.

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Electrical energy which is provided to the pump is transformed into gravitational potential energy and into sound in equal portions. Thus, the correct option is C.

The principle of conservation of energy establishes that the energy cannot be created nor it can be lost alone. Energy can only be transformed, based on the principle of conservation of energy, the mechanical energy of the system is established as formed by the kinetic energy and the different in potential energies.

In this case, the electrical energy of the system is transformed into kinetic energy to raise the water temperature, when it reaches a height level where its actual speed is zero, all the mechanical energy is transformed into gravitational potential energy.

Therefore, the correct option is C.

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Your question is incomplete, most probably the complete question is:

Ahmad uses an electric pump to raise water to a reservoir on his farm. The pump is very noisy, and Ahmad’s uncle, who is an engineer, told him that only 50\%50%50, percent of the energy it consumes is delivered as gravitational potential energy to the water. When Ahmad turns off the pump, he notices that when he touches it, it has not warmed up.

What happened to the electrical energy provided to the pump?

a. It mostly transformed into gravitational potential energy, and a small portion transformed into sound.

b. It mostly transformed into sound, and a small portion transformed into gravitational potential energy.

c. It transformed into gravitational potential energy and into sound in equal portions.

d. It mostly transformed into sound energy and gravitational potential energy, and a small portion disappeared.

Answer:

105

Explanation:

Trust brother

Answer:

Therefore, the magnitude of the acceleration of the particle at the instant when its velocity is zero is approximately 18.258 m/s².

Explanation:

To find the magnitude of acceleration at the instant when velocity is zero, we need to differentiate the given velocity equation with respect to time (t) to obtain the acceleration equation.

Given:

Velocity equation: v(t) = 22 - 3.8t^2

Differentiating the velocity equation with respect to time, we get:

a(t) = d(v(t))/dt = -2 * 3.8t

To find the magnitude of acceleration at the instant when velocity is zero, we need to solve for t when v(t) = 0.

0 = 22 - 3.8t^2

3.8t^2 = 22

t^2 = 22/3.8

t^2 ≈ 5.789

Taking the square root of both sides, we find:

t ≈ √(5.789)

t ≈ 2.403

Now we can substitute this value of t into the acceleration equation to find the magnitude of acceleration at that instant:

a(t) = -2 * 3.8 * 2.403

a(t) ≈ -18.258

Therefore, the magnitude of the acceleration of the particle at the instant when its velocity is zero is approximately 18.258 m/s².

The load calculations for circuits supplying lighting units with ballasts are based upon the total wattage of the lighting units.

This includes both the wattage of the lamps and the ballasts. The ballast wattage is typically specified by the manufacturer and should be included in the calculations. It's important to consider the maximum wattage of the lamps and ballasts that will be connected to the circuit in order to determine the appropriate wire size and circuit breaker rating.

In general, the total wattage of the lighting units should not exceed the maximum load capacity of the circuit. This ensures safe and efficient operation. Remember to consult local electrical codes and regulations for specific requirements in your area.

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If you filled an airtight balloon at the top of a mountain and then descended, the balloon would decrease in size due to the increase in atmospheric pressure as you moved closer to sea level.

This is because air pressure is greater at lower altitudes, causing the balloon to compress as the outside air squeezes it. As you continue to descend, the balloon will continue to shrink until it reaches a point where the pressure inside the balloon equals the pressure outside, at which point it will stop compressing.

As you descend the mountain, atmospheric pressure increases due to a higher concentration of air molecules at lower elevations. This increased pressure would cause the gas inside the balloon to compress. As a result, the airtight balloon would decrease in size during your descent.

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Answer:

Essential processes happen in a cell: Onion plant and Diatom

A cell is its basic unit of structure: Onion plant and Diatom

Made up of one cell: Diatom

Made up of many cells: Onion plant

Answer:

50 kmph

Explanation:

300 / 6 = 50