a service elevator takes a load of garbage, mass 20.7 kg, from a floor of a skyscraper under construction down to ground level, accelerating downward at a rate of 1.7 m/s2. find the magnitude of the force (in n) the garbage exerts on the floor of the service elevator.

The graph that best represents the relationship between the velocity of an object thrown straight upward from the Earth's surface and the time that elapses while it is in the air is (option D)

Velocity is the directional speed of a moving object as an indicator of its rate of change in location as perceived from a certain frame of reference and measured by a specific time standard.

In other words, velocity is the primary indication of an object's location as well as its speed. It is defined as the distance traveled by an item in one unit of time. The displacement of an item in unit time is defined as velocity.

The equation that speaks to the velocity at a vertically upwards object that is accelerated against gravity and time is given as:

v = u + at; where

v = velocity

u = point from which the object starts to move

a is acceleration; and

t is time.

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The gravitational potential energy is always measured relative to the ground.

The gravitational potential energy of a system is related as.

PE = MgH

Where,

M is the mass of body,

g is the acceleration due to gravity,

H is the height of the body with respect to the ground.

As we know, for a particular surface on earth, the mass and g is always constant.

Only the height of the body is changing with respect to the ground, Hence we can conclude here, that gravitational potential energy of a body is measured with respect to the ground.

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Answer:

As P is increased from mg(sinθ−μcosθ) to mg(sinθ+μcosθ) frictional force will change from mgcos ( upwards parallel to inclined plane) to 0 to mgcos (downwards parallel to inclined plane). Under the approximation of linear variation of P the correct option is A.

For many-electrons systems, each principle energy level is split into  sublevels of differing energies. Energy of orbital in such system is affected by nuclear charge, by repulsions between electrons and by orbital shape.

Each principal energy level is split into closely spaced sublevels. This quantum number is named the orbital shape quantum number as each orbital in a given type of sublevel has the same electron cloud shape.

Each energy sublevel corresponds to an orbital of a different shape that describes where the electron can be found and the energies of electrons are said to be quantized.

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5,000 Megawatt hour, amount of energy is produced by the power plant , which operates at steady power of 100 Megawatt.

Power is defined as rate of doing work or it is the work done per unit of time .

mathematically, P = W/t

where, P--> power in watt

W ---> work done by body in joule and t-----> time taken to do work in sec

but as we know Energy is defined as capacity to do work . Then it is same as work done. The S.I units of energy is joule.

So, power in form of energy is defined as amount of energy transferred per unit of time.

mathematically, P = E/t

We have , power of plant (P) = 100 megawatt

time (t) = 50 hours

put in above formula we get, 100 MW

= energy/ 50 hours

Energy = power × time = 100MW × 50 hours

= 5000 Megawatt hours

So, energy produced by the power plant of 100 ME is 5,000 Meagawatt hour.

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The net force on the woman while she was stopped by the sand is 28800 N.

Force can be defined as the product of the mass of a body and its acceleration.

To calculate the net force on the woman, we use the formula below.

Formula:

Where:

From the question,

Given:

Substitute these values into equation 1

Hence, the  net force on the woman is 28800 N.

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The intensity of the sound at a distance of 0.40 m from the source is 0,398 W/m²

Sound waves are classified as a longitudinal wave where the direction of propagation is parallel to the direction of vibration.

Sound intensity is formulated as follows:

I = P / A

I = Sound Intensity (W/m²)

P = Power of the Sound Source (W)

A = Area of the field through which the sound wave passes (m²)

Since the sound wave propagates in all directions, the area of the field traversed by this sound wave will form the surface area of the sphere, then:

I = P / (4πR²)

R = Surface radius (m)

So, The intensity of the sound at a distance of 0.40 m from the source is:

I = P / A

I = P / ( 4π . R² )

I = 0,80 / ( 4π . (0,4)²)

I = 0,398 W/m²

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The magnitude of the net force on the bobsled is found to be 270 Newton.

The mass of the bobsled is 75.9 Kg, the bobsled is pushed by two athletes till a distance of 7.9 m with a speed of 7.5m/s.

The work energy theorem says,

The work done by a force is equal to the total change in kinetic energy of the body.

Let us say that the bobsled starts from rest, so, we can write,

Fs = 1/2MV²

F is the net force on the bobsled,

s is the distance to which it is moved,

M is the mass of the bobsled,

V is the speed of the bobsled.

Putting values,

F(7.9) = 0.5 x 75.9 x 7.5 x 7.5

F = 270 N.

The net force on the bobsled is 270 N.

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To determine the total number of microstates, we need to determine the density of states in one dimension. The density of states function (g(E)) is the number of microstates per unit length per unit energy range.

In one dimension for a particle of mass 'm' in a box of length 'L' we have the energy given
E: hk2 2

From the boundary conditions of the cuboid at x=0 and x=L, we deduce that 'k' can take on discrete values ​​in units of 2π/L. Consequently, the quantum states are in units of L/2π. The number of states 'N' for momentum 'k' will be equal to,

2KL N = TT

And the energy E at any momentum "k" is given by

E: hk2 2

The density of states in 1D is given by

9(E) 1 IN L DE = 1 DN dk L dk de

we know

NP 27 dk 1

AND,

hk DE Ε dk dk dЕ = m hk m

Notation in terms of energy E,

dk DE -m 1/2 E-1/2 -1/2

The density of states will be

9(E) 1 dN 1 dN dk IDE = I dk DE L L dE V2 m1/2E-12 πh

The total number of microstates at energy 'E' is,

2m Z(E) = [” 9(E)E = Z dE = E-1/2 DE 6.* -12dE = 22m VE ић пh

(i) A two-particle system will have the number of microstates will be,

Z(E) = 21(E1Z2E - E1)

where Z1 and Z2 are the microstates due to particle 1 and particle 2 calculated above. E1 is the energy of particle 1, so the energy of particle 2 is E-E1.

(ii) For indistinguishable particles, the number of microstates will be

Z(E) 21(E1)Z2(E – E1) 2!

​​​​where Z1 and Z2 are the microstates caused by particle 1 and particle 2, respectively, calculated as above. E1 is the energy of particle 1 and (E-E1) is the energy of particle 2. 2! it comes as a result of the fact that if we exchange two particles, due to their indistinguishability, the result will be the same.

E is the total energy of the system for both the above cases.

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The layer that the hot-air balloon can travel to, in the layer of the atmosphere is troposphere. its can't a go to higher layers because it would be  affected by density.

The troposphere servesv as the lowest layer of Earth's atmosphere however it has the mass (about 75-80%) of the atmosphere  and most of  tthe types of clouds  can be seen in the troposphere, then the weather occurs within this layer.

It should be noted that the troposphere has the highest density, as well as the greatest air pressure,  however the water vapor, and a temperature range from 62,  layer that the hot-air balloon can travel to, in the layer of the atmosphere is troposphere.

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It is the oblique angle of the waves breaking on the beach that causes longshore drift, which is the movement of sand parallel to the shore. The development of cavities on the coast, like bays and deltas, can be filled in by this phenomenon, causing the beach to cross into the mainland. Spits are narrow, outgrowths of the beach. A barrier island is formed when a storm, such as a hurricane, cuts inward through the spit.

Beaches formed along the low coastal plains during the last eras when sea levels were lower. Large dune ridges of beach sand were piled up in a shoreward direction. The coastal plains became inundated due to a rise in sea levels caused by the melting ice caps. The crests of the submerged dunes offshore eventually formed the island's heart. The dune ridges were later reshaped and enlarged into a barrier island by wave action and longshore drift.

The coastlines that the aforementioned islands protect are less likely to be damaged/disturbed by waves and storms. Barrier island beaches are not heavily secured, so storm waves can easily crash into them. The side of the land of a barrier island is where most of the action is, even though beaches and dunes tend to get the most attention.

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we learned that an energized conductor will build a magnetic field around it.this field is not same with both ac and dc circuits

A magnetic field is an invisible field that exerts a magnetic force on substances that are sensitive to magnetism. A classic example of one is the field created by an iron magnet; to see how the energy in such a field works, a small magnet can be placed under a piece of paper and iron filings sprinkled on it.

This important relationship between electricity and magnetism is known as electromagnetism, or the magnetic effect of current.

When DC current flows, the magnetic field will act in one direction.

when AC current flow will produce a magnetic field that varies in direction with the direction of the electron current flow.

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An instrument called a profilometer is used to gauge a surface's profile and surface finish.

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The charge for a procedure or accepting fees that are predetermined by the plan is dependent on the patient's ability to pay.

Doctors and surgeons deal with maintaining health as well as diagnosing and treating illnesses and injuries. In addition to conducting physical examinations and medical history inquiries, doctors also order, carry out, and interpret diagnostic tests. Patients frequently receive advice from them on food, cleanliness, and preventative healthcare.

Physician labor is the part of the Medicare Physician Fee Schedule that represents the overhead expenses related to a service.

While precertification gives the provider permission to provide the medical service, preauthorization specifically establishes the dollar amount approved for the medical procedure.

The main distinction between doctors and physicians is that doctors typically specialize in a field of practice while physicians typically have a more general background.

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The population graph of a human population would have an exponential phase followed by a lag phase.

We know that the population has to do with the number of people that can be found in a particular geographical location. Let us note that the population of a place could tend to increase or decerease with time. If the population is increasing with time, then more individuals are added.

It is common to see that the population would undergo a growth phase and then this could be followed by a period in which there is a lag which is shown as a plateau on the graph. This is the general shape of the graph of human population growth.

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The direction of the angular displacement of the wheel is -Toward you.

The definition of angular displacement is "the angle, expressed in radians (degrees, revolutions), through which a point or line has been rotated in a particular sense about a certain axis." It is the angle at which a body travels around in a circle.

A vector quantity, angular velocity has both a magnitude and a direction. The direction matches the direction of the angular displacement, which is where we derived the angular velocity.

The rate at which angular velocity changes over time is referred to as angular acceleration. Typically, it is stated in radians per second per second. As a result, d = d t. The term "rotational acceleration" also applies to the angular acceleration.

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The distance between the poles is 46 m.

Given information indicates that the two towers are 50 meters tall and that the cable is 80 meters long. The midpoint of the cable, designated as h, is 10 meters above the ground.

Let the height be y and the distance from the midpoint to either tower be x. therefore by catenary equation, we get,      

                              y=hcos(x/h)

                            =>50=10cos(x/10)

                  Therefore  5=cosx/10

By the tabulated value from the hyperbolic cosine function, we get the value of

                          cos⁻¹(5)=x/10

                         =>2.3=x/10

                         =>x=23

Therefore the distance between the poles is 2x = 2 x 23 = 46 m.  

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The conservation of momentum in an elastic collision is conserved whereas in an inelastic collision it is conserved but kinetic energy is lost.

When an elastic collision occurs in an isolated system, the total momentum of the object system is conserved. Assuming no net external forces acting on the objects, the momentum of all objects before the collision equals the momentum of all objects after the collision.

An inelastic collision is a type of collision that occurs between two objects in which energy is lost. In an inelastic collision, momentum is conserved, but kinetic energy is not. Most collisions in everyday life are inelastic in nature.

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Given statements are correct according to ignition coil resistance.

Resistance testing could not accurately represent how an ignition coil performs in practice. Testing the current limits and charging rise time of the ignition circuit can be done using current ramping. A coil's state may always be determined by measuring the resistance of the coil. Testing of current ramping is done using a digital storage oscilloscope.

Although most ignition coils' primary resistance should range from 0.4 to 2 ohms, you should check the manufacturer's specifications for the exact value. If the reading is zero, the ignition coil needs to be changed since the primary windings have internally shorted.

The resistance of an ignition coil can always be used to assess its condition.

The actual operating conditions of an ignition coil might not be captured by a resistance test.

Current ramping can be used to test the current limitations and charging rise time of the ignition circuit.

A digital storage oscilloscope is used for the ramping tests that are currently being done.

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We think that it once had huge amounts of water content in its atmosphere.

The Solar System is the gravitationally bound system that includes the Sun and the objects that orbit it. It was formed by the gravitational collapse of a massive interstellar molecular cloud 4.6 billion years ago. The Sun contains the vast majority (99.86%) of the system's mass, with Jupiter holding the majority of the remaining mass. Mercury, Venus, Earth, and Mars are all terrestrial planets made mostly of rock and metal. The four outer system giant planets are significantly larger and more massive than the terrestrials. Jupiter and Saturn are gas giants, composed primarily of hydrogen and helium; Uranus and Neptune are ice giants, composed primarily of volatile substances with relatively high temperatures.

Hence, If Deuterium is more abundant on Venus than elsewhere in the solar system, I think that it once had huge amounts of water content in its atmosphere.

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Distance between nodal planes is calculated to be 2.4m, when given frequency is 125MHz .

A radio transmitter is an electronic circuit that transforms electric power from a power source into a radio frequency alternating current to the antenna and then the antenna radiates the energy from this current as radio waves.

As we know that, F= c/λ

where c -->speed of light and λ --> wavelength

λ = 2L/n

where; L --> length and n -->nodes

Given frequency = 125 MHz

λ = c / F

= 3 * 10⁸/ 125 *10⁶

λ= 2.4

Hence, distance between nodal planes is 2.4m

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There is gravity on the Moon, just not as much as on Earth. So a catapult would be able to throw it's ammunition about six times farther than the same catapult on the Earth.

There may be gravity at the Moon, simply not as much as on the planet. So a catapult could be able to throw it's ammunition about six instances farther than the same catapult on this planet. things do not waft at the Moon. They fall, however they do fall slowly, slower than they do on the earth.

Catapults take advantage of elastic force, regarding stretched, compressed, bent, or twisted cloth. To prepare a catapult to launch a rock, it takes paintings to twist a rope, to stretch a rubber band, or bend wood.

Catapults operate the usage of projectile movement, that is a form of science referred to as Physics. Catapult physics is essentially the usage of stored strength to hurl a projectile. The three primary strength storage mechanisms are tension, torsion, and gravity.

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The static friction force of the pavement on the wheels will not do any work on the skateboard.

Static friction is a variable resisting force that is equal and opposite to the external force until it exceeds the motion threshold when sliding begins.

If the skateboard is rolling at a constant speed without any other forces acting on it, then there is no tendency to slip between the wheel and the surface, so there is no frictional work. Friction will only try to prevent slipping between the 2 surfaces.

On an inclined plane, the wheels will tend to slide down, and if there were no friction, it would again slide between the wheels and the inclined surface. Perhaps friction will always try to counteract the slip, so here it acts upward on the slope to try to prevent the skateboard from sliding down the slope. This has the effect of applying a moment to the skateboard causing it to roll.

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A piece of wood from a nearby construction site floats near the shore of a lake. it floats in very calm water with half of its volume just above the surface. The density of this piece of wood will be 500 kg/[tex]m^{3}[/tex]

The floatation principle states that when an object floats in a liquid, the buoyant force acting on the object is equal to the object's weight.

since ,

buoyant force =  rho * g * V

                        = 1000 * g * (V/2)                   equation 1

objects weight = mg                                   equation 2

equating equation 1 and equation 2

500 * g * V  = mg                                  

mass = 500 V

density = mass / volume = 500 V / V

            = 500 kg/[tex]m^{3}[/tex]

The density of this piece of wood will be 500 kg/[tex]m^{3}[/tex]

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Time taken by the weight to hit the ground is 2.2 seconds when pilot does a run at the same height but twice the speed.

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The change which would increase the mechanical advantage of incisors is an increase in the length of the teeth and no change in the thickness at the widest part of the teeth and is denoted as option D.

They are referred to as a hard structure as a result of it being rich in minerals and is used to chew food so as to increase the surface area for enzymatic action during digestion.

There are different types of teeth such as incisor, molar etc with each having their unique structure and function. Incisors are used to cut food and are located in the middle region of the upper and lower jaw.

The mechanical advantage of incisors will be increased by increasing the length as it helps to bite into the food more and there should be no change in the thickness at the widest part of the teeth as changes could lead to difficulty in the teeth cutting through the substance.

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Each situation should be match with the correct energy transformation as follows:

Energy can be defined as a measure of the ability of a physical body to do work. This ultimately implies that, energy must be possessed or transferred to a physical object or physical body before it can be used in doing a work or heating a system.

The law of conservation of energy states that the energy possessed by a physical body (object) can neither be created nor destroyed, but it can only be transformed from one form to another such as the gravitational potential energy possessed by a child on a slide that is transformed into kinetic energy.

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Complete Question:

Match the situation with the energy transformation.

A boy shooting a rubber band across the classroom

A child going down a slide on a playground

Rubbing your hands together to warm them on a cold day

Turning on a battery operated light

Using a dc electric motor

Using a gas power heater to warm a room

Using a hand crank generator to produce electric current

Using the light in your room that is plugged into the wall

Elastic potential energy transformed into kinetic energy

kinetic energy transformed into electric energy

Gravitational potential energy transformed into kinetic energy

Electrical energy transformed into radiant energy

Chemical potential energy transformed into radiant energy

Electrical energy transformed into kinetic energy

Kinetic energy being transformed into thermal energy

Chemical potential energy transformed into thermal energy

More force is exerted by the table against her finger than she exerts against the surface.

Active power is the force behind motion or change that is exerted or brought to bear. the elements of nature

The term "force" has a clear definition in science. It is quite acceptable to refer to a force of this level as a push or a pull. An object does not "have in it" or "contain" a force. One thing is subject to a force from another. There is no distinction between living and non-living things in the concept of a force.

The newton  is the SI unit of force. As they relate to force, the base units are: The symbol for the length measurement known as the meter is m. The symbol for the kilogram, a unit of mass the sign s represents the second, a unit of time.

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It's true that air resistance is really low. Energy must not be gained or lost during the experiment if they expect to demonstrate that energy is conserved. In other words, there must be little loss from air resistance.

Air is the source of the force known as air resistance. An object travelling through the air experiences the force in the opposite direction. A sports vehicle with a streamlined form will face less air resistance than a lorry with a flat front, enabling the latter to travel faster.

The force of air resistance changes depending on the velocity. This implies that the acceleration is not constant and neither is the force. That is a serious issue.

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