A 73-kg base runner begins his slide into second base when he is moving at a speed of 4.7 m/s. The coefficient of friction between his clothes and Earth is 0.70. He slides so that his speed is zero just as he reaches the base.
(a) How much mechanical energy is lost due to friction acting on the runner? J
(b) How far does he slide? m

Answer:

Kinetic energy is directly proportional to mass: if you double the mass, then you double the kinetic energy.

Explanation:

The faster something is moving, the greater the force it is capable of exerting and the greater energy it possesses. Thus a modest increase in speed can cause a large increase in kinetic energy.

Answer:

There are many definitions out there, but there is some common ground to them. They all tend to agree that a theory needs to be (a) substantiated, (b) explanatory, (c) predictive, and (d) testable. That is: (a) substantiated - a theory cannot be independent of prior work and evidence, there needs to be some justification of it, within previous work in the field (other currently accepted theories) and in the sum of available evidence. For (b) is needs to actually explain something about the science it is in. The explanation covers causality. So, for example, the laws of thermodynamics are laws rather than theories because they describe rather than explain what happens. (c) and (d) are linked. A theory needs to make predictions that can be tested, so that the theory itself can, in principle, be rejected. And for the theory to be sound there needs to be a genuine commitment to reject the theory of the tests fail to support it. It isn't really a theory if, for example, there is either the intent or the logical possibility of interpreting evidence both ways. There is often a fifth criterion, which is essentially a coherence or elegance - does the theory "feel" right. This can include Occam's razor, ruling out excessively or unnecessarily complicated theories, which can easily be devised. Whether all of these are truly "essential" is probably a matter of debate, defining features of any category can be a problem, but together they describe the common characteristics of typical theories, and that's a good place to start.

The :Gene, chromosomes, and nucleus is the cell components are are most involved in determining an organisms traits.

As it relates to genetics, a trait is a unique quality about a person. Genes, environmental influences, or a combination of both can influence traits. Qualitative traits, like eye color, can also be quantitative (such as height or blood pressure).

Your traits, which are features or characteristics that you inherit from your parents, are determined by the information carried by your genes (say: trates). In the human body, each cell has between 25,000 and 35,000 genes.

A trait is a unique attribute, propensity, or characteristic that someone, something, or both have. In those early months, many of our personality traits are formed. Humans are creative beings. Synonyms: trait, quality, feature, attribute additional words for characteristic

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we have that from the Question"Three people trying to move a box. Which set of forces will result in a net force on the box of 20 N to the right?" it can be said that  

From the Question we are told

Three people trying to move a box. Which set of forces will result in a net force on the box of 20 N to the right?

Generally the equation for Net Force is mathematically given as

Fn=Fx+Fy...

Therefore

The force from the option that give a  Net Force  of 20 to the right is

\(Fn=(28+10)-(18)\\\\Fn=20N\)

Therefore

The set of forces which will result in a net force on the box of 20 N to the right is

Option D

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Answer: The correct answer is A

55N, 16N, 17N

Explanation: I took the quiz

The torque about the center of mass of the beam is calculated as -400 Nm.

A measure of the force that can cause an object to rotate about an axis is known as torque. Just as force causes an object to accelerate in linear kinematics, torque causes an object to acquire an angular acceleration.

Given ; Force = 200 N; Length = 2.00 m and Mass = 3.00 kg

As we know that angular acceleration, α= τ/I rad/s²

The formula for moment of inertia is ;

I = ML²/12

Torque, τ =  F * r

= ( 200 N * -1 m) + (-200 N * 1 m)

Torque = -400 Nm

Torque about the center of mass of the beam is -400 Nm.

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The total energy of an electron traveling at a speed of 8.60 x 10^7 m/s is (3.68 x 10^-15) J.

The total energy of an electron can be calculated by the formula E=0.5mv², where E is the total energy, m is the mass of the electron and v is the velocity of the electron. We know that the speed of the electron is 8.60 x 10^7 m/s. The mass of an electron is 9.109 x 10^-31 kg.Using the formula, we can calculate the total energy as follows:E = 0.5 x (9.109 x 10^-31 kg) x (8.60 x 10^7 m/s)²E = 3.68 x 10^-15 JTherefore, the total energy of an electron traveling at a speed of 8.60 x 10^7 m/s is (3.68 x 10^-15) J. The total energy is dependent on the velocity of the electron and the mass of the electron.

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Answer:

The length of the load arm is 3 m

The length of the effort arm is 15 m

Spoons and scissors are class 1 levers

Explanation:

The data given in the force diagram of the lever (machine) are;

The length of the lever = 18 m = (Length of effort arm) + (Length of load arm)

The force applied at the effort = 100 N

The load lifted by the lever = 500 N

The mechanical advantage, MA is given as follows;

MA = Load/Effort = (Length of effort arm)/(Length of load arm)

∴ MA = 500 N/(100 N) = 5

Let 'x' represent the length of the effort arm, and let 'y', represent the length of the load arm, we have;

x + y = 18...(1) (given)

MA = 5 = x/y

∴ x = 5·y...(2)

Substituting the value of 'x' in equation (1) with x = 5·y gives;

x + y = 5·y + y = 6·y = 18

∴ y = 18/6 = 3

y = 3

The length of the load arm, y = 3 m

x = 5·y = 5 × 3 = 15

x = 15

The length of the effort arm, x = 15 m

When lifting food with a spoon, the fulcrum, which can be taken as the edge of the plate or the supporting finger, is in between bowl of the spoon and the point of application of the thumb towards the extremities of the spoon handle

Therefore a spoon is a class 1 lever

The pivot of a scissors is in between the item being cut (the load) and the holes where the finger applies an effort

Therefore, a scissors is a class 1 lever.

At point A the spinning wheel will experience least centripetal force.

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.

Centripetal force is applied on object depends on the centre and object distance. So B will experience maximum force while A is least.

At point A the spinning wheel will experience least centripetal force.

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Answer:

    flow of electron is just opposite to the flow for current. Electrons flow from the negative terminal to the positive. Conventional current or simply current, behaves as if positive charge carriers cause current flow. Conventional current flows from the positive terminal to the negative.

The resistance of the heater coil should be approximately 29.5 Ω. The power (P) dissipated by a resistor with resistance R and voltage V across it can be calculated using the formula P = V^2/R. Rearranging this formula, we can solve for R: R = V^2/P.

Substituting the given values, we get R = (125 V)^2 / 530 W = 29.5 Ω (rounded to one decimal place).

Therefore, the resistance of the heater coil should be approximately 29.5 Ω to provide 530 W of heat with a voltage of 125 V.

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The linear speed of the clothes as a spin in the barrel is 102.1 m/s.

The linear speed of the clothes is the measure of the change of displacement of the clothes with time.

Mathematically, the formula for linear speed is given as;

v = ωr

where;

The angular speed of the wash machine is given as;

ω = 1950 rpm = 1950 rev/min x 2π rad/rev x 1 min/60 s = 204.2 rad/s

v = 204.2 rad/s x 0.5 m

v = 102.1 m/s

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The correct statement that explains the observation using Newton's laws is objects at rest tend to remain in their current state of motion unless acted upon by an unbalanced force, but objects in motion require a continual application of force to stay in motion. Here option A is correct.

According to Newton's first law of motion, an object will continue moving at a constant velocity in a straight line unless acted upon by an external force. In this case, when the cannonball is shot horizontally from the cannon, it initially possesses a forward velocity due to the force applied by the cannon. However, once the cannonball is in motion, the only forces acting on it are gravity and friction.

Gravity acts vertically downward, causing the cannonball to accelerate downward. Friction acts horizontally in the opposite direction to the motion of the cannonball. As the cannonball moves forward, friction opposes its motion and gradually slows it down.

Since there is no force continuously propelling the cannonball forward, and the forces of friction and gravity act on it, the cannonball eventually comes to a stop and falls to the ground. Hence option A is correct.

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Answer:

880 N/m

Explanation:

The elastic spring constant of the trampoline fabric is 184 N/m..

Hooke’s law states that “ within elastic limit, Stress is directly proportional to the strain”.  

I.e. Stress ∝ Strain

Stress = Y Strain

Where proportionality constant Y is called as modulus of elasticity.

And it is given by Y = Stress÷Strain Where stress is “applied force(F) per unit cross sectional area(A) on which force is applied”.

I.e Stress = F/A  

strain is “ ratio of change in length to original length”

I.e Strain = Δl÷L

Since the strain is a ratio of two similar quantities therefore it is dimensionless.

Units of modulus of elasticity is N/m².

According to hook's law,

F =kx where k is called as spring constant and x is elongation.

In this problem,

Given,

height of the ball from ground = 4.95m

mass of the ball m = 4.98kg

height of the ball from surface of the trampoline = 4.95-1.02 = 3.93m

according to law of kinematics,

v² = u² + 2as

v² = 0 + 2*9.8*3.93

v = 8.77 m/s this is final velocity of ball at the surface of the trampoline.

when ball falls on the trampoline with this velocity, trampoline stretches and at distance 1.02m from surface of the trampoline, it come to rest(actually it bounce back from that point).

The acceleration produced in the ball due to trampoline is,

a = u²/2s = 8.77²/(2*1.02) = 37.7 m/s²

Hence force applied on the trampoline is,

F = ma = 4.98kg * 37.7 m/s² = 187.7 N

The spring constant k is

k =F/x = 187.7/1.02 = 184 N/m.

Hence Spring constant is 184 N/m.

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Answer:it allows you to eliminate and isolate variables.

Explanation:

The reading on the scale is 882.6 N when the elevator accelerates upwards with an acceleration of 4.90 m/s².

Given that the mass of a person is 60.0 kg and the elevator accelerates upwards with an acceleration of 4.90 m/s², we have to determine the reading on the scale.

Let F be the force exerted by the scale on the person. Then, by Newton's second law of motion, the net force acting on the person is Fnet= m * a

where m = 60.0 kg is the mass of the person and a = 4.90 m/s² is the acceleration of the elevator. Hence, the net force acting on the person is given by;

Fnet = 60.0 kg * 4.90 m/s²

Fnet = 294.0 N

Therefore, the scale reading is equal to the force exerted by the scale on the person. Since the elevator is accelerating upwards, the force exerted by the scale on the person is greater than the weight of the person, which is the force of gravity acting on the person.

The force of gravity acting on the person is given by;

Fg = m * g, where g = 9.81 m/s² is the acceleration due to gravity. Hence, the force of gravity acting on the person is given by;

Fg = 60.0 kg * 9.81 m/s²Fg = 588.6 N

Therefore, the scale reading is given by the sum of the force of gravity acting on the person and the net force acting on the person;

F = Fg + Fnet

F = 588.6 N + 294.0 N

F = 882.6 N

Thus, the reading on the scale is 882.6 N when the elevator accelerates upwards with an acceleration of 4.90 m/s².

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Answer:

1. Ultraviolet light (UV)

2. X-rays

3. Gamma-rays

Explanation:

Though there are different types of energy or electromagnetic waves with varying wavelengths, including the likes of Gamma X-rays, ultraviolet light, visible light, infrared radiation, and microwave radiation.

What is more certain is that the atmosphere blocked the high-energy waves from getting to the earth surface or biosphere such as Ultraviolet light (UV), X-rays and Gamma-rays

An example of no work after the effort is work done by the collie to travel a distance in a straight line by lifting a mass.

In physics, the word "work" involves the measurement of energy transfer that takes place when an item is moved over a range by an externally applied, at least a portion of which is applied within the direction of the displacement.

The length of the path is multiplied by the element of a force acting all along the path to calculate work if the force is constant. The work W is theoretically equivalent towards the force f times the length d, or W = fd, to portray this concept.

The amount of work done by the coolie to travel a certain distance in a straight line by lifting a certain amount of mass. Here the work done is zero because when the coolie lifted the mass the force exerted in the upward direction makes an angle of 90° and as per the formula of work done it will be equal to zero.

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The distance from the 1.00-μC point charge at which the potential is 2.00 × 10² V is 4.50 × 10⁴ meters.

To find the distance from a 1.00-μC point charge to reach a potential of 100 V, we can use the formula for electric potential:

V = k * (q / r)

where V is the potential, k is the electrostatic constant (k = 9 × 10⁹ Nm²/C²), q is the charge, and r is the distance.

Rearranging the formula, we have:

r = k * (q / V)

Substituting the given values, with q = 1.00 μC (1.00 × 10^-6 C) and V = 100 V, we can calculate the distance:

r = (9 × 10⁹ Nm²/C²) * (1.00 × 10⁻⁶  C / 100 V)

= 9 × 10⁹ Nm²/C² * 1.00 × 10⁻⁸ C/V

= 9 × 10 m

= 90 m

Therefore, the distance from the 1.00-μC point charge to reach a potential of 100 V is 90 meters.

Similarly, to find the distance at which the potential is 2.00 × 10² V, we use the same formula and substitute the new potential value:

r = (9 × 10⁹ Nm²/C²) * (1.00 × 10⁻⁶ C / 2.00 × 10² V)

= 4.50 × 10⁴ m

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Answer:

Josie's ball faster than T

According to the theory of solar system formation, the sun's slow rotation today can be explained by the conservation of angular momentum during the process of stellar formation.

The solar system is believed to have formed from a rotating cloud of gas and dust known as the solar nebula.

As the cloud collapsed under its own gravity, it began to spin faster due to the conservation of angular momentum.

As the cloud collapsed further, the majority of the mass was drawn towards the center, eventually forming the sun.

During the collapse, the solar nebula experienced a process known as "angular momentum conservation."

This means that as the cloud's radius decreased, its rotational speed increased in order to conserve the total angular momentum. As a result, the early sun had a much faster rotation rate than it does today.

Over time, as the sun evolved and contracted, its rotation rate gradually slowed down.

This is due to the transfer of angular momentum from the sun's outer layers to its interior through various processes, including magnetic fields and convective motions.

These processes act to decrease the rotational speed of the sun. As a result, the sun rotates slowly today compared to its initial formation.

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Answer:

Na+ca+CO=NACo^3

Explanation:

NA Burns violently with explosions that may spatter the material. Used for making gasoline additives, electric power cable, sodium lamps, other chemicals.

Answer:

78

Explanation:

Answer:

78

Explanation:

dakaylaRiley 12

The minimum banking angle θ be for the race-car has a mass of 750kg and needs to take the 90o turn of radius 160m in 10.0 seconds regardless of the coefficient of static friction is 21.94°.

No as the calculation :

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Extremely high temperatures and pressures in the Sun's core, where nuclear fusion takes place, force hydrogen atoms to fuse and unleash enormous amounts of energy in the form of gamma rays.

These highly energetic photons interact with many charged particles and progressively lose energy as they bounce around.

The radiative zone, which is characterized by thick plasma, is the next region through which the energy passes. As they travel through this opaque layer, photons constantly absorb and reemit while undergoing random walks.

Convection is used to move the energy once it enters the convective zone. Cooler plasma sinks back down, whereas hot plasma rises to the surface carrying the energy. Convective motion makes energy transfer to the Sun's surface more effective.

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As a result, the system's maximum spring potential energy U is given by: U = (2π^2MD^2)/P^2

Potential energy is the energy stored by an item as a result of its location relative to other objects, internal tensions, electric charge, or other reasons. Potential energy is stored energy that is affected by the relative location of various components in a system. When a spring is squeezed or extended, its potential energy increases. A steel ball has higher potential energy when lifted above ground than when it falls to Earth.

Here,

The maximum spring potential energy U can be calculated using the equation:

U = (1/2)kD^2

where k is the spring constant, which can be found from the period of oscillation using the equation:

k = (4π^2M)/P^2

Substituting the expression for k into the equation for U, we get:

U = (1/2)((4π^2M)/P^2) * D^2

So the maximum spring potential energy U of the system is given by:

U = (2π^2MD^2)/P^2

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(a) The image distance is -10.8 cm (negative sign indicating a real and inverted image).

(b) The height of the image is -1.35 cm (negative sign indicating an inverted image).

(a) Using the lens formula (1/f = 1/do + 1/di), where f is the focal length and do and di are the object distance and image distance, respectively, one can calculate the image distance. We may get di by using the information that the object distance (do) is 5.4 cm and the focal length (f) is 19 cm. We discover that 1/19 = 1/5.4 + 1/di after summing the values. The answer to this equation is di = -10.8 cm.

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The evolution of energy matrices, the social and environmental consequences of energy sources, and the relationship between energy development and industrial development are critical aspects of understanding the interplay between energy and the modern world. Balancing the need for energy with sustainability and minimizing environmental impacts is a key challenge for societies today.

a) The evolution of the main energy matrices after the industrial revolution:

The industrial revolution marked a significant shift in the sources of energy used to power the growing industries and societies. Prior to the industrial revolution, human and animal labor, along with limited use of water and wind power, were the primary sources of energy. However, with the advent of steam engines and mechanization, there was a need for more abundant and efficient sources of energy.

Coal: Coal became the dominant energy source during the early stages of the industrial revolution. It provided the necessary fuel for steam engines and played a crucial role in powering factories, railways, and steamships.

Oil: The discovery and commercialization of oil in the late 19th century revolutionized the energy landscape. Oil became a major source of energy for transportation, as it fueled the internal combustion engines of automobiles, trucks, and airplanes.

Natural Gas: With the expansion of oil drilling, natural gas also emerged as an important energy source. It is used for heating, electricity generation, and as a feedstock for various industrial processes.

Nuclear Energy: The development of nuclear power in the mid-20th century introduced a new source of energy. Nuclear reactors harness the energy released from nuclear fission reactions to generate electricity.

Renewable Energy: In recent decades, there has been a growing emphasis on renewable energy sources such as solar, wind, hydroelectric, and geothermal power. These sources offer sustainable alternatives to fossil fuels, with lower environmental impact and the potential for long-term energy security.

b) The social and environmental consequences of these energy sources:

Each energy source has its own social and environmental consequences:

Fossil Fuels: The burning of fossil fuels, such as coal, oil, and natural gas, releases greenhouse gases and contributes to climate change. Extraction of fossil fuels can lead to habitat destruction, water pollution, and health hazards for workers and nearby communities.

Nuclear Energy: While nuclear energy does not produce greenhouse gas emissions during operation, it presents risks associated with accidents, radioactive waste disposal, and potential weaponization of nuclear materials. Public safety concerns and environmental risks have led to debates over the use of nuclear power.

Renewable Energy: Renewable energy sources offer benefits in terms of reduced greenhouse gas emissions and environmental sustainability. However, their deployment may require land use changes, and some technologies (e.g., large-scale hydroelectric dams) can cause ecological disruptions and displacement of communities.

c) The relationship between energy development and degree of industrial development:

Energy development and industrial development are closely intertwined. The availability of affordable and reliable energy sources is crucial for driving industrialization and economic growth. Access to abundant energy resources enables countries to power their industries, expand transportation networks, and improve living standards.

Countries that have invested in the development and exploitation of energy sources have typically experienced accelerated industrialization and technological advancement. The ability to secure and utilize energy resources efficiently has been a determining factor in a country's competitiveness and economic prosperity.

Conversely, countries that lack access to energy sources or fail to invest in their energy sectors may face challenges in industrial development. Limited energy availability can constrain production capacities, limit access to modern technologies, and hinder economic progress.

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The potential impacts of global climate change on thermohaline circulation in the oceans is increasing the rate of circulation. That is option D.

The thermohaline circulation is defined as the process by which deep-ocean currents are driven by differences in the water's density, which is controlled by temperature (thermo) and salinity (haline).

When there is global climate change increased temperature of water masses would cause these currents to flow faster given the higher kinetic energy of the water molecules.

Therefore, there is increase in rate of circulation when there is global climate change.

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