what makes astronomers think that cygnus x-1 contains a black hole? (a) we can directly observe that one member of the system emits no light. (b) the unseen object orbited by a luminous star is too massive to be a neutron star. (c) the strong x-ray emission from the system means it must contain a black hole.

Answer:

A.

Explanation:

momentum depends on weight and speed

Work = 222 cm x 2. The joule 444(J), sometimes known as the newton metre (N m), is the Si derived unit for work. The work required to move an item 2 metres with 1 N much force is measured in joules.

The work performed by a force from one newton acting via one metre is equivalent to one joule, a unit of work of energy in the Internacional System of Units (SI). Its name honours English physicist William Prescott Joule and its equivalent in ergs is 107, or around 0.7377 foot-pounds.

The work (or heat expended) by the a force with one newton (N) operating more than a distance of 1 m is equivalent to one joule (m). A force of one newton causes a mass of one kilogramme (kg) to accelerate by one m per second (s) every second. Thus, one joule is equivalent to one newton metre.

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To find the actual reading of the vernier caliper, you need to do the following:

Read the main scale: Read the main scale value that is to the left of the zero on the vernier scale. Record this value in millimeters.

Read the vernier scale: Look at the vernier scale and identify the line on the vernier scale that lines up exactly with a line on the main scale. Record the number on the vernier scale that lines up with the main scale line.

Add the two readings: Add the value you recorded from the main scale to the value you recorded from the vernier scale. This gives you the actual reading of the vernier caliper in millimeters.

For example, if the main scale reading is 20.0 mm and the vernier scale reading is 0.15 mm, the actual reading would be 20.15 mm.

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Answer:

These has anwers and also the solution. You can recheck if you want.

Answer:

D

Explanation:

im guessing here i hope it is correct and good luck

Answer:52.5

Explanation:

You pull a sled with a package on it across a snow-covered flat lawn. If you apply a force of 65.1 N to the sled, it accelerates at 1.24 m/s2. The combined mass of the package and the sled m = 52.50 kg

The given data to find Mass,

The force applied to the sled, F = 65.1 N

Acceleration of the sled, a = 1.24 m/s²

Forces are defined by both strength and direction.

Force is a vector quantity. It is a quantity that is described by Magnitude and Direction. The strength of a force is its magnitude and the direction, well it is the direction the magnitude is applied on the object.

We need to find the combined mass of the package and the sled. Let it is m. Using definition of force as follows :

F = ma

m = F/a

m = 65.1 /1.24

Mass, m = 52.5 Kg.

If you apply a force of 65.1 N to the sled, it accelerates at 1.24 m/s2. The combined mass of the package and the sled m = 52.50 kg

Hence, Option C is the correct answer.

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The two vectors with the largest magnitude when subtracted are A and F. Subtracting A from F will result in the largest difference in magnitude between two vectors.

In physics, a vector is a graphical or mathematical representation of a physical quantity that has both magnitude and direction. For instance, the vector position of a particle in space specifies its location relative to the origin.

The direction of a vector is indicated by an arrow pointing in the direction of the vector's motion. When two vectors are subtracted, the resulting vector is the vector that extends from the end of the vector being subtracted to the end of the vector it is being subtracted from.

If the two vectors have opposing directions, the resultant vector will be the difference between the magnitudes of the two vectors. Here are the vectors given: A -0.12i +0.22jB 0.28i +0.18jC -0.15i -0.14jD -0.05i +0.12jE 0.19i -0.1jF -0.08i -0.25j. To compute the vector magnitude of a vector, we use the formula: |V| = (V₁² + V₂²)¹/²Using this formula, we can compute the magnitudes of the vectors.  

Now, let's calculate the magnitudes of the given vectors: A = (0.12² + 0.22²)¹/² = 0.2488B = (0.28² + 0.18²)¹/² = 0.3246C = (0.15² + 0.14²)¹/² = 0.2108D = (0.05² + 0.12²)¹/² = 0.1312E = (0.19² + 0.1²)¹/² = 0.214F = (0.08² + 0.25²)¹/² = 0.266. Thus, the two vectors with the largest magnitudes will be: A and F.

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Answer:

The gradient of the graph is the mass of the object.

Explanation:

In a force-accleration graph, you are plotting force against acceleration. And from the formula for Force; F = ma

Make the mass subject of the formula; u'll get m = F/a. meaning that to get the mass of the object u have to find the gradient of the force-accleration graph.

Answer:

\(f = ma\)

Explanation:

where m is the inertial mass of the object. This equation indicates that a graph of acceleration vs force should be a straight line.

The maximum length of foil that can be made from 1.35 kg of foil is approximately 12487.51 cm.

We are given the width, thickness, and density of the foil, and we need to find the maximum length of foil that can be made from 1.35 kg. We can start by calculating the volume of the foil, then use that to find the length.

Convert mass to grams.
1.35 kg = 1350 g

Calculate the volume of the foil.
Volume = Mass / Density
Volume = 1350 g / 2.7 g/cm³
Volume ≈ 500 cm³

Convert width and thickness to centimeters.
Width = 308 mm = 30.8 cm
Thickness = 0.013 mm = 0.0013 cm

Calculate the cross-sectional area of the foil.
Area = Width × Thickness
Area = 30.8 cm × 0.0013 cm
Area ≈ 0.04004 cm²

Calculate the maximum length of the foil.
Length = Volume / Area
Length ≈ 500 cm³ / 0.04004 cm²
Length ≈ 12487.51 cm

Therefore, approximately 12487.51 cm is  the maximum length of foil that can be made from 1.35 kg of foil.

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Answer:

b

Explanation:

b) all energy remains in the system the surface is open which means this is false

Answer:

See below

Explanation:

See answer already posted HERE:
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Answer:

Doubling the large mass

Explanation:

Doubling the destance bewteen the masses will simply make the gravitational force weaker

same with every answer exce

Event will produce the greatest increase in the gravitational force between the two masses is Doubling the large mass.

A force is an effect that can alter an object's motion according to physics. An object with mass can change its velocity, or accelerate, as a result of a force. An obvious way to describe force is as a push or a pull. A force is a vector quantity since it has both magnitude and direction.

Gravitational force is directly proportional to product of mass and inversely proportional to product of distance between them. So, on increasing heaver mass greatest increase in the gravitational force.

Event will produce the greatest increase in the gravitational force between the two masses is Doubling the large mass.

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Answer:

C

Explanation:

Light with energy above a certain point can be used to knock electrons loose, freeing them from a solid metal surface, according to Scientific American.

photoelectric effect is the emission of electrons when electromagnetic radiation, such as light, hits a material

The event causes the formation of the electric current produced by the photoelectric effect is electrons are knocked off the surface that the light strikes by "particles" of light. Therefore, option C is correct.

The term photoelectric effect is defined as the emission of electrons when electromagnetic radiation, such as light, hits a material. An electrons emitted in this manner are called as photoelectrons.

The photoelectric phenomenon in which electrically charged particles are released within a material when it attracts electromagnetic radiation.

The event causes the formation of the electric current produced by the photoelectric effect is electrons are knocked off the surface that the light strikes by "particles" of light.

Thus, option C is correct.

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The frequency of the coil of f cross-sectional area of 300. 0 cm²is 7.1 Hz.

we are provided with several turns which is  200, a cross-sectional area which is 300 cm² (300 x 10⁻⁴ m²), and a magnetic field of 30 x 10⁻³ T.

The formula for calculating  the Maximum induced emf is

E = NBAω

where ω is angular velocity = 2πf, N is the number of turns, A is the cross-sectional area,  B is the magnetic field and E is the emf.

replacing  the value of w to 2πf in the above formula, we get

E = NBA2πf were f = frequency

=>f = E / (NBA2π)

=>f = 8 / (200 x 30 x 10⁻³ x 300 x 10⁻⁴ x 2 x 3.142)

=>f = 7.073 Hz

=>f = 7.1 Hz

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Velocity is the rate at which an object changes position.

___________________________________________

Velocity is a vector quantity that refers to "the rate at which an object changes its position."

Hope this helps!

Want to learn more? Visit below for more information about velocity.

Look up "Speed versus Velocity" at The Physics Classroom.com

The eyes, spinal cord, and brain are all main or key parts of the nervous system.

The minimum time it would take the man to lift forty 15.0 kg boxes to a height of 1.00 m with an average useful power output of 40.0 W is 147 seconds.

The work done in lifting one 15.0 kg box to a height of 1.00 m is given by:

W = mgh = (15.0 kg)(9.80 m/s²)(1.00 m) = 147 J

The work done in lifting forty boxes is:

W_total = (40 boxes)(147 J/box) = 5880 J

The time required to do this work is given by:

t = W_total/P = 5880 J/40.0 W = 147 s

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The electric field at point P(1m, 2m, -6m) due to a charge q=1 μC placed at point (1m, 2m, 4m) is zero.

To calculate the electric field at point P, we need to consider the contribution from the given charge q and any other charges that might be present. According to Coulomb's law, the electric field E at a point due to a point charge q is given by E = k × q / \(r^2\), where k is the electrostatic constant and r is the distance between the point charge and the point where the electric field is being calculated.

In this case, the distance between the charge q and point P is r = 10m (calculated as the magnitude of the vector from (1m, 2m, 4m) to (1m, 2m, -6m)). Plugging in the values, we have,\(E = (9 \times 10^9 N m^2/C^2) \times (1 \times 10^{-6} C) / (10m)^2 = 9 \times 10^3 N/C.\)

However, to find the total electric field at point P, we need to consider the superposition principle. If there are no other charges present, the electric field at point P will be solely due to the given charge q. The electric field vectors from each point in space cancel each other out, resulting in a net electric field of zero at point P. Therefore, the electric field at point P is zero.

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Answer:

135,000 m

Explanation:

(1500 m/s) (90 s) = 135,000 m

The distance travelled by sonar pulse will be 135,000 m. Distance is a numerical representation of the distance between two objects or locations.

The distance between two successive troughs or crests is known as the wavelength. The peak of the wave is the highest point, while the trough is the lowest.

The wavelength is also defined as the distance between two locations in a wave that have the same oscillation phase.

The length of a wave is measured in its propagation direction. The wavelength is measured in meters, centimeters, nanometers, and other units since it is a distance measurement.

The distance travelled by sonar pulse is found as;

\(\rm d = v \times t \\\\ \rm d = 1500\times 90 \\\\ \rm d = 135,000 \ m\)

Hence, the distance travelled by sonar pulse will be 135,000 m.

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Explanation:

mass=5 kg

potential energy=6000j

height=?

Now

potential energy =m.g.h

or 6000=5*9.8*h

or 6000=49h

or 6000÷49=h

or h= 122.45m

When an electron in a hydrogen atom jumps from n = 3 to n = 2, the frequency of the emitted electromagnetic radiation is approximately 19.65 x 10^7 H

To calculate the frequency of electromagnetic radiation emitted when an electron in a hydrogen atom jumps from energy level n = 3 to n = 2, you can use the Rydberg formula:

1/λ = R_H × (1/n_final^2 - 1/n_initial^2)

where λ is the wavelength of the radiation, R_H is the Rydberg constant for hydrogen (approximately 1.097 x 10^7 m^-1), and n_final and n_initial are the final and initial energy levels, respectively.

To find the frequency (f) of the radiation, you can use the equation:

f = c / λ

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

Given:

n_final = 2

n_initial = 3

Let's calculate the frequency:

Using the Rydberg formula:

1/λ = R_H × (1/n_final^2 - 1/n_initial^2)

1/λ = 1.097 x 10^7 m^-1 × (1/2^2 - 1/3^2)

1/λ = 1.097 x 10^7 m^-1 ×(1/4 - 1/9)

Calculating the result:

1/λ = 1.097 x 10^7 m^-1 × (9/36 - 4/36)

1/λ = 1.097 x 10^7 m^-1 × (5/36)

1/λ = 0.1526 x 10^7 m^-1

Now, let's calculate the frequency using the equation f = c / λ:

f = c / λ

f = (3.00 x 10^8 m/s) / (0.1526 x 10^7 m^-1)

f = 19.65 x 10^7 Hz

Therefore, when an electron in a hydrogen atom jumps from n = 3 to n = 2, the frequency of the emitted electromagnetic radiation is approximately 19.65 x 10^7 Hz.

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The satellite is 8.02 × 10⁵ m above Earth's surface.

Let H be the height above the surface of the Earth; since we know that the satellite is rotating around the Earth due to the gravitational pull of the planet, we may assert

Procedure to solve:

F = mv²/R+H

H = mv²/F - R

H = (1160 × 7446²/8955 - 6.38 × 10⁶)

M = 8.02 × 10⁵ m

About centripetal force:

The force applied to an item that is in velocity of  curved motion that is pointed toward the axis of rotation or the centre of curvature is known as a centripetal force.

The centripetal force formula is given as the product of mass (in kg) and tangential velocity (in meters per second) squared, divided by the radius (in meters) that implies that on doubling the tangential velocity, the centripetal force will be quadrupled. Mathematically it is written as:

F = mv²/r

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Answer:

8.02x 10^5 m

Explanation:

quiz

Answer:

There is a logical explanation for that.

Explanation:

Human activities such as lighting campfires and discarding lit cigarettes are responsible for starting fires, hotter weather makes forests drier and more susceptible to burning.

Rising temperatures, a key to climate change, evaporate moisture from the ground, drying out the soil, and making vegetation more flammable. At the same time, winter snowpacks are melting a month earlier, meaning forests are drier for longer periods.

As drought and rising heat continue with rising greenhouse gas emissions, there will be more expected wildfires in the years ahead, especially with the fire seasons getting longer.

The radius of Jupiter is 11.37 × 10^6 km (approx).

The correct answer to the given question is option D.

Jupiter is a giant planet in our solar system and takes 9.9259 hours to rotate on its axis. The tangential speed of Jupiter is given to be 12,293 m/s. We are required to find out the radius of Jupiter.

Given Data:

Rotation period of Jupiter, T = 9.9259 hours

Tangential speed of Jupiter, v = 12,293 m/s

Formula Used:

Radius of Jupiter, r = v × T / (2π)

Calculation:

We can find the radius of Jupiter using the above formula.

Substituting the given values in the formula, we get:

r = 12,293 × 9.9259 × 60 × 60 / (2π)r = 71,492,602.68 / (2π)r = 11,371,641.26 km ≈ 11.37 × 10^6 km.

Therefore, the radius of Jupiter is 11.37 × 10^6 km (approx).

Hence, the correct option is 69,912 km.

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Answer:(x-32) * 5/9

Explanation:

(52°F − 32) × 5/9 = 11.1111°C