A mother with a weight of 60 N is seated on the left side of a see-saw which is 3 m away from the pivot and her son with a weight of 40 N is seated at a distance of 4m on the right. Where should the sister of 10 N be seated to balance the see-saw?​

Answer:

30,000kg m/s²

Explanation:

Force=mass ×acceleration

Acceleration = Change in Velocity /time

Acceleration =V2-V1/T

Acceleration= 30-15/2

Acceleration =15/2

=7.5m/s²

Force = 4000kg × 7.5m/s²

=30,000kgm/s²

You can also place the answer in Newton (N)

Answer:

C.

Explanation:

c. the source is written by the person who conducted the experiment. A primary source is an original piece of information created at the time under study. It can be a diary, a letter, a photograph, a recording, or any other type of artifact. It provides firsthand information about an event or topic, and is created by a person who was directly involved or witnessed it.

Mallory pushes her water bottle of 1. 70 kg to the side. She applies a force of 108. 20 N to the right. If the bottle accelerates at 8. 79 m/s2, the coefficient of friction is 5.5 .

The friction coefficient is the ratio of the normal force pressing two surfaces together to the frictional force preventing motion between them. Typically, it is represented by the Greek letter mu (μ). In terms of math, is equal to [tex]\frac{F}{N}[/tex], where F stands for frictional force and N for normal force. The coefficient of friction has no dimensions because both F and N are measured in units of force (such as newtons ). For both static and kinetic friction, the coefficient of friction has a range of values. When an object experiences static friction, the frictional force resists any applied force, causing the object to stay at rest until the static frictional force is removed. The frictional force opposes an object's motion in kinetic friction.

According to the equation,

F - f = ma

where,

F is force applied,

f is friction between surfaces,

m is the mass of the water bottle and,

a is the acceleration.

Substituting the values and solving for f,

f = F - ma

f = 108.20 - 14.9

f = 93.3 N

f = μN

where,

μ is the coefficient of friction and,

N is the normal reaction.

substituting the values and solving for μ,

coefficient of friction = 5.5

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The lines of iron fillings will be attracted towards the poles of the magnet on the paper. The fillings gets sticked on the magnet. The glass or plastic will stop the passage of the magnetic lines of force .

Magnetic field lines are lines of force generated by a strong magnetic field. For a bar magnet, the magnetic south pole and north pole are having stronger magnetic fields than the middle part.

When magnetically susceptible materials comes in contact with a magnet they gets attracted to the poles of the magnet. The fields lines of the material gets aligned parallel to the applied field.

Some materials such as paper and glass are not showing magnetic properties. Hence, they can stop the passage of magnetic field lines. If we place a glass or paper in between the poles of a two magnets, they will stick to the glass from both ends due to the attraction to the opposite pole.

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(C) Less current leaves a resistor than enters it, so the voltage must go down as well.

Materials that are poor conductors of electricity are called insulators. Wood, glass, plastics, and non-metal elements made of hydrocarbon polymers are among the examples. As electricity cannot pass through these materials.A poor conductor is a material for which conductivity is low, yet sufficient to exhibit significant loss. To be clear, the loss we refer to here is the conversion of the electric field to current through Ohm's law. The threshold of significance depends on the application.Conductors conduct electrical current very easily because of their free electrons. Insulators oppose electrical current and make poor conductors.

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At this moment, the block will start to speed to the left as the spring starts to apply force on it.

The definition of force in physics is: The press or pull on a massed object changes its velocity. An agent with the ability to change a body's resting or active condition is known as an external force.

The word "power" has a specific meaning in physics. Calling a force at this point a pressing or a pull is perfectly appropriate. A force does not "be in it" or "be contained by" an object. One thing experiences a force from another. Both biological things and inanimate objects can be considered forces.

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Answer:

To calculate the moving energy, we can use the formula:

Em = (1/2) * m * v^2

where: m = mass of the object v = velocity of the object

First, we need to convert the velocity from kilometers per hour (km/h) to meters per second (m/s), since the formula requires the velocity to be in m/s:

v = 90 km/h = 25 m/s (approximately, since 1 km/h = 0.27777778 m/s)

Now, we can plug in the values into the formula:

Em = (1/2) * m * v^2 Em = (1/2) * 300 kg * (25 m/s)^2 Em = 281,250 J

Therefore, the moving energy of the object is approximately 281,250 Joules.

The orbital velocity, if Ingenuity is on the surface of Mars is 3549.67 m/s

Orbital velocity is also called as critical velocity. It is minimum velocity must be given to the satellite or the body, so that it can revolve around the planet. i.e. orbital velocity is minimum velocity of body to revolve in stable orbit around a planet.

Orbital velocity is given by,

[tex]v_{c} =\sqrt{\frac{GM}{R+h}}[/tex] where  G = Gravitational constant (6.673×10⁻¹¹ Nm²/kg²)

                                M = Mass of the planet

                                R = Radius of the planet

                                 h = height of the object(satellite)

Orbital velocity depends on mass of the planet, radius of the planet and height of the object(satellite). It is independent of mass of the body(satellite).

Given,

M = 6.42×10²³ kg

R= 3.4×10⁶ m

h= 0 m (our body is on surface of the mars so)

Putting these values in the equation.

[tex]v_{c} =\sqrt{\frac{GM}{R}}[/tex] = [tex]\sqrt{\frac{(6.673*10^{-11}) (6.42*10^{23}) }{3.4*10^{6}}}[/tex]

[tex]V_{c}[/tex]= 3549.67 m/s

Hence Orbital velocity of Ingenuity on the surface of Mars 3549.67 m/s

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The total binding energy of the apple is 1,000,000 Joules. Out of these much energy, 550,000 Joules of binding energy are wasted during digestion. Then, 450000 J or binding energy remains.

Binding energy of an object is the minimum energy required to break a chemical bond in a compound or the bonds between the particles of a system.

The binding energy of a substance depends on the bond type, presence of any impurities, temperature, phase of the substance etc. Given the binding energy of the apple is 1,000,000 Joules.

The energy wasted during digestion = 550,000 Joules

then the remaining energy = total energy - wasted energy

                                             = 1,000,000 Joules - 550,000 Joules

                                             =  450000 J.

Therefore, the energy remains in the person is 450000 J.

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The momentum of the baseball will be "4.20 kg.m/s".

Given values are:

Mass,

Velocity,

As we know the formula,

→ [tex]Momentum=Mass*Velocity[/tex]

or,

→                 [tex]P=mv[/tex]

By substituting the given values, we get

→                     [tex]=0.14*30[/tex]

→                     [tex]=4.20[/tex] [tex]kg.m/s[/tex]

Thus the above answer is correct.

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Where a river flows from an area of hard rock to an area of soft rock, the softer rock may wear away, eventually forming a drop called a waterfall. Thus, the correct option is B.

A waterfall is a river or other body of the water's steep which fall over a rocky ledge into a plunge pool below. Waterfalls are usually also called as cascades. The process of erosion, the wearing away of the earth, plays an important part in the formation of waterfalls in the world.

Waterfalls are generally created when the riverbed changes suddenly from the hard rock to soft rock. Rapids are formed where a fast-flowing river quickly cuts downwards through the waterbed of hard and soft rocks, eroding the soft rock and leaving the hard rocks which are standing above the water surface.

Where a river flows from an area of harder rock to an area of the softer rock, the softer rock may wear away, and it eventually results into the formation of a drop called a waterfall.

Therefore, the correct option is B.

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The current flowing through the battery is 46.67 A.

The first step is to calculate the equivalent resistance of the circuit, which includes the resistance of the loop and the internal resistance of the battery. Since the points P and Q are connected to the battery, they are effectively in parallel, so the equivalent resistance is,

1/R = 1/40 Ω + 1/0.5 Ω = 0.025 Ω

R = 40 Ω || 0.5 Ω = 0.024 Ω

The total current flowing through the circuit is given by Ohm's law, I = V / (R + r), where V is the voltage of the battery, r is its internal resistance, and R is the resistance of the loop.

Substituting the given values,

I = 24 V / (0.024 Ω + 0.5 Ω) = 46.67 A

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--The complete question is, A circular loop has a resistance of 40Ω. Two points P and Q of the loop, which are one quarter of the circumference apart are connected to a 24V battery, having an internal resistance of 0.5Ω. What is the current flowing through the battery.--

Answer:

If hydropower were to be our primary way for generating electricity, it would have several effects on individuals and the environment, both positive and negative. Here are some examples:

Positive effects:

Hydropower is a renewable energy source, meaning that it does not produce greenhouse gas emissions and does not contribute to climate change.

Hydropower can provide a stable and reliable source of electricity, as water can be stored in reservoirs and released when needed to generate electricity.

Hydropower can create jobs in construction, maintenance, and operation of hydroelectric power plants.

Negative effects:

The construction of large dams for hydropower generation can have significant impacts on ecosystems and communities. For example, it can disrupt the natural flow of rivers and waterways, causing changes in water temperature, sediment transport, and dissolved oxygen levels, which can harm aquatic habitats and species. It can also lead to the displacement of communities living in the area.

Dams can cause soil erosion, which can lead to the buildup of sediment in rivers and reservoirs, reducing their capacity and lifespan.

The construction of dams and reservoirs can also result in the loss of productive agricultural land and natural habitats.

In areas where water resources are scarce, the use of large amounts of water for hydropower generation can compete with other uses such as agriculture, drinking water supply, and ecosystems.

Overall, the impact of hydropower as a primary source of electricity would depend on the specific location, design, and management of hydroelectric power plants. Proper planning, environmental impact assessments, and community engagement are necessary to minimize negative impacts and maximize benefits.

Explanation:

hope it help pa brainliest po

Salt, or NaCl, is an example of an ionic compound. Ionic compounds are formed when a metal combines with a non-metal through the transfer of electrons.

Crystalline compounds are compounds that have a well-defined, ordered, and repeating three-dimensional arrangement of atoms, ions, or molecules in a solid state. In a crystalline compound, the constituent particles are arranged in a highly ordered and repeating pattern called a crystal lattice.

In the case of NaCl, the sodium (Na) donates an electron to the chlorine (Cl), forming an ionic bond between them and resulting in the formation of an ionic compound. Ionic compounds typically have high melting and boiling points, are crystalline in structure, and conduct electricity when dissolved in water.

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The spring constant k is approximately 1520 N/m by using conservation of energy?

We can use the conservation of energy to find the spring constant k. Initially, the block has potential energy stored in the compressed spring, which is then converted to kinetic energy as the block slides across the track. At the point where the block leaves the track, all of the stored energy has been converted to kinetic energy. Neglecting air resistance, we can assume that the kinetic energy of the block at this point is equal to the potential energy stored in the spring:

[tex](1/2)kx² = (1/2)mv²[/tex]

where x is the distance the spring is compressed (0.049 m), m is the mass of the block, and v is the velocity of the block when it leaves the track.

Since the block is initially at rest, we can also use kinematic equations to relate the velocity of the block to the distance it travels along the track before leaving it. The horizontal displacement of the block is unknown, so we'll call it d:

d = (1/2)at²

where a is the acceleration of the block along the track and t is the time it takes to travel that distance. The acceleration of the block is determined by the force applied by the spring:

F = kx

ma = kx

a = kx/m

Now we can substitute this expression for acceleration into the kinematic equation:

[tex]d = (1/2)(kx/m)t[/tex]²

Since the block leaves the track horizontally, its vertical displacement is given by:

y = (1/2)gt²

where g is the acceleration due to gravity.

Combining these equations, we can eliminate t and solve for k:

[tex](k/m)(0.049)² = g(2y/g)(2d/(k/mg))²[/tex]

Simplifying, we get:

[tex]k = (mg²d)/(0.049²(4y + gd))[/tex]

Substituting the given values for m, d, and y, and the acceleration due to gravity g = 9.81 m/s², we get:

[tex]k = (0.4 kg)(9.81 m/s²)²(2.3 m)/[(0.049 m)²(4(0.8 m) + (9.81 m/s²)(2.3 m))][/tex]

k ≈ 1520 N/m

Therefore, the spring constant k is approximately 1520 N/m.

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Answer:

When the hands are close together on the handlebars of a bike, the steering is more sensitive and requires more effort to make small adjustments. This is because the steering axis of the bike, which is an imaginary line passing through the center of the front wheel and the center of the steering tube, is shorter. This means that even small movements of the handlebars translate to larger changes in the direction of the front wheel.

On the other hand, when the hands are far apart on the handlebars, the steering is less sensitive and requires less effort to make adjustments. This is because the steering axis of the bike is longer, meaning that larger movements of the handlebars are required to achieve the same change in direction of the front wheel.

Overall, the sensitivity of the steering depends on the length of the steering axis, which in turn depends on the distance between the hands on the handlebars. Therefore, it is more difficult to steer a bike when the hands are close together on the handlebars than when they are far apart.

Explanation:

The function has a y intercept at 10 and the function approaches 10 as x approaches infinity.

The correct answers are A and C.

A function is a mathematical rule that assigns a unique output (dependent variable) for every input (independent variable). In other words, a function is a relationship between two or more variables where each input has exactly one output. The output value depends on the input value and the rule that governs the relationship between them. A function can be represented as a graph, table, or formula.

From the given question above;

A. The function has a y intercept at 10 because when the mass is 0, the length of the spring is 10 inches.

C. The function approaches 10 as x (mass) approaches infinity because the length of the spring will increase as the mass increases.

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A weight lifter does 1700.44 Joules of work to lift the barbell from the floor to a height of 9.90 meters.

To calculate the work done by the weightlifter, we need to use the formula:

Work = force x distance x cos(theta)

where force is the weight of the barbell, distance is the height it is lifted, and theta is the angle between the force and the direction of motion. Since the weightlifter is lifting the barbell straight up, theta is 0 degrees and cos(theta) is 1.

So, we have:

Work = 171.60 N x 9.90 m x 1

Work = 1700.44 Joules

Therefore, the weightlifter does 1700.44 Joules of work to lift the barbell from the floor to a height of 9.90 meters.

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Core samples provide us with the actual rocks from inside Earth. They are considered direct evidence of Earth's interior.

Rocks from the interior of the Earth are actually sampled via core samples. These are regarded as concrete proof of the interior of the Earth. Because they take a direct sample of the rocks that make up the layers that make up the Earth's surface and core, core samples provide clear proof of what is inside the planet.

Researchers can identify differences in weather patterns and climatic changes across time using geological core samples. Also, there may be proof of species, as well as the sedimentary make-up of lake and river beds, for instance. The dynamic character of the Earth's formation and how it changes through time are directly demonstrated by core samples. Where there are changes in the composition of the Earth can be determined thanks to seismic waves.

Seismograms can be used by geologists to determine the various components of the Earth's internal structure, such as which regions are solid, molten, or made of gases.

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Correct question is:

________ provide us with the actual rocks from inside Earth. They are considered ________ evidence of

The helicopter generates 29,400 Joule of work. If a helicopter is using two individuals to take them out of the water, the helicopter will hoist the two people, who together weigh 150 kg, 20 meters in the air.

The definition of work done includes both the forces that were used by the body and also the overall displacement of both the body. A constant total Force is present before to this block. The goal of this force seems to be to propel the body d meters in a straight line in the force's direction.

When a weight is applied across a distance to an item, work is accomplished. This implies that the total energy of an item will be impacted when a push is given to it across a distance.

Work = Force x Distance

         = 150 kg x [tex]9.8 m/s^{2}[/tex] x 20 m

         = 29,400 J

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The recoil speed of the water pistol, given that the mass of the water pistol is 0.9 Kg is -6.39 m/s

The following data were obtained from the question:

The recoil speed of the water pistol can be obtained as illustrated below:

m₁v₁ = -m₂v₂

(0.025 × 230) = -(0.9 × v₂)

5.75 = -0.9v₂

Divide both sides by -0.9

v₂ = 5.75 / -0.9

v₂ = -6.39 m/s

Thus, we can conclude that the recoil speed is -6.39 m/s

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Mass is a measure of an object's inertia, or resistance to changes in its motion. It is measured in kilograms (kg).

Mass is a physical property of an object that measures the amount of matter it contains. It is measured in kilograms (kg) or in grams (g). Mass is different from weight, which is the measure of the force of gravity on an object. Mass is the same everywhere in the universe and is unaffected by gravity, while weight depends on gravity and can vary from place to place. Mass is an important concept in physics, as it is used to calculate energy, momentum, and other physical properties of an object.

Fnet (net force) is the sum of all the forces acting on an object. It is measured in Newtons (N).

Fapp (applied force) is the force that is applied to an object in order to change its motion. It is also measured in Newtons (N).

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The kinetic energy of the system does not change.

When two horseshoe magnets are placed next to each other, then they either attract or repel each other, depending on the position of their poles. if the poles are opposite they attract, if they are same they repel with other.

In case, if the poles of two horseshoe magnets are attracted to each other, indicating poles are opposite to each other. when the magnets are brought together then the work must be done to oppose the magnetic field between poles. This increases the potential energy of the system.

However, the question is about the kinetic energy of the system, which is related to the motion of the objects in the system. In this case, once the magnets are brought together they attract each other, they will have zero potential. Therefore, the kinetic energy will not change.

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To solve this problem, we need to use trigonometry to break the initial velocity vector into its x and y components.

What is Velocity?

Velocity is a vector quantity that describes the rate at which an object changes its position. It is defined as the displacement of an object per unit time in a particular direction.

In other words, velocity is the speed of an object in a given direction. It is a vector quantity because it has both magnitude (the speed) and direction.

The initial velocity vector can be represented as follows:

v = 15.8 m/s [19.5° above horizontal]

The x-component (vx) of the velocity vector can be found using the cosine function:

cos(19.5°) = vx / 15.8 m/s

vx = 15.8 m/s cos(19.5°) = 14.9 m/s

The y-component (vy) of the velocity vector can be found using the sine function:

sin(19.5°) = vy / 15.8 m/s

vy = 15.8 m/s sin(19.5°) = 5.25 m/s

When the water balloon strikes the ground, its y-velocity component will be zero because it will have reached the ground level. Therefore, the components of the velocity vector right before the balloon strikes the ground are:

vx = 14.9 m/s [to the right]

vy = 5.25 m/s [upward]

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The method of heat transmission from engine to the person is through radiation.

Heat is a form of energy which is transferred between bodies having different temperature.

Here,

The person near to the engine feels very warm in a moving bus. This is because of the heat transfer from the engine to the person. Here the two bodies, the person and engine are not in contact and also there is no other medium to transfer the heat between them. So, the heat is transferred from the engine to the person through radiation.

Hence,

The method of heat transmission from engine to the person is through radiation.

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Answer:

Federal Educational Policy: Every Student Succeeds Act (ESSA)

Resources:

1. Every Student Succeeds Act (ESSA): https://www.ed.gov/essa

2. What is the Every Student Succeeds Act (ESSA)?: https://www.edweek.org/ew/section/multimedia/what-is-the-every-student-succeeds-act-essa.html

3. ESSA Overview: https://www2.ed.gov/policy/elsec/leg/essa/overview.html

Poster:

Title: The Every Student Succeeds Act (ESSA)

The Every Student Succeeds Act (ESSA) is a federal educational policy that was signed into law in 2015. It replaces the No Child Left Behind Act and is designed to provide states with more flexibility in how they use federal funds to improve student outcomes.

Here are three of the most important points of ESSA:

1. States have more control over how they use federal funds to improve student outcomes, such as increasing access to high-quality early childhood education and providing more support for struggling schools.

2. ESSA requires states to set challenging academic standards and measure student progress in order to ensure that all students are meeting those standards.

3. ESSA also requires states to provide more support for traditionally underserved students, such as English language learners and students with disabilities, in order to close achievement gaps and ensure that all students have access to a high-quality education.

Explanation:

Answer:

Kinetic energy with 1250 J of energy

Explanation:

Kinetic energy formula = [tex]\frac{1}{2}[/tex]m[tex]v^{2}[/tex]

Potential energy formula = mgh

Velocity is given so we'll use kinetic energy

[tex]\frac{1}{2}[/tex]*100*[tex]5^{2}[/tex] = 1250 J