Two stars have the same luminosity, but one appears 100 times fainter in the night sky. How much farther away is the fainter star?A. 1000 times farther B.100 times farther C.10 times farther D.4 times farther E. 2 times farther

This is because light travels in a straight line, so only the students sitting directly in line with the light beam would be able to see it. When the flashlight is shone on the wall, the light reflects off the wall and spreads out, so everyone in the room is able to see the spot of light.

Light beam is a type of electromagnetic radiation that travels in a straight line. It is composed of tiny particles called photons, which carry energy and move at the speed of light. Light beams can be generated from sources such as the sun, flashlights, lasers, and other light-emitting devices. Light beams typically have a narrow diameter and can be focused in a specific direction to create very intense light. Light beams can also be used to transmit information, such as in fiber-optic cables. Light beams are used in a variety of applications, including photography, astronomy, communications, and medicine.

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An object of mass m is at rest at the origin at time t = 0. After 2 s, the velocity of the object in m/s will be 8a/3m.

Given that, F(t) = a t² ---(1)

We know that, F(t) = m a(t)

m a(t) can also be written as m dv/dt

m a(t) = m dv/dt ---(2)

(as we know, acceleration is the rate of change of velocity)

Equating (1) and (2), we have,

m dv/dt = a t²

m dv = a t² dt

dv = a/m t² dt

Integrating on both sides, we have,

∫ dv = a/m ∫ t² dt

v = a/m (t³/3)

At t = 2 s, we have velocity v as v = a/m (8/3) = 8a/3m

Thus, the required velocity of the object of mass m after 2 s is calculated to be 8a/3m.

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For weightless object, gravity is equal to centripetal acceleration. The radius of the loop is calculated as 8 km.

The property of the motion of an object traversing a circular path is known as centripetal acceleration. Any object that is moving in circle and has an acceleration vector pointed towards center of that circle is Centripetal acceleration.

As Centripetal Acceleration formula is;

a = v²/r

Given, V-  velocity =  280 m/s

And we know that for weightless object,

Gravity =  centripetal acceleration

So, a =  g

given, g =9.8 m/s²

So,9.8 = 280²/r

r= 8000 m

Radius of the loop = 8 km

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Answer: Sun

Explanation:

Pretty sure it's the sun because the others can't generate electrical energy

The moment caused by the 2 kg mass placed at a distance of 0.5 m to the left of the pivot is 1 kg m. This moment is anticlockwise.

Moment is a physical parameter equal to the product of the distance or displacement and another physical quantity such as mass, force etc.

For a mass of 2 kg and distance of 0.5 m the moment is  :

moment = mass × distance

= 2 × 0.5 = 1 kg m

If we are taking the moment of force, then it the product of the distance and force acting on the body is taken.

force = mg

F =  2 kg × 9.8 m/s² = 19.6 N

then moment of force = 19.6 N × 0.5 m = 9.8 N

The moment from left to right in direction is anticlockwise.

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The outer diameter of a hollow steel tube when the stress is limited to 120 MN/m² is  119.35 mm

Axial stress refers to the stress induced in a loaded member along the longitudinal or axial member direction. Calculated mathematically from the ratio of the axial or longitudinal force to the cross-sectional area of ​​the member.

Using the expressions for the axial stress and rated load, the cross-sectional area of ​​the tube can be determined. Substituting the values ​​for the cross-sectional area of ​​the tube and the inside diameter of the tube in the expression for the cross-sectional area of ​​a hollow cylinder yields the outside diameter of the tube.

                                σ = F/A

The formula for calculating the cross-sectional area of ​​a hollow cylinder.

A = π/4(D² – d²)

Here, the inside and outside diameters of a hollow cylinder are d and D.

Step 1

Determine the cross-sectional area of ​​tube (A) using the axial stress expression:

σ = F/A

Here, the axial stress limit is σ = 120 MN/m2 and the tensile load is F = 400 kN

σ = F/A

120 x 10³KN/1 MN = 400 kN/A

A = (400 kN) ÷ (120 x 10³ kN/m²)

A = 3333.33 mm²

Substitute the values ​​for the cross-sectional area of ​​the cylinder and the inside diameter of the cylinder in the equation for the cross-sectional area of ​​the hollow cylinder to calculate the outside diameter of the cylinder.

A = 3333.33 mm²

d = 100 mm

A = π/4(D² – d²)

3333.33 mm² = π/4(D² – 100²)

D² =[tex]\sqrt{ 14244.128}[/tex]

D = 119.35 mm

So, the outside diameter of the hollow is 119.35 mm.

Complete the questions is:

A hollow steel tube with an inside diameter of 100 millimeters must carry a tensile load of 400 kN. What is the outside diameter of the tube if the stress is limited to 120 MN/m²?

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According to the data given in the question the net force on the box is of 5 N.

All of the forces that are applied to an object are added up to form the net force. As a consequence of the fact that it (force) is a vector and therefore that two forces with identical magnitudes and opposing directions cancel each other out, the resultant force is the total of the forces, or put another way, the net force is just the total of all the forces.

Given data :

Force on box to the left side (F1) = 15 N

Force on box to the right side (F2) = 20 N

Because both forces are in opposite direction

Hence,

Net force = F2 - F1

Net force = 20 - 15

Net force = 5 N.

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Ethan is 1. 85 meters tall. At 10 a. M. , he measures the length of a tree's shadow to be 28. 45 meters. He stands 24. 3 meters away from the tree, so that the tip of his shadow meets the tip of the tree's shadow.  the height of the tree to the nearest hundredth of a meter is 12.68  meters

As a result, using the definition of proportion,

Tree: ethan = ethan shadow: Tree shadow

If you replace all the values, you get;

x / 1.85 = 28.45 / (28.45 - 24.3)

x / 1.85 = 28.45 / 4.15

x = 1.85*28.45 / 4.15

x = 12.68 m (rounded)

Consequently, the tree's height will be;

12.68  meters

Your question is incomplete but most probably your full question attached below

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Answer:

The speed of a wave is given by the equation:

Speed = Frequency x Wavelength

Given that the frequency of the wave is 5 Hz and the wavelength is 0.75 m, we can substitute these values into the equation:

Speed = 5 Hz x 0.75 m

Speed = 3.75 m/s

Therefore, the speed of the wave generated on the slinky is 3.75 m/s.

It's important to note that the speed of a wave depends on the properties of the medium through which it travels and not on the properties of the source of the wave.

Answer:

  The speed is  3.75

Explanation:

The relationship between wavelength and frequency is described by this simple equation:

                            λ = v/f

wave length (T) = 0.75m

frequency (f) = 5Hz

                      0.75 = v / 5

                       0.75*5 = v

                      v=3.75

A device that uses electrical energy as it interferes with the flow of charge is a  Reactor. Hence, option (C) is correct.

Reactance is the resistance to current flow in an AC circuit. A coil connected in series between two points in a power system is referred to as a reactor, also known as a line reactor, in order to reduce inrush current, voltage notching effects, and voltage spikes.

To adjust for a change in the load that the motor is starting, reactors can be tapped to vary the voltage across them. Ohms of impedance at a specific frequency and current are used to rate reactors.

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Answer:

a

true

true

true

true

true

true

true

The resistance would increase when the charge density increases.

We have to note that when we talk about the resistance, we mean the opposition that is offered to the flow of current in the circuit. Let it be known that the resistance would be seen to increase as the charge density is increasing. The reason why this is going to occur is that we are going to have a lot of charges that are migrating at the same time and as such the rate of the movement of the charges or their speed would be slowed down.

If on the other hand, we see that the charge density is low, we are going to have less charges and they are going to move more freely and the resistance or the opposition to the movement of the charges would be lower.

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The BEST description of the effect that her body distortion is having is (C) depression.

Depression is a mental health disorder characterized by a persistent feeling of sadness, hopelessness, and loss of interest in activities. People with depression may experience changes in sleep, appetite, energy level, and concentration. Additionally, they may experience feelings of guilt, worthlessness, and helplessness. Symptoms of depression can range from mild to severe and can include physical symptoms such as fatigue, headaches, and stomachaches. Psychotherapy, medication, and dietary changes were available treatments for depression. With the right support and treatment, individuals can lead a healthy and fulfilling life.

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The Hypothesis of Gregor Mendel are:

Mendel's work with his signature peas led to the description of the rules of heredity and the invention of the phrases dominant, recessive, and discrete factor (Orel 1984), which predated the concept of gene (Pisum sativum).

Working with pea plants, Gregor Mendel uncovered the rules of heredity. He reasoned that genes must exist in pairs since each child receives a set of DNA from both parents. Mendel observed how qualities from both parents may show up in offspring, and how they would be passed down as either dominant or recessive.

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Answer:

An eclipse of the sun must occur at a "new" moon - when the moon is between the earth and the sun.

The word penumbra refers to a "partial" eclipse as opposed to umbra which refers to total eclipse.

A partial eclipse must include both terms - "new" and "penumbra"

If you throw rocks more frequently into a lake, the waves will become more frequent and closer together. This is because throwing the rocks more frequently increases the rate of disturbance in the water, leading to more waves being created.

As you throw rocks more frequently into the lake, the water molecules in the lake will be disturbed more often and at a faster rate.

These disturbances create waves on the surface of the water, which are essentially the transfer of energy through the water molecules. When the rocks are thrown more frequently, more energy is added to the lake at a faster rate, which results in more waves being created.

Due to the above, the distance between the waves will decrease and the amplitude of the waves will likely be the same. This is due to the fact that the rate of disturbance is increased and therefore more energy is added to the system and the waves are created more frequently.

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The force on the glove is 12.8 N.

Solving for the  force on the glove:

The force on the glove is equal to the impulse (change in momentum) experienced by the ball divided by the time over which the force was applied.

Impulse = force x time

              = 5.0 N x (1/8.0 m/s)

Impulse = 0.625 Ns

The change in momentum of the ball ΔP is

ΔP =  m x v

where,

m = is  the mass of the ball

v= its velocity

Momentum = mass x velocity

                   = 0.2 kg x 8.0 m/s

Momentum= 1.6 kg m/s

The force on the glove is equal to the change in momentum divided by the time over which the force was applied:

Force = change in momentum/time

           = 1.6 kg m/s

               (1/8.0 m/s)

Force = 12.8 N

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As the atomic number of group 15 elements increases, the first ionization energy drops/decrease. (option 1).

The energy needed to remove one electron from an atom is known as the ionization energy.

The members of the group 15 are N, P, As, Sb, Bi, and Mc.

The initial ionization energy is the force required to expel an electron from a neutral atom in the gaseous state. The general electron configuration for the valence shell of the elements in group 15 is ns² np³, where n is the primary quantum number (the same number of the row in which the element is).

As you move lower in the group, n rises, the valence electrons are farther from the nucleus, which means that their attraction to the nucleus is diminished. As a result, as you move down in the group, the electrons will be more readily removed, requiring less energy to do so.

This enables you to forecast the following arrangement in the initial ionization energies:

N > P > As > Sb > Bi > Mc

The question is incomplete, it should be:

As the first five elements in group 15 are considered in order of increasing atomic number, first ionization energy

(1) decreases

(2) increases

(3) decreases, then increases

(4) increases, then decreases

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Answer:

Explanation:

A:  Screws are a simple machine that make doing work easier.

Work = W = Fd

F = W/d

So by increasing distance (d), you decrease the amount Force needed to do the work.

By applying a small rotational force (circular direction) on the screw, the axial force is amplified.  It takes less force to turn a screw around than to drive a nail straight into the wall.

B:  To make the job even easier, choose a screw with a "finer" thread.  The smaller the pitch (the distance between the screw's threads), the greater the mechanical advantage (the ratio of output to input force).  

Part A: The screw makes the student's work easier by providing a force that is directed downwards into the wall, allowing the student to secure the picture frame in place with a relatively small distance of travel.

Force is a physical quantity that is defined as the product of mass and acceleration. It is a vector quantity, meaning it has both magnitude and direction. Force is one of the fundamental concepts of physics and is responsible for the motion of objects. It is also responsible for the interaction between objects, such as the force of gravity that keeps the planets in orbit around the sun. Force can be applied to objects in order to cause them to move, accelerate, decelerate, or change direction. Force can also be used to do work, such as lifting a weight or pushing a car. Force is an important concept in physics and is used to explain many phenomena in the natural world.

Part B: A change to the screw design that would make the student's work even easier would be to use a self-tapping screw, which has a sharp point that allows it to cut its own thread into the wall, eliminating the need to pre-drill a hole. This would reduce the amount of effort required to secure the picture frame to the wall.

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Answer:

is d

Explanation:

Energy floating hands with a constant chill. growing desire to resist the Führer Only after he had a difficult time recovering from his push-ups.

steaming water Heat from the flame travels into the saucepan when the water boils, warming the liquid at the bottom of the pan. As the hot water rises as well as the cooled water falls to replace it, a passed through ( transmitted is produced.

Thermal energy is transferred from heated to cool places by convection. Convection is the process by which warmer portions of a gas or liquid move toward cooler areas of the same liquid or gas. Then, cooler liquid or gas replaces the heated portions that have ascended higher.

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Answer: Cosmology

Explanation:

The energy transformed from the water in the kettle to the surrounding water loses 4200 J/kg °C * 0.5 kg = 2100 J/°C.

As it's lost 46,200 J in total (regardless of the time it took for this to happen), it must have reduced in temperature by 22 degrees. Assuming 100°C initially, temperature of water in kettle is now 78°C.

The purpose of this experiment is to determine the specific heat of two metal blocks. In one of these measurements you will also investigate the use of Newton's Law of Cooling to calculate a cooling correction. The units of specific heat in SI are J / kg ˚C.

When a body of mass M at temperature T1  receives an amount of heat (or energy) Q, its temperature may increase from T1 to T2. The heat capacity C of a body is the amount of heat required to raise its temperature by one (Kelvin) degree.

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Answer:

To calculate the frictional force between the sled & block (stuck together) and the flat ground, we can use the equation:

friction = friction coefficient * normal force

The normal force is equal to the gravitational force acting on the combined mass of the sled and block, which is 12 kg + 8 kg = 20 kg. The gravitational force is equal to the mass multiplied by the acceleration due to gravity (g = 9.8 m/s^2).

So the normal force = 20 kg * 9.8 m/s^2 = 196 N

The coefficient of friction (µ) is given as 0.75. So the frictional force is:

friction = 0.75 * 196 N = 147 N

So the frictional force between the sled & block (stuck together) and the flat ground is 147 N.

Note that in calculating the normal force, we are assuming that the sled and block are moving as a single unit and therefore the force is acting on their combined mass. Also the force is calculated on the basis of friction coefficient which is given as 0.75

Answer:

Explanation:

The frictional force between the sled and block (stuck together) and the flat ground can be calculated using the formula:

friction = coefficient of friction * normal force

The normal force is the force exerted on an object perpendicular to the surface it is in contact with, and it can be calculated by using the weight of the object (mg). In this case, the weight of the sled and block (stuck together) is 12 kg + 8 kg = 20 kg. So, the normal force is 20 kg * 9.8 m/s^2 = 196 N.

Using the coefficient of friction provided (µ = .75), we can calculate the frictional force as:

friction = .75 * 196 N = 147 N.

So, the frictional force between the sled and block (stuck together) and the flat ground is 147 N.

The circumference over time and dependent on the object's distance from the axis of rotation is known as angular speed.

The angular speed of an object is the rate of change of angular distance with time. The angular speed of an object is measured in radian per second and it is scalar quantity.

Mathematically, the formula for the quantity that is determined by the circumference over time and dependent on the object's distance from the axis of rotation is given as;

ω = ( θ ) / ( t )

where;

The formula for angular speed in terms of circumference and time of motion is given as;

ω = ( 2πr ) / ( t )

Thus, the above can be called rotational speed because it depends on the object's distance from the axis of rotation.

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The planetesimals, which are small bodies that eventually formed into larger objects such as planets, are believed to have formed last in our solar system.

Our solar system formed around 4.6 billion years ago from a cloud of gas and dust, known as the solar nebula. The sun formed first from the dense, hot center of the nebula. As the sun formed, it began to emit heat and radiation, which caused the remaining gas and dust to begin to condense and form into small objects known as planetesimals.

As these planetesimals collided and merged, they grew larger and larger, eventually forming the inner planets, such as Mercury, Venus, Earth, and Mars. The outer planets, such as Jupiter and Saturn, also formed from the collision and merger of planetesimals, but they formed later in the process.

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Your question seems incomplete, but I assume the question was:

"Which object(s) formed last in our solar system?

the sun

the solar nebula

the inner planets

the planetesimals."

Answer:

c) 3

Explanation:

Answer:

c) 3

Explanation:

through process of elimination we can find the correct row

-Row 1 says blood cells, however the picture includes lungs so we eliminate that option

-Row 2 says absorption for the first image but once again that shouldn't include lungs

-Row 4 is very obvious that it is wrong because coordination has nothing to do with the intestines

which only leaves answer c

Answer:

1.Benefits of Renewable Energy Use

Less global warming.

Improved public health.

Inexhaustible energy.

Jobs and other economic benefits.

Stable energy prices.

2.Hydroelectric generation at scale dates back more than a century, and is still our largest renewable source – excluding traditional biomass, it still accounts for more than 60% of renewable generation

3.Biomass can be burned to create heat (direct), converted into electricity (direct), or processed into biofuel (indirect). Biomass can be burned by thermal conversion and used for energy