The gravitational force between two bodies varies inversely as the square of the distance between them. If the force between two bodies is 18 N when the distance between them is 10 km, find the fource between the bodies when the distance between them is 7.5 km.

a) Mirrors

Mirror requires the high luster of metals in order to work.

When light shine on to the surface of a metal, its electrons absorb small amounts of energy and become excited into one of its many empty orbitals.

The electrons immediately fall back down to lower energy levels and emit light.

This process is responsible for the high luster of metals.

Here,

Mirrors have metal coating on its back side, because of high reflective property , high lustrous mirror is preferred . When metal is more lustrous, the less light reflect into it and bounces back.

Coating one side of a piece of glass with shiny metals can turn it into a mirror, reflecting light coming toward it.

Window glass can reflect only eight percent of light hitting it, while mirrors can reflect 95 percent of light hitting them.

The glass in a mirror is usually coated with a layer of silver or aluminum.

Mirrors are shiny because when photons (rays of light) coming from an object , it strike the smooth surface of a mirror, then they bounce back at the same angle. Our eyes see these reflected photons as a mirror image.

Therefore,

Mirror requires the high luster of metals in order to work.

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Answer:A) mirrors

Explanation:

Biomass energy refers to energy that is derived from organic matter, such as wood, crop residues, and even municipal solid waste. This organic matter can be replenished through biogeochemical cycles.

Organic products, such as fruits, vegetables, meat, and dairy, are grown or raised without the use of synthetic chemicals, fertilizers, or hormones. Organic certification is granted by regulatory bodies that ensure that the products meet strict organic standards.

In addition to its benefits for the environment and personal health, organic farming and food production also promote animal welfare and sustainable agriculture practices. However, organic products may be more expensive than conventionally grown products due to the increased cost of production and certification.

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If speed is 39 m/s and neglect drag, Maximum height of cannonball is 156m, rise time is 4s, and total flight time is 7.86 seconds.

Given that a student fires a cannonball vertically upwards with a speed of 39 m/s, and neglecting drag and initial height and horizontal motion of the cannonball, we can determine all unknowns as follows:

Maximum height: The maximum height of the cannonball can be determined using the equation for vertical motion under constant acceleration, which is:

h =\(vi * t - (1/2) * g * t^2,\)

where h: height

vi: initial velocity

t: time

g: acceleration due to gravity (9.8 m/s^2).

As maximum height occurs when the velocity is 0, we can set vi = 39 m/s, and t = (2 * vi) / g, to find that

h = \(39 m/s * t - (1/2) * 9.8 m/s^2 * t^2 = (39 * t) / 2.\)

\((39 * t) / 2 = (39 * (2 * vi) / g) / 2 = (39 * 2 * 39) / (2 * 9.8) = 78 * 39 / 19.6 = 78 * 2 = 156 m.\)

Rise time: The time it takes for the cannonball to rise to its maximum height can be determined using the above equation for maximum height. Plugging in h = (39 * t) / 2, and solving for t, we find that t = (2 * h) / 39.

The rise time is \((2 * h) / 39 = (2 * 156) / 39 = 4 s\)

Total flight time: The total flight time of the cannonball can be determined using the equation for vertical motion under constant acceleration, which is h = \(vi * t - (1/2) * g * t^2\). We know the initial velocity, vi = 39 m/s, and we can set h = 0 (since the cannonball lands back on the ground), to find that t = (2 * vi) / g.

total flight time is \((2 * vi) / g = (2 * 39) / 9.8 = 7.86 s.\)

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Answer:

a) 13.7 m

b) 8.3 m

Explanation:

a)

       \(d = d_{1} + d_{2} = 11.0 m + 2.7 m = 13.7 m (1)\)

b)

       \(x_{o} = 0 (2)\)

       \(x_{f} = x_{1} - x_{2} = 11.0 m - 2.7 m = 8.3 m (3)\)

      ⇒ Δx = xf - x₀ = 8.3 m  - 0 m =  8.3 m

A

Explanation:

Groups and Periods.

Point B on the standing wave is referred to as a node. The correct option is B.

In a standing wave, a node refers to a point or region of minimal or zero amplitude. It is a point where the displacement of the wave is always zero, and it remains stationary as the wave oscillates. At a node, the particles or elements that make up the medium through which the wave is propagating do not experience any displacement from their equilibrium positions.

Nodes occur due to destructive interference between two waves of equal frequency and amplitude traveling in opposite directions. The superposition of these waves results in the formation of a standing wave pattern, characterized by nodes and antinodes.

Nodes are important features of standing waves and have several properties:

Fixed position: Nodes maintain a fixed location within the standing wave pattern and do not move as the wave oscillates.

Zero displacements: At nodes, the amplitude of the wave is zero, and there is no displacement of the medium particles or elements.

Energy concentration: Nodes are regions of low energy in a standing wave. The energy of the wave is primarily concentrated in the regions between the nodes, known as antinodes.

Separation distance: The distance between adjacent nodes in a standing wave is equal to half the wavelength of the wave.

Therefore, The correct answer is option B.

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Answer:

rod end A is strongly attracted towards the balls

rod end B is weakly repelled by the ball as it is at a greater distance

Explanation:

When the ball with a negative charge approaches the A end of the neutral bar, the charge of the same sign will repel and as they move they move to the left end, leaving the rod with a positive charge at the A end and a negative charge of equal value at end B.

Therefore rod end A is strongly attracted towards the balls and

rod end B is weakly repelled by the ball as it is at a greater distance

the radius is 231

Explanation:

The article "Sunrise, Sunset...or Not?" by ReadWorks has a more formal tone compared to "The Ever-Changing Sky" by Megan McGibney.

In "Sunrise, Sunset...or Not?" the author uses scientific and technical terms such as "counterclockwise," "Arctic Circle," and "phenomenon," and provides a detailed explanation of the scientific reasoning behind the rising and setting of the sun.

In contrast, "The Ever-Changing Sky" by Megan McGibney has a more casual tone, using more colloquial language such as "clear day," "bright and shiny," and "People have always looked up at the sky with wonder." The author also uses phrases like "guess how long" and "right!" which implies that the author is addressing a less formal audience and is being conversational.

In all, "Sunrise, Sunset...or Not?" has a more formal tone because of its use of technical language, explanation of scientific concepts, and a generally informative and explanatory writing style.

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Sunrise, Sunset...or Not?

by ReadWorks

The sun is a wonderful thing for Earth. It is a star that heats the planet and makes life on

Earth possible. In addition, its light shines onto the planet. It is Earth's ultimate source of

energy.

Summer days may be longer than winter days, but for most people, the sun seems to do the

same thing each day: it appears to come up in the east for the day, and it appears to go down

in the west for the night. The sun looks like it rises in the east and sets in the west because of

how the earth spins in space. It spins toward the east, or counterclockwise. This means that

when most people look at the sky in the morning, the sun will first appear in the east.

The earth takes 24 hours to complete one turn. For most places on Earth, there is a daytime

and nighttime every 24 hours. But in some places for many days at a time, the sun might stay

up in the sky, or it might not even come up above the horizon.

In some parts of the world, the sun can be up in the sky for months. During part of the spring

and summer in Earth's Northern Hemisphere, the Northern Hemisphere is tilted towards the

sun so much that the sun in northern Alaska, which is located in the Arctic Circle, never goes

below the horizon. The Arctic Circle is an area at the top of the earth. In Barrow, Alaska, the

sun doesn't set for almost three months! This phenomenon is called the midnight sun, when

the sun has not set at midnight. Try sleeping through that!

During parts of the fall and winter in Earth's Northern Hemisphere, the Northern Hemisphere

is tilted in such a way that the sun doesn't come over the horizon in northern Alaska for a little

over two months. Therefore, nights last more than 24 hours. This phenomenon is called the

polar night. Although the sun never rises above the horizon during parts of the fall and winter

in the Arctic Circle, enough light often shines so that people who live there don't need

The Ever-Changing Sky

The Ever-Changing Sky

by Megan McGibney

Look up at the sky on a clear day. You will see the sun. It is bright and shiny, warming much of

what its light touches. Look up at the sky again at night. You may see the stars. They are also

bright and shiny, glimmering in the dark sky. You may also see the moon. It looks bright and

shiny, reflecting light from the sun. People have always looked up at the sky with wonder.

Some have even studied the sun, moon, and stars. These people, called astronomers, have

learned that those objects in the sky do not stay in the same place all the time.

The Ever-Changing Sky

extra quarter of a day.

Let's take a closer look at the moon. The earth does not revolve around the moon. Instead,

the moon revolves around the earth. It takes the moon about four weeks to complete a

revolution around the earth. The portion of the moon we, here on Earth, see changes over

this period of about four weeks as the moon's position around the earth changes. The

moonlight we see at night is the moon's reflection of sunlight onto Earth. The different ways

the moon appears to us are known as the moon's phases. The moon's phases depend on the

moon's position in relation to the earth and the sun.

The four-week period starts and ends with the new moon. The new moon cannot be seen

because the side of the moon lit by the sun is facing away from the earth.

Use the articles "The Ever-Changing Sky" and "Sunrise, Sunset...or Not?" to answer

questions 6.

6. Which article has a more formal tone? Support your answer with details from both texts.

Answers will vary.

Part (a)

Given data:

Mass of the automobile;

Velocity of the automobile;

Converting the velocity from km/h to m/s:

The kinetic energy of the automobile is given as,

Substituting all known values,

Therefore, kinetic energy of the automobile is 312500 J.

Part (b)

When the automobile is stoped, its velocity becomes 0 i.e. v'=0. Therefore, kinetic energy of the automobile when it comes to stop is given as,

According to work-energy theorem, the work is equal to change in kinetic energy. Therefore,

Substituting all known values,

Here, negative sign indicates that the work is done on the system.

Therefore, the work done to bring the automobile to stop is 312500 J.

Answer:

A. 0.8 m/s to the right

Explanation:

To find the momentum of the second astronaut, we need the momentum of the first one.

The momentum of astronaut 1, we will call it \(p_{1}\), is equal to mass * velocity:

\(p_{1} =82.6*-0.7\\p_{1} =-57.82\)

The momentum is negative since the left direction is considered negative.

Use the formula \(\frac{p}{m} =v\) to find velocity:

\(57.82/72.3 = v\\0.7999 = v\\ 0.8 = v\)

The astronaut must be moving to the right, since the first astronaut gave an impulse to the other astronaut to the right, therefore: 0.8m/s to the right.

Answer:

hi what is your question?? say in English please

The recoil speed of the catapult is 6.96 m/s.

The rate at which a body's displacement changes in relation to time is known as its velocity. Velocity is a vector quantity with both magnitude and direction. SI unit of velocity is meter/second.

Given parameters:

Mass of the catapult : M = 1400 kg.

Mass of the boulder: m = 75 kg.

Velocity of the rock: v = 130 m/s.

We have to find: recoil speed of the catapult: V = ?

From the principle of conservation of linear momentum:

momentum of the boulder = - momentum of the  catapult

⇒ mv = - MV

⇒ v = -mv/M = - (75 × 130)/1400 m/s = - 6.96 m/s

Negative sign indicates recoil of the catapult is in opposite direction of motion of the boulder.

So, the recoil speed of the catapult is 6.96 m/s.

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Answer:

B.

Explanation:

hope it helps

give me brainliest

Answer:

A.

Explanation:

because it lifts up the plane pls give me brainliest

The statement that describes the transformation of the graph of function f onto the graph of function g is: The graph shifts 2 units right and 7 units down.

To determine the transformation of the graph of function f onto the graph of function g, we compare the two functions f(x) and g(x) and observe the changes in the equations.

The function f(x) = (1/x - 3) + 1 represents a reciprocal function that is shifted vertically 1 unit up and horizontally 3 units to the right. The reciprocal function is reflected about the line y = x.

The function g(x) = (1/(1 + 4)) + 3 simplifies to g(x) = 4 + 3 = 7, which is a constant function representing a horizontal line at y = 7.

By comparing the equations, we can see that the transformation from f(x) to g(x) involves the following changes:

The term 1/x in f(x) is replaced by the constant 1/(1 + 4) in g(x), resulting in a vertical shift of 7 units up.

The term -3 in f(x) is replaced by 3 in g(x), resulting in a vertical shift of 3 units up.

The +1 in f(x) is replaced by +3 in g(x), resulting in an additional vertical shift of 2 units up.

Therefore, the overall transformation is a shift of 2 units to the right and 7 units down.

Hence, the correct statement is: The graph shifts 2 units right and 7 units down.

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Answer:

Its resultant velocity will be 320 km/h.

Explanation:

The tail wind is called the wind that brings greater speed to an airplane, because it has the same direction as the airplane and, therefore, contributes a positive force to the force that the airplane's engines print on it.

Thus, a tailwind adds its speed to the speed of the plane, developing a resulting speed higher than that marked on the air transport speedometer.

In the case, given that the speed of the plane is 240 km / h and the tail wind is 80 km / h, the resulting speed will be 320 km / h.

The expression for the initial velocity at point A is:

0 = (velocity at point A - 0) / time

Simplifying the equation, we find:

Velocity at point A = 0

The initial velocity at point A is zero, indicating that the object starts from rest before sliding on the horizontal plane AB.

To write an expression for the initial velocity at point A, we need to analyze the forces acting on the object and apply the principles of motion.

Given:

Mass of the object, m

Radius of the semi circle, R

Coefficient of kinetic friction, μ\(_k\) = 0.5

Force applied at point C, F = 3mg

The object is initially at rest.

Let's break down the motion into two parts: the motion on the horizontal plane AB and the motion along the semi circle BCD.

1. Motion on the horizontal plane AB:

The only force acting on the object on the horizontal plane is the force of kinetic friction. The frictional force can be calculated using:

Frictional force, f = μ\(_k\)* Normal force

The normal force is equal to the weight of the object, which is mg.

Normal force, N = mg

Frictional force, f = μ\(_k\) * mg

The frictional force acts in the opposite direction to the motion, so its magnitude is negative. Thus, the net force on the object on the horizontal plane is:

Net force = -f = -μ\(_k\)* mg

Using Newton's second law, we can relate the net force to the acceleration:

Net force = mass * acceleration

-μ\(_k\) * mg = m * acceleration

The acceleration can be expressed as the rate of change of velocity:

Acceleration = (final velocity - initial velocity) / time

Since the object is initially at rest, the initial velocity is zero.

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Answer:

Energy is flowing from the air and the table to the ice cream, which causes the ice cream to melt

For the dish of ice cream, energy is flowing from the air and the table to the ice cream, which causes the ice cream to melt.

The energy transfer is the process of conversation of the one of energy into the another form. This energy can be transfer from heat energy to mechanical energy or from light energy to electric energy.

Here, the dish of ice cream was left out on a table and is beginning to melt.

As the dish of ice cream is melt, then there is the endothermic process (the process in which the energy is released in the form of light or heat) take place.

As the endothermic process is the process in which the energy is released in the form of light or heat.

Thus, in order to melt the dish of ice cream, it need to absorb the energy by the ice cream to melt. This energy is transferred from the surrounding to the ice cream.

Thus, for the dish of ice cream, energy is flowing from the air and the table to the ice cream, which causes the ice cream to melt. Option D is the correct option.

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Hi there! :)

In this situation, the tension in the string is responsible for two things:

- Its vertical component balances the weight of the ball

- Its horizontal component results in a centripetal force

Using the angle from the vertical, the tension's COSINE component would be its vertical component and its SINE component the horizontal component.

i.

We can use right-triangle trigonometry to solve.

We know that the string itself is 40 cm long, and the horizontal leg of the string (opposite side from the vertical angle) is 10 cm.

We can use sine to solve.

Recall:
\(sin\phi = \frac{O}{H}\)

Plug in the values and solve for the angle made by the string and the vertical.

\(sin\phi = \frac{10}{40} \\\\sin^{-1}(\frac{1}{4}) = \phi\\\\\phi = \boxed{14.478^o}\)

ii.

Begin by summing forces in the vertical direction to solve for tension.

\(\Sigma F = T_y - F_g\)

Since the forces are balanced (there no acceleration in the vertical direction), ∑F = 0.

\(0 = T_y - F_g\\\\T_y = F_g\)

The force of gravity (Fg) is equivalent to:
\(T_y = F_g = mg\)

Ty is the cosine component. We can now solve for the tension.

(Using g≈ 9.8 m/s²)

\(Tcos(14.478) = mg \\\\Tcos(14.478)= (0.1)(9.8) \\\\T = \frac{(0.1)(9.8)}{cos(14.478)} = 1.012 N\)
We can use this value of 'T' to solve for the net force in the horizontal direction, and subsequently, the ball's angular speed.

Let 'Tx' represent the horizontal component of tension (sine).

In the horizontal direction, we only have the force of tension acting on the ball that results in a net centripetal force.

\(F_{xnet} = T_x = m\omega^2 r\)

\(Tsin\phi = m\omega^2 r\)

Rearrange the equation to solve for ω.

\(\omega^2 = \frac{Tsin\phi}{mr}\\\\\omega = \sqrt{\frac{Tsin\phi}{mr}} = \sqrt{\frac{1.012sin(14.478)}{(0.1)(0.1)} }= \boxed{5.03 \frac{rad}{s}}\)

**The last question is unfinished, so I am unable to answer it at this time.

Answer:

The correct answer for this would be D.

Explanation:

Are tight coils of DNA

Answer:

A. 40 N

Explanation:

To find force with acceleration and mass we use the equation f=ma

f stands for force

m stands for mass

a stands for acceleration

Now we substitute

f=50*0.8

f= 40

Remember that force is measured in newtons. So A. 40 N is the correct answer.

Use the formula a = v / t to determine acceleration, where v stands for the change in velocity and t for the time it took for the change to take place. Use SI units for force (newtons), mass (kg), and acceleration when utilizing this formula (meters per second squared). Thus, option A is correct.

The acceleration of an object is equal to the net force exerted on it divided by its mass, or a = F m, in accordance with Newton's second rule of motion. When the mass of an item and the net force acting on it are known, the acceleration of that object can be determined using this equation for acceleration.

Therefore, An object's force is equal to its mass times its acceleration, or F = m a. To apply this formula, you must use SI units for force (newtons), mass (kilograms), and acceleration (meters per second squared).

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The correct answer is 9.11 g m/s^2

Height from which a cat drops, h = 3.6 ft = 3.6 x 0.305 m = 1.098 m

Distance travelled to stop the cat, s = 12 cm = 0.12 m

Using the equation, v^2 = u^2 + 2as,

v^2 = 0 + 2gh = 2 x 9.8 x 1.098 = 21.52

v = 4.63 m/s

Speed of the cat when it the floor, v = 4.63 m/s

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Answer:

the energy released or created is  4.5 x 10¹⁸ J

Explanation:

Given;

mass of the given matter (man), m = 50 kg

Apply Einstein's mass defect equation.

When a mass of any given matter is completely destroyed, the energy released is calculated as follows;

E = mc²

where;

E is the released or created

c is the speed of light = 3 x 10⁸ m/s

E = (50) x (3 x 10⁸)²

E = 4.5 x 10¹⁸ J

Therefore, the energy released or created is  4.5 x 10¹⁸ J

Inertia: tendency of an object to resist changes in its velocity. An object at rest has zero velocity - and (in the absence of an unbalanced force) will remain with a zero velocity. Such an object will not change its state of motion (i.e., velocity) unless acted upon by an unbalanced force.

In 7.5 s, 4200 waves will pass a given point. Then, the frequency of the waves is 560 Hz.

Frequency is the number of cycles or oscillations of a wave that occur in one second, measured in Hertz (Hz). It is the rate at which a wave completes a full cycle, which is usually measured as the number of wavelengths that pass a fixed point in a unit of time.

The formula for frequency is;

frequency = waves/time

Where "waves" is the number of waves that pass a given point and "time" is the time it takes for those waves to pass.

In this case, we know that 4200 waves pass a given point in 7.5 seconds, so we can plug those values into the formula;

frequency = 4200/7.5

Simplifying;

frequency = 560

Therefore, the frequency of the waves is 560 Hz.

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Increasing the separation distance between objects decreases the force of attraction or repulsion between the objects. And decreasing the separation distance between objects increases the force of attraction or repulsion between the objects. Electrical forces are extremely sensitive to distance.

The increment of the electric force by each factor should be explained below.

An electric force refers to the interaction of the attractive force or the repulsive force that lies between two charged bodies. In the case when there should be increment in the separation distance that lies between the objects so it reduced the attraction force. Due to the reduction in the seperate distance there should be an increment in the attraction force. Also, the electric force should be very sensitive with respect to the distance.

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Answer:

A. 1.

B. 5.

C. 3.

D. 4.

E. 6.

F. 4.

Explanation: