If a black hole is "black, and dark" how can we see it in the dark, cold space?

Answer:

A stone that is dropped down into an empty well

Answer:

4.9 m/s²

Explanation:

Draw a free body diagram.  There are two forces on the object:

Weight force mg pulling straight down,

and normal force N pushing perpendicular to the plane.

Sum the forces in the parallel direction.

∑F = ma

mg sin θ = ma

a = g sin θ

a = (9.8 m/s²) (sin 30°)

a = 4.9 m/s²

8.27 x 1013 meres is the orbital radius.

Jupiter's mass, 1.9 x 1027 kg, and the time interval, 16.9 days, are equal to 1.46 x 106 seconds. The radius is needed, thus r. Solution

The moon must be held in its orbit by a gravitational force equal to the centripetal force between Jupiter and the moon.

6.67 x 10⁻¹¹ N/m²kg

2 x 1.9 x 10/27 x 1.46 x 10'6 / 4 r = 6.85 x 102'7 G = 6.67 x 10'11 N/m2kg2 r = 8.27 x 10'7

The second-largest moon in Jupiter's orbit and the third-largest moon in the solar system is called Callisto. Of all the objects in our solar system, its surface has the most craters.

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Answer:

A multicellular organism develops from a single cell called (the zygote)

Explanation:

This is because many different cell types, organized into tissues and organs. Development involves cell division, body axis formation, tissue and organ development, and cell differentiation

The magnitude of the force P provided that the stress in the part AB is two times that of BC part is 0.8 kN.

The magnitude of the force P provided that the stress in the part AB is two times that of BC part is calculated as follows;

Take moment about the joint to determine the magnitude of the force along part BC.

120 kN x 750 mm  =  F x 1000 mm

F = ( 120 kN x 750 mm ) / ( 1000 mm )

F = 90 kN

Stress is given as force divided by area. The following equation can be used to determine the magnitude of force P.

Stress in AB = 2 times stress in BC

P/A₁  = 2F/A₂

where;

A₁ =  πd²/4  =  π(50 x 10⁻³)²/4

A₁ = 1.96 x 10⁻⁵ m²

A₂ = πd²/4  =  π(75 x 10⁻³)²/4

A₂ = 4.42 x 10⁻³ m²

P/A₁ = 2F/A₂

P = (2F x A₁) / (A₂)

P = (2 x 90 kN x 1.96 x 10⁻⁵ m² ) / ( 4.42 x 10⁻³ m² )

P = (2 x 90,000 N x 1.96 x 10⁻⁵ m² ) / ( 4.42 x 10⁻³ m² )

P = 798.2 N

P = 0.798 kN

P ≈ 0.8 kN

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Answer:

Explanation:

Nothing happens unless we know the position relationship between launch ramp and landing slope. That missing figure would sure be helpful.

ASSUMING the landing slope starts its 45° slope at the position where the skier leaves the launch track. Also assuming no air resistance or lift due to airfoil action on body and skis. (projectile trajectory)

With the launch point as origin and original velocity in the positive direction, horizontal position can be described as

x = 28t

With the launch point as origin and DOWN being positive direction, vertical position can be described as

y = ½(9.8)t²

y = 4.9t²

On a 45° downward slope, y will increase at the same rate as x. time t is common to both equations. When our y equals our x, landing occurs.

4.9t² = 28t

4.9t = 28

t = 5.714285...s

t = 5.71 s

The horizontal and vertical distances at landing are

x = 28(5.714285) = 160 m

so along the slope, the distance is

d = √(2(160²)) = 226.2741699...

d = 226 m

velocities will give us the angle of flight, subtract the slope.

φ = arctan(gt/vx) - 45 = arctan(9.8(5.714285) / 28) - 45 = 18.434948...

φ = 18°

Answer:

Explanation:

The electric field inside of a conductor is 0 because the conduction electrons are pushed to the outer edges of the conductor. The surface of the conductor still has charge.

Answer: 0.25A

Explanation: To calculate the current in the circuit, we can use Ohm's Law, which states that the current (I) flowing through a circuit is equal to the voltage (V) divided by the resistance (R):

I = V / R

In this case, the total resistance of the circuit is the sum of the individual resistances of the three bulbs in series, which gives us:

R = 2 + 2 + 2 = 6 ohms

The voltage of the battery is given as 1.5V.

So, using Ohm's Law, we can calculate the current in the circuit as:

I = V / R = 1.5 / 6 = 0.25 amps

Therefore, the current in the circuit is 0.25 amps.

The current in the circuit is 0.25 A.

Voltage across the circuit, v = 1.5 V

Resistance in each resistors, R = 2Ω

Since, the resistors are connected in series combination, their effective resistance,

R' = 3R

R' = 3 x 2

R' = 6Ω

According to Ohm's law, if the temperature and all other physical factors remain constant, the voltage across a conductor is directly proportional to the current that is flowing through it.

So, according to Ohm's law,

V = IR

Therefore, current flowing through the given circuit,

I = V/R

I = 1.5/6
I = 0.25 A

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Based on the information provided, it is likely that the figure shows an alternating current (AC). The arrows under the electrons pointing right and left, both towards and away from the light bulb, indicate that the direction of the electron flow is changing periodically. This is a characteristic of alternating current, where the flow of electric charge reverses direction periodically, typically in a sinusoidal manner.

In an AC circuit, the voltage also changes direction periodically, which is consistent with the changing direction of the electron flow shown in the figure.

In an alternating current, the flow of electrons periodically reverses direction, causing the current to switch between positive and negative values. This is different from direct current (DC), where electrons flow in a single, constant direction.

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The acceleration of the object is  2.5 m/s^2

The idea that should be at the back of your mind when you hear the use of the term acceleration is the change in the velocity of the object with respect to the time.

In this case, we have to look at the graph that we have been given in the question. It is a graph of the velocity against the time and the slope of the graph is the acceleration of the motion that is under consideration.

a = 100 - 0/40 - 0

= 2.5 m/s^2

We have the acceleration as 2.5 m/s^2

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Answer:

C) The book's inertia carried it forward.

When the bus stops suddenly, the book tends to remain in motion due to its inertia. The book was at rest on the seat of the bus, and when the bus stopped suddenly, the book continued moving forward with the same speed and direction it had before the bus stopped. As a result, the book slid off the seat and onto the floor.

Answer:

gravity

Explanation:

I don't know what the explanations would be

Answer:

a four-sided plane rectilinear figure with opposite sides parallel.

Answer:

The magnitude of the resultant force of the two forces (40 N and 30 N) at right angles is 50 N.

Explanation:

The resultant of two forces at right angles to each other is found by using the Pythagorean theorem. The Pythagorean theorem states that in a right triangle, the square of the hypotenuse (the longest side, opposite the right angle) is equal to the sum of the squares of the other two sides (the two shorter sides).

In this case, the two forces form the two shorter sides of the triangle and the resultant force is the hypotenuse.

So the magnitude of the resultant force can be calculated as:

√(40^2 + 30^2) = √(1600 + 900) = √2500 = 50 N

The magnitude of the resultant force of the two forces (40 N and 30 N) at right angles is 50 N.

The calculated acceleration is \(10.0 km/s^2\)

Acceleration is a measure of how quickly an object changes its velocity. In physics, acceleration is defined as the rate of change of velocity with respect to time. It can be positive (meaning the object is speeding up), negative (meaning the object is slowing down), or zero (meaning the object is moving at a constant velocity). The units of acceleration are typically meters per second squared\((m/s^2)\)or kilometres per second squared\((km/s^2).\)

The initial velocity \((v0)\) and final velocity \((vf)\) of the particle and the time \((t)\) it takes for it to reach its final velocity have to be known. From this information,  equation of motion can be used  to calculate the acceleration \((a)\):

\(a = (vf - v0) / t\)

Since the initial velocity of the particle is 0 (at rest),  the equation can be simplified:

\(a = vf / t\)

Calculate the time t. The formula for average velocity (v_avg) to find the time:

v_avg = \((v0 + vf) / 2\)

v_avg = \(8,0 km/s / 2 = 4.0 km/s\)

The distance (d) the particle travels can be found from the average velocity and time:

d = v_avg * t

The distance (d) that the particle has to travel, which is 3.2 km, can be solve for t:

t = d / v_avg

\(t = 3.2 km / 4.0 km/s = 0.8 s\)

Finally,  the equation  that can be used is a = \(vf\) / t to calculate the acceleration:

\(a = 8.0 km/s / 0.8 s = 10.0 km/s^2\)

So the correct answer is option 3, which is \(10.0 km/s^2.\)

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Answer:

Storing it at a temperature greater than its Curie temperature will demagnetize it. The Curie temperature--named after the French scientist Pierre Curie--is the temperature at which magnets lose their permanent magnetism. ... Samarium cobalt, neodymium, and ceramic/ferrite magnets are brittle.

The given information is insufficient to determine the change in length of the object at 25°C using the metal scale graduated at 0°C.

To solve this problem, we need to consider the concept of linear expansion. Most materials, including metals, expand when heated and contract when cooled. The amount of expansion or contraction depends on the coefficient of linear expansion (α) of the material.

The formula for linear expansion is:

ΔL = α * L * ΔT

where ΔL is the change in length, α is the coefficient of linear expansion, L is the original length, and ΔT is the change in temperature.

Given:

Coefficient of linear expansion for the metal scale (α) = 18 × 10^(-4) °C^(-1) (assuming it's the same as the metal of the object)

Temperature difference (ΔT) = 25°C - 0°C = 25°C

Original length (L) = unknown

We are asked to find the change in length (ΔL) of the object when measured at 25°C compared to its measurement at 0°C. Let's assume the object's original length at 0°C is L0.

ΔL = α * L * ΔT

ΔL = 18 × 10^(-4) °C^(-1) * L0 * 25°C

However, the given information is incomplete. The specific value of L0 or any other details about the object are not provided. Without knowing the original length of the object or any other relevant information, it is not possible to calculate the change in length or answer the question accurately.

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The CMB radiation's current temperature of 2.7 Kelvin is a result of the cooling and redshifting caused by the expansion of the Universe, which has been slowing down over time due to gravity.

The Cosmic Microwave Background (CMB) radiation is a remnant of the early hot and dense Universe. About 380,000 years after the Big Bang, the Universe cooled enough to allow the formation of neutral atoms, which made it transparent to radiation. This released the CMB radiation, which has been traveling through the Universe ever since, and its temperature has been cooling due to the expansion of the Universe. The CMB radiation is currently observed at a temperature of about 2.7 Kelvin, much cooler than the early Universe's temperature of 3000 Kelvin. This cooling is due to the expansion of the Universe, which causes the radiation to redshift to lower energies and longer wavelengths. This effect is known as the cosmological redshift. Moreover, the expansion of the Universe is not constant, but rather it is slowing down due to the gravitational pull of matter. This means that the early Universe's rate of expansion was faster than it is today, causing the CMB radiation to cool more rapidly in the past.

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Answer:

(a) r = 328 m

(b) F = 6271.8 N

Explanation:

speed, v = 540 km/h = 150 m/s

Acceleration, a = 7 g

(a) Let the radius is r.

\(a =\frac{v^{2}}{r}\\7\times 9.8 = \frac{150\times 150}{r}\\r = 328 m\)

(b) The force on 80 kg pilot at the lowest point is

\(F =m \times g + m\frac{v^{2}}{r}\\F = 80\times9.8 +80\times \frac{150\times 150}{328}\\\\F =784 + 5487.8 = 6271.8 N\)

The answer is  "frequency of radio station that transmits a radio wave with half the wavelength of the 720 kHz radio station is 1440 kHz".

The frequency (f) and wavelength (λ) of a radio wave are related by the equation: c = f λ

Where, c is the speed of light (approximately 3.00 x \(10^8\) m/s) in vacuum.

As for the first radio station, \(f_{1}\) = 720 kHz.

the wavelength \(\lambda_{1}\) of its radio waves can be calculated by using the above equation, i.e.

c = \(f_{1}\)\(\lambda_{1}\)

\(\lambda_{1}\) = c / \(f_{1}\)

   = (3.00 x \(10^8\) m/s) / (720 x \(10^3\) Hz)

\(\lambda_{1}\)= 416.67 m

And for the second radio station, as given, its radio waves have half the wavelength of the first radio station. So, the wavelength \(\lambda_{2}\) of its radio waves is \(\lambda_{1}\)/2 = 208.33 m.

We can find the frequency \(f_{2}\) of the second radio station using the same equation:

c = \(f_{2}\).\(\lambda_{2}\)

\(f_{2}\) = c / \(\lambda_{2}\)

    = (3.00 x \(10^8\) m/s) / (208.33 m)

\(f_{2}\) = 1440 kHz

Therefore, frequency of radio station that transmits a radio wave with half the wavelength of the 720 kHz radio station is 1440 kHz.

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Answer:

The correct answer is A. 8.0. In 2011, no fertiziler was added to the soil so the pH was not affected.

Answer:

a force

Explanation:

a force causes a certain object to move and make a displacement.

Answer:

A force must be applied.

With out force there is no movement that causes friction. Gravity is a force but doesn't affect all movement.

Answer:

the scientific study of natural forces such as light, sound, heat, electricity, pressure, etc.

Explanation:

mark as brainliest

Answer:

An ohmic conductor is defined as one which obeys ohm's law that is V ∝ I where is the voltage and is the current. There must be a linear graph. Silver is an example of an ohmic conductor as the graph for silver is a linear graph. Silver and copper are some examples of ohmic conductor

Answer:

3 820 885 N

Explanation:

Gravitational equation

   F = G  m1 m2 / r^2    

         G = gravitational constant = 6.6713 x 10^-11 m^3/kg-s^2

F = 6.6713 x 10^-11   *   4.41 x 10^5  * 5.97 x 10^24  / ( 6.78x 10^6)^2

 = 3820885 .3 N

Answer:

It is D

Explanation:

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