You are pulling a friend on a sled with a constant velocity using a rope held
horizontally in the snow. Using a spring scale attached to the rope, you
measure the tension to be 112 N. The combined mass of the sled and your
friend is 57.4 kg. Write the surface force the ground exerts on the sled in
component form, and determine its magnitude.

The balanced equation of the combustion of propane is

From the above equation, we can say that 1 mole of propane requires 5 moles of oxygen to undergo complete combustion and it produces 3 moles of carbon-di-oxide and 4 moles of water molecules.

Therefore the correct answer is, 'One mole of propane combines with five moles of oxygen to produce four moles of water and three moles of carbon dioxide'.

Bohr's model helped to explain how electrons could only change orbits by exchanging or absorbing energy in fixed quanta.

For instance, if an electron jumps into an orbit that is one orbit closer to the nucleus, it will have to expel energy equal to the energy difference between the two orbits.

A small positively charged nucleus is encircled by rotating negatively charged electrons in set orbits, according to the Bohr Atomic Model.

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A thermal cycler is used in the process of PCR to amplify DNA samples, which can then be used to identify disease pathogens through genetic testing.

PCR, or polymerase chain reaction, is a laboratory technique used to amplify and copy DNA samples. It involves the use of a thermal cycler, which rapidly cycles through different temperatures to facilitate the various steps of the PCR process. The thermal cycler heats and cools the reaction mixture containing the DNA sample and other reagents, causing the DNA to denature, anneal, and elongate in a repeating cycle. Once the DNA has been amplified, it can be used in genetic testing to identify the presence of specific disease pathogens, such as viruses or bacteria, by comparing the amplified DNA sequence to known pathogen sequences.

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The landform that was most affected by erosion and experienced the highest amount of sediment displacement is the riverbed. This is due to the constant flow of water, which exerts a significant force on the riverbed.

Among various landforms, rivers are particularly susceptible to erosion and sediment displacement. The continuous flow of water in rivers exerts hydraulic pressure, which plays a crucial role in erosion. As water moves downstream, it carries sediments and debris along with it. The force of the flowing water can dislodge rocks, soil, and other loose materials from the riverbed, resulting in erosion.

Additionally, the velocity and volume of water in rivers can vary significantly, especially during heavy rainfalls or floods, further increasing the erosive power. This continuous erosion and transport of sediment contribute to the formation and reshaping of river valleys, as well as the deposition of sediment in delta regions and floodplains. Consequently, the riverbed stands out as the landform most affected by erosion and the one with the highest amount of sediment displaced.

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Answer:

The acceleration of an object can be calculated using Newton's second law of motion, which states that the force acting on an object is equal to the mass of the object multiplied by its acceleration. The equation is:

F = ma

where F is the force, m is the mass, and a is the acceleration.

So, if we know the mass of the object (m = 56 kg) and the force acting on it (F = 800 N), we can calculate the acceleration (a) by dividing the force by the mass:

a = F / m

a = 800 N / 56 kg

a = 14.28 m/s^2

So the acceleration is 14.28 m/s^2

Answer:

a. 26.7 cm. b. 11.4 cm.

Explanation:

a. We know h'/h = d'/d where h' = image height = + 2 cm (since it is a real image), h = object height = + 1.5 cm, d' = image distance from mirror and d = object distance from mirror = 20 cm

So, from h'/h = d'/d

d = h'd/h

= 2 cm × 20 cm/1.5 cm

= 40/1.5 cm

=  26.67 cm

≅ 26.7 cm

The position of the image is 26.7 cm from the mirror

b. Using the mirror formula

1/d + 1/d' = 1/f where d = object distance from mirror = + 20 cm, d' = image distance from mirror = + 26.7 cm (its positive since its a real image) and f = focal length of mirror.

So, 1/d + 1/d' = 1/f

⇒ f = dd'/(d + d')

= 20 cm × 26.7 cm/(20 cm + 26.7 cm)

= 534/46.7

= 11.43 cm

≅ 11.4 cm

The focal length of the mirror is 11.4 cm

The correct contact lens prescription in diopters is approximately -27.5 diopters. Note that the negative sign indicates nearsightedness.

To determine the correct contact lens prescription in diopters, we can use the concept of focal length and the lens formula. The lens formula states that the inverse of the focal length of a lens is equal to the sum of the inverse of the object distance and the inverse of the image distance.

Let's denote the object distance as u (0.025m) and the image distance as v (0.280m). The refractive power of the eyeglasses is given as 3.8 diopters.

Using the lens formula, we have:

1/f = 1/v - 1/u,

where f represents the focal length of the lens.

Substituting the given values into the equation, we get:

1/f = 1/0.280 - 1/0.025.

Simplifying the equation further, we find:

1/f = 3.571 - 40.

Now, we can calculate the value of the focal length:

1/f = -36.429.

Taking the reciprocal of both sides of the equation, we obtain:

f = -1/36.429.

Finally, the contact lens prescription, which represents the refractive power, is the inverse of the focal length. Therefore, the correct contact lens prescription in diopters is approximately -27.5 diopters. Note that the negative sign indicates nearsightedness.

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Complete question:

A nearsighted man uses eyeglasses with a refractive power of 3.8 diopters. wearing the glasses 0.025m from his eyes, he is able to read books held no closer than 0.280 m from his eyes. he would like a prescription for contact lenses to serve the same purpose. what is the correct contact lens prescription in diopters?

If the coefficient of friction is.2, the frictional force is 100 N.

The resistive force of friction (Fr) divided by the normal or perpendicular force (N) pushing the objects together yields the coefficient of friction (fr), which is a numerical value. The formula fr = Fr/N serves as a representation of it.

F = N is the equation for frictional force. Let's use the 2-kg block of wood that is resting on a table to be pushed from rest as an example. The static friction coefficient is taken into account in this situation. The static coefficient of wood is 0.5.

F = μN

F = 2 × 100 ×cos60°

F = 200 × 1/2

F = 100 N

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The density of a cube that has a mass of 12. 6 and a measured  length of  4.1 cm is 0.18 kg/cm³

Density=mass/volume

mass=12.6

volume=68.9

density=12.6/68.9

density=0.18 kg/cm³

Density is defined as a material substance's mass per unit volume. Density is described by the equation d = M/V, where d stands for density, M for mass, and V for volume. Grams per cubic centimeter is the unit of measurement for density. For instance, compared to Earth's density of 5.51 grams, water has a density of 1 grams per cubic centimeter . Another way to express density is in kilograms per cubic meter (in meter-kilogram-second or SI units), It is easy to determine the relationship between mass and volume using density. For instance, the formula for determining a body's mass is M = Vd, while the formula for determining a body's volume is V = M/d.

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The answer is speed.

When a simple harmonic oscillator is at its maximum displacement from the equilibrium position, its speed is at its minimum. This is because the oscillator is momentarily changing direction at this point, coming to a stop before moving back towards the equilibrium position.

To further explain, a simple harmonic oscillator follows a sinusoidal motion, such as a pendulum or a mass-spring system. At the maximum displacement, the restoring force (which acts opposite to the displacement) is at its greatest, causing the magnitude of acceleration to be at its maximum. However, this force causes the object to decelerate, eventually bringing its speed to a minimum at the maximum displacement point.

It is important to note that the frequency, potential energy, and period remain constant throughout the motion. The frequency and period are intrinsic properties of the oscillator and do not change with the displacement. The potential energy is at its maximum at the maximum displacement, as the kinetic energy is at its minimum (since the speed is at its minimum).

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"The diode model which includes the large reverse resistance is the complete model."

The barrier potential, the modest forward dynamic resistance, and the huge internal reverse resistance make up the entire concept of a diode. Because it provides a pathway for the reverse current, which is taken into account in this diode model, the reverse resistance is taken into consideration.

The complete diode model is the most accurate approximation and includes the barrier potential, the small forward dynamic resistance and the large internal reverse resistance.

The diode functions as a closed switch when it is forward-biased.

In parallel with the substantial internal reverse resistance, the diode functions as an open switch when it is reverse-biased.

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the energy possessed by a body by virtue of its position relative to others, stresses within itself, electric charge, and other factors.

A book on a table before it falls.

A child at the top of a slide.

Ripe fruit before it falls.

River water at the top of a waterfall.

Answer:

the momentum would be 8629.6kgm/s

Explanation:

mass = 322kg

velocity = 26.8m/s

the formula for momentum is

p = m × v

by substituting into the formula

p = 322kg × 26.8m/s

p = 8629.6kgm/s

Answer:

The answer to this question is given below in this explanation section.

Explanation:

              " the magnitude of the electrical force between two protons"

The electric force between two object is proportional to the inverse square of the object between two objects.The electric force between two electrons is the same as the electric force between two protons when they are placed as the same distance.This implies that the electric force does no depend on the mass    of the particle instead it depend on the new quantity:the electric charge.The unit of electric charge Q is the coulomb.The unit of electric charge q is the coulomb.The electric charge can be negative ,zero or positive.The electric charge on a glass rod rubbed with silk is positive.The electric charge of the electron proton and neutron are magnitude of the charge of the protons  is exactly equal to the magnitude of the charge of the electrons.The number of electrons must be equal to the number of protons.The prices magnitude of the electric force that a charged particle exerts on another is given by coulomb's law.

The magnitude of the electric force that a particular exerts on another particle is directly proportional to the product of their change and inversely proportional the square of the distance between them.

A key contribution of Hermann von Helmholtz to the study of neuron function was measuring the conduction speed through nerves of the action potential.

Helmholtz created a technique known as the "method of the nerve impulse" to gauge the rate of nerve conduction. He performed tests in which he stimulated a nerve at one end and timed the passage of an action potential to the other end of the nerve.

Helmholtz determined the speed of the nerve impulse by meticulously measuring these time gaps. His research and observations shed important new light on how signals move through the neurological system.

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According to Wien's law, the color of the sun should be a bright white or slightly bluish-white. This is because Wien's law states that the peak wavelength of the sun's radiation is in the ultraviolet region, which corresponds to a color on the blue end of the visible spectrum.

However, since the sun emits radiation across a broad range of wavelengths, it appears as a bright white ball in the sky to the human eye.

Based on Wien's Law, the Sun's color is primarily white. Wien's Law helps determine the peak wavelength of radiation emitted by a black body, such as the Sun, based on its temperature. The Sun's surface temperature is around 5,500°C (9,932°F), which corresponds to a peak wavelength in the visible light spectrum, causing it to appear white to the human eye.

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Answer:

the reason I ask is that you are not even going to be a little late to the party but

Answer:

15 m/s

Explanation:

150m ÷ 10s = 15m/s

Answer:

C

Explanation:

Fusion and fission are similar in that they both release large amounts of energy. Nuclear fusion is a process in which two nuclei join to form a larger nucleus. Nuclear fission is a process in which a nucleus splits into two smaller nuclei.

When the spring is stretched by 15.2 cm = 0.152 m, the spring exerts a restorative force with magnitude (due to Hooke's law)

\(F = kx\)

where \(k\) is the spring constant. Solve for \(k\).

\(49.1\,\mathrm N = k (0.152\,\mathrm m) \implies k \approx 323 \dfrac{\rm N}{\rm m}\)

The amount of work required to stretch or compress a spring by \(x\,\mathrm m\) from equilibrium length is

\(W = \dfrac12 kx^2\)

Then the work needed to stretch the spring by 15.2 cm is

\(W_1 = \dfrac12 \left(343\dfrac{\rm N}{\rm m}\right) (0.152\,\mathrm m)^2 \approx 3.73\,\mathrm J\)

and by 15.2 + 13.7 = 28.9 cm is

\(W_2 = \dfrac12 \left(343\dfrac{\rm N}{\rm m}\right) (0.289\,\mathrm m)^2 \approx 13.5\,\mathrm J\)

so the work needed to stretch from 15.2 cm to 28.9 cm from equilibrium is

\(\Delta W = W_2 - W_1 \approx \boxed{9.76\,\mathrm J}\)

Satellites have made ground-based weather stations almost obsolete is false.

While satellites have greatly enhanced weather monitoring and forecasting capabilities, ground-based weather stations still play a crucial role in collecting detailed and localized weather data. Ground-based weather stations provide valuable information such as temperature, humidity, wind speed, precipitation, and atmospheric pressure at specific locations. This data helps validate and calibrate satellite observations and provides essential information for accurate weather predictions and climate studies. Ground-based weather stations also contribute to monitoring and understanding local weather patterns, microclimates, and phenomena that may not be captured by satellite imagery alone. Therefore, satellites and ground-based weather stations work in tandem to provide comprehensive and reliable weather information.

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When two cars collide inelastically on a city street, the following properties are the same in any inertial reference frame:

(a) The kinetic energy is not conserved in inelastic collisions, so it will not be the same in any inertial reference frame.

(b) The momentum of the two-car system will be conserved and remain the same in any inertial reference frame.

(c) The amount of energy dissipated in an inelastic collision is not the same in all inertial reference frames, as kinetic energy is not conserved.

(d) The momentum exchanged during the collision will also be the same in any inertial reference frame, as the total momentum is conserved.

So, the properties that are the same in any inertial reference frame are the momentum (b) and the momentum exchanged (d).

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Answer:0

Explanation:

because it ran out when it hit the ground

Answer:

A free body diagram with 2 forces: the first pointing downward labeled F Subscript g Baseline 20 N and the second pointing upward labeled F Subscript air Baseline 20 N.

Explanation:

This is because at terminal velocity, the ball stops accelerating and the net force on the ball is zero. For the net force to be zero, equal and opposite forces must act on the ball, so that their resultant force is zero. That is F₁ + F₂ = 0 ⇒ F₁ = -F₂

Since F₁ = 20 N, then F₂ = -F₁ = -20 N

So, if F₁ points upwards since it is positive, then F₂ points downwards since it is negative.

So, a free body diagram with 2 forces: the first pointing downward labeled F Subscript g Baseline 20 N and the second pointing upward labeled F Subscript air Baseline 20 N best describes the ball falling at terminal velocity.

Answer:

b

Explanation:

Answer: 3A, current flowing through the circuit is 3A

Explanation: we know that the voltage given in the figure is 120V

Formula applied - I=V/R

resistors are connected in SERIES

R1= 10

R2= 5

R3= 25

R1+R2+R3=40

I=120/40 =3A

Hence current flowing is 3A

Calculation of the density of the material from which the sphere is madeThe buoyancy force, F = ρgV, where V is the volume of fluid displaced by the object. Since 90% of the volume of the sphere is below the surface of the water,

The buoyant force is given by;F = ρwater g Vpwhere Vp is the volume of the portion of the sphere below the surface of the water;The mass of the sphere is given by;M = ρair Vwhere V is the total volume of the sphereDensity of the material from which the sphere is made, ρ, can be determined as follows;F = (Mg - ρgV) = (M - ρV)g90% of the volume of the sphere is below the surface of the water, thus Vp=0.9V

Therefore, F = ρwater g 0.9V

= (ρair V - ρV)g0.9ρwater

= (ρair - ρ)ρ

= ρair - (0.9ρwater/ρ)ρ

= ρair/(1 + 0.9ρwater/ρ) the density of the material from which the sphere is made is ρ

= 727 kg/m³

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Answer:

1 gm/cm^3

Explanation:

Bouyancy is equal to the amount of fluid displaced by the object times the density of the fluid ...

I will assume this object is floating in the fluid

  80% of the volume of the object = volume of fluid * density of fuid

      imagine a 100 cm^3 object:

              100 * .8 gm/cm^3  = 80 * density of fluid

                density of fluid =   100* .8 / 80 = 1 gm/ cm^3    ( like water)

Heat of fusion latent The latent fusion temperature of a specific solid is the quantity of heat energy needed to transform 1 kilogram of solid into liquids at that solid's melting point.

Energy must be added to overcome the forces holding the particles together in order to transform a solid into a liquid and just a liquid into a gas. The strength of the connections binding the particles together determines how much energy is needed to change their state.

Either Celsius degrees or Kelvin degrees might be used to indicate this. The formula for the quantity Q=mL Q=m L, where m represents the mass of the item and L is the latent fusion temperature for an opening or vaporization, determines the amount of heat necessary to change a material's phase.

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