stephanie pulls on a rope that is attached to a large crate. she is pulling the crate along at a constant speed as it slides across rough carpet. how does the magnitude of the force of tension exerted on stephanie compare to the magnitude of the force of tension exerted on the crate?

Answers

Answer 1

The force  of  tension exerted on the crate has the same magnitude as the force of tension exerted on Stephanie.

What is force ?

a force is an influence that can change the motion of an object. A force can cause an object with mass to change its velocity, i.e., to accelerate. Force can also be described intuitively as a push or a pull. A force has both magnitude and direction, making it a vector quantity.

The rope pulls with equal magnitude force but in opposite directions to the hand and to the mass (neglecting the weight of the rope). This is an example of Newton's third law. The rope is the medium that transmits forces of equal magnitude between the two objects but that act in opposite directions.

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Related Questions

in a series circuit with three bulbs, adding another bulb will a. make the nearest bulb brighter. b. make some of the bulbs dimmer. c. make all the bulbs brighter. d. make all the bulbs dimmer. please select the best answer from the choices provided a b c d

Answers

The addition of a fourth bulb will cause some of the three lights in a series circuit to become dim.

What does an electrical bulb do?

A wire filament is used in an electronic bulb, a compact and basic light source that emits light when power is applied. The illustration below shows the incandescent light bulb's construction. Three essential components make up the light bulb. the thread. glass lightbulb

Is a light a bulb?

An electrical device that generates light is known as an electric light, lamp, or lightbulb. The most prevalent type of artificial illumination is this. A lamp's base, which is often composed of ceramic, metal, glass, or plastic, attaches it in the socket of such a lighting system, which is also frequently referred to as a "lamp."

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Which states of matter are required for energy transfer to occur when radiant energy is the source?.

Answers

No state of matter is required for energy transfer to occur when radiant energy is the source.

Which states of matter are required for energy transfer when radiant energy is the source?

When radiant energy is the source,  it means we are talking about energy transfer by radiation, so matter is not needed for the energy to be transferred.

An example of this is the Sun as it heats up the Earth by radiation, even through the vacuum of outer space, where there is almost no matter.

Radiant energy is used for radiant heating that can be generated electrically by infrared lamps, or can be absorbed from sunlight and is used to heat water.

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what do we mean by the halo of a galaxy? (a) it is the central region that is crowded with stars. (b) it is a large, roughly spherical region surrounding the disk. (c) it is the pancake-shaped region in which spiral arms are found.

Answers

A galaxy's halo is a large, generally spherical area that surrounds the disk.

Solution b is accurate.

What is Halo Galaxy?

An extended, approximately spherical component of a galaxy that extends beyond the primary, visible component is called a galactic halo. The halo is made up of several distinctive galaxy parts, including: the halo of a star. a galaxy's corona (hot gas, i.e. a plasma)

The term "halo" refers to a ring of light that seems to surround the sun or moon and is caused by the refraction or reflection of light by atmospheric ice particles.

Globular clusters and other aging stars can be found in the galactic halo, a region of the galaxy that extends far above and below the galactic disk. - Roughly round; somewhat flattened. - Only includes old stars. - is free of gas and dust.

Thus halo galaxy is a large, roughly spherical region surrounding the disk (option B is correct)

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a stuntman is being pulled along a rough road at a constant velocity, by a cable attached to a moving truck. the cable is parallel to the ground. the mass of the stuntman is 109 kg, and the coefficient of kinetic friction between the road and him is 0.870. find the tension in the cable.pdf

Answers

The tension in the cable is 929.334 N.

Solution:

The net force in the horizontal direction is T - F = 0.

Resolving vertically,

N = mg

The relationship between friction and reaction force is

[tex]F = \mu_{k}N[/tex]

[tex]T - \mu_{k} N = 0[/tex]

[tex]T = \mu_{k} mg[/tex]

= [tex](0.870)(109 kg) \times 9.8 \frac{m}{s^{2}}=(0.870)(109kg)[/tex] x 9.8ms²

N = 929.334N.

Tension refers to the force transmitted when a cable, rope, wire, or cord is knotted by forces acting on both ends. The cord is unidirectional along its length and pulls the object evenly at both ends of the cord. As lift increases, the total stress equals the sum of weight and force due to acceleration. As the lift is lowered, the total stress equals the difference in weight and force due to acceleration.

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1. (10 points) when ashley sat on a rotating stool holding a set of weights close to her body, her rate of rotation changed when she moved the weights away from her body. did her rate or rotation slow down or speed up? why did this occur? did this violate the conservation of energy?

Answers

Moment of inertia decreases. due to friction effects associated with the tides driven by the Moon.

Conservation of energy Physics. a fundamental regulation of physics and chemistry stating that the whole power of an isolated system is steady despite inner modifications. it's far most normally expressed as electricity can neither be created nor destroyed and is the basis of the first law of thermodynamics.

According to the regulation of conservation of electricity, electricity can not be created or destroyed. it is able to, however, be converted from one shape to some other. whilst all kinds of strength are considered, the full strength of an isolated gadget stays consistent.

The longer we pass without making enormous adjustments, the greater the risk of world warming and climate exchange come to be in our everyday lives. whilst we burn fossil fuels, they devise an awesome amount of greenhouse gas emissions.

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a flat, circular loop has 17 turns. the radius of the loop is 11.0 cm and the current through the wire is 0.58 a. determine the magnitude of the magnetic field at the center of the loop (in t).

Answers

The magnitude of the magnetic field at the center of the loop 6.28  × 10⁻⁵ T.

A magnetic field is a vector subject that describes the magnetic effect on moving electric charges, electric currents, and magnetic materials. A transferring price in a magnetic area stories a pressure perpendicular to its very own pace and to the magnetic discipline.

calculation:-

Given;

Number of turns n  = 17 turns

radius = 11 cm = 0.11m

current i = 0.58 A

Magnetic field at the centre of the loop is

B = μ₀nI//2r

B = 4π × 10⁻⁷ × 17 × 0.58 / 2× 0.11

  = 628.4 × 10⁻⁷ T

   = 6.28  × 10⁻⁵ T

A magnetic field is a vector field that describes the magnetic influence on moving electric charges, electric-powered currents, and magnetic substances. A transferring rate in a magnetic field story a pressure perpendicular to its own velocity and to the magnetic area.

The magnetic field is the place around a magnet wherein the impact of magnetism is felt. We use the magnetic discipline as a tool to explain how the magnetic force is shipped in the area around and inside something magnetic in nature.

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Sam, whose mass is 75 kg, straps on his skis and starts down a 50-m-high, 20 ^\circ frictionless slope. A strong headwind exerts a horizontal force of 200 N on him as he skies.
a)Find Sam's speed at the bottom using work and energy.
b)Find Sam's speed at the bottom using Newton's laws.

Answers

At the base of the incline, Sam is moving at a speed of 15.73 m/s. who weighs 75 kg puts on his skis and begins to descend a 50 m-high, 20 frictionless slope.

Sam's bottom-of-the-screen speed is determined using the Work-Energy Theorem as follows: An object moves parallel to the plane on a slope with no friction. Both the normal force and the gravitational perpendicular component cancel each other out because they are acting in the same speed. Therefore, an object on a frictionless slope is solely accelerated by the gravitational parallel component. On a surface on an inclined plane with no friction, any item accelerates.

delta W is equal to the delta kinetic energy for frictionless slope

(36750 - 27472) = 1/2*75*(v2 -0).

9278=37.5(v^2)

v^2 = 9278/37.5(v2)

v^2 = 247.4v = 15.73 m/s

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in the proton-proton chain, the mass of four protons is slightly greater than the mass of a helium nucleus. explain what happens to this "lost" mass.

Answers

The lost mass or mass defect that results in the mass of four protons being slightly greater than the mass of a helium nucleus is due to the conversion of matter to energy.

What is the lost mass in a nucleus of atoms?

The lost mass or the mass defect is the difference in mass that is observed when the mass atoms of elements are compared to the sum of the mass of the constituents of all the particles in the nucleus of the atom.

For example, the mass of four protons is slightly greater than the mass of a helium nucleus that is also composed of four protons.

This loss in mass is known as the mass defect.

The loss in mass or mass defect is a result of the conversion of some of the mass of the particles to energy.

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a beam positioned on a fulcrum is 6 m long. it has a weight of 300 n attached to one end and a weight of 250 n attached to the other end. to establish mechanical equilibrium, the fulcrum must be placed how far away from the 250 n weight? (answer in m)

Answers

To establish mechanical equilibrium, the fulcrum must be placed 3.27 m away from the 250 N weight.

What is the position of the fulcrum?

The position of the fulcrum from the 250 N weight is determined by applying the principle of moment as shown below.

let the position of the fulcrum = d

The position of the 250 N from the fulcrum must be greater than the center of the beam since 300 N is heavier than 250 N.

----------------------------------Δ--------------------------------

↓                                     d                                      ↓

250 N                                                                    300 N    

the position of the 250 N weight from the fulcrum = d

the position of the 300 N weight from the fulcrum = 6 m - d

take moment about the pivot;

sum of the antic lock wise moment = sum of the clockwise moment

250 ( d ) = 300 ( 6 - d )

250d = 1,800 - 300d

550d = 1,800

d = 1,800 / 550

d = 3.27 m                              

Thus, the position of the fulcrum from 250 N depends on the length of the beam and the weight hanging at the other end.

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go to the exploring waves discussion and post an answer to this question: waves are used in many practical applications to support work, entertainment, and health. one example is the use of ultrasound imaging to safely track the development of a growing fetus. what is a specific example of a practical application of waves in medicine, entertainment, safety, or other fields? provide a brief explanation of how the properties of waves are useful to that application. in your explanation, make sure you use at least four of the terms about waves introduced in this lesson. respond to at least one other person and explain why you agree or disagree with their comment. make a copy of your discussion post and response, and paste these items into 06.02 exploring waves discussion assessment.

Answers

A specific example of a practical application of waves in medicine is the capturing of body structures to detect abnormalities in them.

Abnormality is the giant deviation from normally usual patterns of conduct, emotion, or notion, same time as normality is the absence of illness and the presence of a country of nicely being otherwise referred to as normalcy. It may be hard to attract the line between regular and strange behaviors, specifically in management.

Abnormality consists of 3 extraordinary classes; they're subnormal, supernormal, and paranormal. The technology of unusual psychology studies two types of behaviors: adaptive and maladaptive behaviors.

Apart from genes, similarly, organic elements that contribute effectively to the abnormality of 1's behavior are neurotransmitters and hormones. Imbalance in neurotransmitters like GABA, norepinephrine, and many others., causes unusual neural plasticity or mental dysfunction.

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A block of iron has the dimensions of 3. 00 cm x 3. 00 cm x 3. 00 cm. It has a mass of 213 g. When placed in water, the block sinks. What volume of water did it displace? 213 cm 3 0. 127 cm 3 7. 89 cm 3 27. 0 cm 3.

Answers

When the block  of iron is  placed  in water  the volume of water that   is  displaced is 27.0  cm³

Hence, Option D is correct.

Explain in detail.

The  volume water that is displaced is equal to volume of block  of the ironvolume of block of iron = length x width x height   length= 3 cm   width = 3  cm height = 3 cm

therefore the volume displaced = 27 cm³  since the volume of water displaced  is equal to  volume of block.

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Shown below are the four terrestrial planets of our solar system. Assume that all the planets started out equally hot inside. Rank the planets based on their expected cooling rates, from fastest cooling to slowest cooling.MercuryMarsVenusEarth

Answers

The rank of the terrestrial planets based on their expected cooling rates, from fastest cooling to slowest cooling is as follows -

mercury , Mars, Venus, Earth

Mercury - It is the smallest terrestrial planet in the solar system. It has a thin atmosphere, which causes it to swing between burning and freezing temperatures.

Mars - It is less dense than Earth and has a smaller magnetic field, which is a indication of a solid core rather than a liquid one. Mars is known to have water ice and organics- some of the ingredients for living things.

Venus - It is about the same size as Earth and has a thick, toxic carbon-monoxide (CO) dominated atmosphere that traps heat, making it the hottest planet in the solar system.

Earth - Out of the four terrestrial planets, Earth is the largest and has regular seasons for much of it surface; regions closer to the equator tend to stay warm, while spots closer to the poles are cooler and in the winter, icy.

Therefore, the cooling rate of terrestrial planets is Mars, Earth, Venus, Mercury

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an uncharged capacitor and a resistor are connected in series to a source of emf. if e 5 9.00 v, c 5 20.0 mf, and r 5 100 v, find (a) the time constant of the circuit, (b) the maximum charge on the capacitor, and (c) the charge on the capacitor at a time equal to one time constant after the battery is connected.

Answers

a)The time constant of the circuit is  2sec.

b)The maximum charge on the capacitor is 0.18C

c)The charge on the capacitor at one time constant is 0.18×(1-(1/[tex]e^\frac{t}{500}[/tex]).

a)We have resistor resistance 100ohm,capacitor capacitance as 20mf and EMF value as 9V.

We know very well that the time constant of the circuit is defined as the product of Resistance and Capacitance, or in other words

τ=R×C

Therefore,τ=100ohm×20×10⁻³F

            =>τ=2sec.

b)The maximum charge on the capacitor is defined as the product of capacitance and voltage applied by the battery.

In other words, Q=C×E

                      =>Q=20×10⁻³F×9V

                       =>Q= 180×10⁻³C

                        =>Q=0.18C

c)Now,we need to find the charge on the capacitor at one constant time.We know very well that charge on the capacitor at any given time is represented by

q(t)=q₀(1−1 /[tex]e\frac{t}{RC}[/tex])

where q₀ is the maximum charge induced on the capacitor

Therefore, q(t)=0.18×(1-(1/[tex]e^\frac{t}{100.5}[/tex])

=>q(t)=0.18×(1-(1/[tex]e^\frac{t}{500}[/tex])

Hence, a)time constant is 2sec,b)maximum charge is 0.18C and c)charge at one time constant on capacitor is q(t)=0.18×(1-(1/[tex]e^\frac{t}{500}[/tex]).

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a particle of mass 0.195 ???? carries a charge of −2.50×10ି଼ ????. the particle is given an initial horizontal velocity that is due north and has a magnitude of 4.00×10ସ ௠ ௦. what are the magnitude and direction of the minimum magnetic field that will keep the particle moving in the earth’s gravitational field in the same horizontal, northward direction?

Answers

The magnitude and direction of the minimum magnetic field that will keep the particle moving in the earth’s gravitational field in the same horizontal, northward direction is 1.911 Tesla.

Velocity v = 4×[tex]10^{4}[/tex]

Charge q = 2.5 × [tex]10^{-8}[/tex]

Mass of particle m= 0.195 g = 0.195 × [tex]10^{-3}[/tex] kg

Using the concept of Lorentz force

mg=Bvq

B = mg/vq

Substituting the values

B= 0.195 × [tex]10^{-3}[/tex] × 9.8/4×[tex]10^{4}[/tex]×2.5×[tex]10^{-8}[/tex]

B= 1.911 Tesla

Therefore, To produce upward force, using right hand value and taking particle in negative charge then the magnetic field has to be point in eastwards.

What is gravitational field?

In physics, a gravitational field is a model used to describe the effect of one massive object spreading out in space around it and creating a force on another massive object. Gravitational fields are used to describe gravitational phenomena and are measured in Newtons per kilogram.

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a ferris wheel starts from rest and builds up to a final angular speed of 1.9 rad/s while rotating through an angular displacement of 4.9 rad. what is its average angular acceleration?

Answers

The average angular acceleration of Ferris wheel is 0.368m/s².

According to their position on the Ferris wheel, riders will feel "heavier" or "lighter" depending on the physics of the Ferris wheel, which is directly related to centripetal acceleration.The passenger gondolas (seats) for the ferris wheel are attached to the rim of an upright wheel. At the support where they are connected to the Ferris wheel, these gondolas can freely pivot. As a result, while the Ferris wheel is spinning, the gondolas always hang downward.

ω=1.9rad/s

α=4.9rad

To find angular acceleration.

[tex]w^2=2\alpha s[/tex]

To find α:-

[tex]\alpha =\frac{w^2}{2s}[/tex]

=1.9 x 1.9/9.8

=0.368m/s²

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a grating with 532 lines/mm is illuminated with light of wavelength 565 nm. what is the angular separation between the two lines formed in order m

Answers

The angular separation is 77.8°.

What is angular separation?

It is the angle between two point objects or sightlines, as seen from an observer. It is denoted by θ.

What is bragg's law?

Bragg's law states that "The reflected x-ray beam has the same angle of scattering as the incident beam when an x-ray beam strikes a crystal at an angle. When the path difference (d) is equal to the wavelength's whole number (n), constructive interference will result."

nλ = 2d sin θ

Separation of 532 lines = 1 mm, so the slit separation is,

d= 1 / 532 mm

=[tex](1.8 * 10^-^3mm) (\frac{10^-^3m}{1 mm)}[/tex] = [tex]1.8 * 10^-^6[/tex] m

The Bragg's equation is,

d sinθ = nλ

Rewrite the Bragg's equation for θ

θ = [tex]sin^-^1[/tex] [mλ / d ]

Thus, the angle of diffraction is,

θ = [tex]sin^-^1 [\frac{2(565 * 10^-^9) }{1.8 * 10^-^6}][/tex]

= 38.89°

Angular separation = 2θ

=2(38.89)°

= 77.78°

≅ 77.8°

The angular separation is 77.8°.

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Nuclear decay occurs according to first-order kinetics. What is the half-life of polonium-218 if a sample decays from 55. 4 g to 31. 7 g in 2. 50 minutes?.

Answers

The half-life of polonium-218 if a sample decays from 55. 4 g to 31. 7 g in 2. 50 minutes is 3.5 minutes.

Rate of first order reaction is given by:[tex]kt = 2.303 * log(R'/R)[/tex]

Where , k = rate of reaction

             t= time = 2.5 minutes

             R= final amount = 31.7g

             R'= initial amount = 55.4g

Putting these values in above equation we get k = 0.22

Now half life of a first order reaction is given by: 0.693/k

Putting k= 0.22 , we get half life = 3.5 minutes.

So the half-life of polonium-218 if a sample decays from 55. 4 g to 31. 7 g in 2. 50 minutes is 3.5 minutes.

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two inductors of self-inductance l1 and l2 are connected in parallel. the inductors are magnetically shielded from one another so that neither produces flux in the other. show that the self-inductance of the combination is given by 1 l

Answers

Voltage is proportional to inductance just as, for resistors, it is proportional to resistance. Now, the (independent) voltages for parallel elements are equal (V₁ = V₂) and the currents (which are generally functions of time) add i(t) = i₁(t) + i₂(t)

This leads to the equation,

i = i₁ + i₂ + i₃ = V [(1/R₁) + (1/R₂) + (1/R₃)] for resistors.

We note that this condition on the currents implies

d₁(t)/dt + d₂(t)/dt = d(it)/dt

Thus, although the inductance equation, ε = -L(di/dt) involves the rate of change of current, as opposed to current itself, the conditions that led to the parallel resistor formula also apply to inductors.

Therefore, 1/L(eq) = 1/L₁ + 1/L₂

Therefore to ensure the independence of the voltage values, it is important that the inductors not be too close together. The requirement is that the field of one inductor not to have significant influence (or "coupling") in the next.

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what is the minimum coefficient of friction between the tires and the road that the car could have and still make the turn?

Answers

The minimum coefficient of friction between the tires and the road that the car could have and still make the turn is 0.7 for dry roads and 0.4 for wet roads.

The value of minimum coefficient of friction is usually between 0 and 1 but can be greater than one. A value of zero means there is no friction between the objects such is possible with a lubricant material . All objects, should have friction between them when they come in contact with each other.

The coefficient of friction is as low as 0.05 between dry sliding surfaces will be achieved when the mechanical interconnections are removed. This outcome has been attained based on a theoretical model of an ideal surface for low friction.

The coefficient of friction having value 1 is a perfect positive correlation. A coefficient of correlation zero means there is no linear relationship. Correlation coefficients are used in science to assess the degree of association between two variables, factors, or data sets.

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Air in an ideal Diesel cycle is compressed from 4 L to 0.25 L, and then it expands during the constant pressure heat addition process to 0.50 L. Under cold air standard conditions, determine the thermal efficiency of this cycle.

Answers

Air in an ideal Diesel cycle is compressed from 4 L to 0.25 L, and then it expands during the constant pressure heat addition process to 0.50 L. Under cold air standard conditions, the thermal efficiency of this cycle is 65.2%.

For an air standard engine with γ = 1.4, compression ratio r and fuel cut off ratio rc where r = V1/V2

and rc = V3/V2 and V1 = 4l, V2 = 0.25l and V3 = 0.50l

The efficiency (n) of diesel cycle is ----

n = 1 - [1 / r^(γ - 1)] * (rc^γ -1) / γ(rc - 1)

n = 1 - [1/(4/0.25)^(1.4-1)] * (0.50/0.25)^1.4 - 1 / 1.4 [(0.50/0.25) -1 ]

n = 1 - [1/3.03] * [2.63 - 1] / 1.4x1

n = 0.652

n% = 65.2%

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when testing the strength of grade a cotton fabric covering an aircraft that requires only intermediate grade, the minimum acceptable strength the fabric must have is

Answers

B- 70 percent of the original strength for intermediate fabric.

What is  Fabric covering?

Fabrics are adaptable and employed in a wide range of industries, including clothing, agriculture, the military, and obviously the healthcare sector. More than you would imagine, specialty textiles are a part of our daily life. These textiles are generally flame resistant, mould and mildew resistant, and particularly treated with antibacterial properties for the healthcare sector. Why, I presume you ask? Because textiles used often in the medical field need to be antimicrobial and stain resistant from the start, this will help prevent bacteria from growing on the fabric surface.

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the holding force in drawing is most likely to be (a) greater than, (b) equal to, or (c) less than the maximum drawing force?

Answers

In drawing, the holding force is most likely to be lower than the maximal drawing force.

Explain about the drawing force?

By using a special method called FORCE Drawing, you can learn to see things more clearly and to comprehend what you are looking at. This will help you to draw from life and from your imagination with great talent and understanding.

All forces operating on an item, their direction, and their magnitude are represented in a force diagram. The image has been streamlined to only depict the forces.

The term "force diagram," sometimes known as a free body diagram, refers to a sketch in which all force vectors acting on an object are shown with their initial points at the location of the object.

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As you watch the video, notice that the size of the tidal bulges varies with the Moon's phase, which depends on its orbital position relative to the Sun. Which of the following statements accurately describes this variation?
Low tides are lowest at both full moon and new moon.
Low tides are highest at both full moon and new moon.
High tides are highest at full moon and lowest at new moon.
Low tides are highest at full moon and lowest at new moon.
High tides are highest at both full moon and new moon.
High tides are highest at first- and third-quarter moon.

Answers

The two statements that accurately describes this variation are that low tides are lowest at both full moon and new moon, high tides are highest at both full moon and new moon.

What is the reason for this?

As the video shows, the tidal minima are smallest and the tidal bulges are largest at full moon and new moon, because those times when tidal forces due to the Sun and Moon get aligned (and therefore add to one another).

So, high tides are higher and low tides are lower at these times, and these are called spring tides. (In contrast, we have neap tides at first- and also third-quarter moons, when high tides are not as high and low tides are not as low as usual.)

Therefore, the two statements that accurately describes this variation are that low tides are lowest at both full moon and new moon, high tides are highest at both full moon and new moon are .

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jupiter nudges the asteroids through the influence of (a) tidal forces. (b) orbital resonances. (c) magnetic fields.

Answers

The asteroids are moved by Jupiter under the influence of (b) orbital resonances.

What are asteroids ?

Small, stony objects called asteroids orbit the Sun. Asteroids, sometimes known as minor planets, are rocky, airless debris from the early stages of the solar system's creation, which occurred around 4.6 billion years ago.

When two satellites' orbital periods are related by integer relationships, they can exert gravitational pull on one another and change the eccentricity of their orbits, resulting in an orbital resonance. Io, Europa, and Ganymede are the three inner moons of planet Jupiter. They are locked in a 4:2:1 orbital resonance, which means they are playing the same note in different octaves. The tones that Callisto and Ganymede produce are almost an octave and a minor third apart because they are almost in a 12:5 resonance.

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click to turn on the electric field. there is something interesting about the direction of electric field between the plates. why do you think that this situation appears in so many physics problems?

Answers

This situation appears in physics problems because of the negative charge, an inward-facing radial electric field is produced.

However, due to E=F/Q (here, Q is negative, so) there is another negative charge, which experiences a force in the direction radially opposite the first negative charge.As a result, force would be moving in the opposite direction from the field, which is directed towards the negative charge.However, in actuality, atoms would lose their electrons in order to generate a positive charge. The protons would be more numerous than the electrons, giving it a positive charge.Because a test particle would be subjected to two forces acting in opposite directions at the point of intersection, field lines produced by a single charge do not intersect.

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a solid cylinder with a mass of 5 kg and a radius of 30 cm is rolling on a flat surface. the cylinder rolls with a speed of 2 m/s. what its kinetic energy?

Answers

The total kinetic energy of a cylinder is 15 J.

Given that, mass = 5 kg

Radius of the cylinder= 30 cm = 30/100 m = 0.3 m

Speed = 2 m/s

Ut = Uk + Ur

where, Uk - translation kinetic energy

Ur - rotational kinetic energy

I is the moment of inertia of the solid cylinder

⇒ 1/2 mv² + 1/2 Iω²

⇒ 1/2 mv² + 1/2 [1/2 m r² * (v/r)²]

⇒ 1/2* 5 * (2)² + 1/2 [1/2* 5 *(0.3)² * (2/0.3)²]

⇒ 10 + 1/2*1/2*5* (0.3)²* 4 / (0.3)²

⇒ 10 + 5 = 15 J

Thus, the total kinetic energy is 15 J.

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speedboat a negotiates a curve whose radius is 120 m. speedboat b negotiates a curve whose radius is 240 m. each boat experiences the same centripetal acceleration. what is the ratio of the speeds of the boats

Answers

Ratio of the speeds of the boats with equal centripetal acceleration is 0.7.

Centripetal acceleration is defined as the change in tangential velocity and is experienced during uniform circular motion. It has a magnitude equal to the square of the body's speed v along the curve divided by the radius r (or distance) from the centre of the circle to the moving body. The centripetal acceleration ac is given by:

ac = v^2/ r

For the boat A:

ac = va^2/ 120

For the boat B:

ac = vb^2/ 240

As provided, the centripetal acceleration is equal for both boats, hence

va^2/ 120 = vb^2/ 240

va^2/vb^2 = 120/240

va^2/vb^2 = 0.5

va/vb = √0.5 = 0.7

Hence, the ratio of the speeds of the boats is 0.7

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A 90 g mass is attached to one end of a 10-cm-long spring. The other end of the spring is connected to a frictionless pivot on a frictionless, horizontal surface. Spinning the mass around in a circle at 90 rpm causes the spring to stretch to a length of 12 cm.

Answers

The spring constant of the spring is 6.66 N/m.

What is force?

The definition of force in physics is: The push or pull on a massed object changes its velocity.

An external force is an agent that has the power to alter the resting or moving condition of a body. It has a direction and a magnitude.

The rotational speed of the 90 g = 0.09 kg mass is: ω = 90 rpm

= 90×2π/60 radian/second.

 = 3π radian/second.

So centripetal force acting on the spring = mω²r

This causes the spring to stretch to a length of 12 cm = 0.12 m.

Hence, spring constant: k = mω²r/0.12 =  0.09×(3π)²×0.10/0.12 N/m = 6.66 N/m.

Hence, the spring constant of the spring is 6.66 N/m.

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a 1.5 kg 1.5 kg ball rotates on the end of a 3 m 3 m string in a vertical circle with a speed of 7 m/s 7 m/s. what force does the ball exert on the rope at the top of the vertical circle?

Answers

Force exerted by the ball on the rope is 24.5 N.

Force is an external influence that can change the velocity or motion of an object.

It can also be defined as the product of mass and acceleration.Mathematically, force F = m*a

mass of the ball = 1.5 kg

Radius of the circle = 3 m

Speed at which the ball is rotating = 7 m/s

Since the ball is rotating in a vertical circle, centripetal force acts on it.

Centripetal force is the force exerted on a rotating object and the gravitational force in a vertical circle is zero.

Mathematically centripetal force is Fc = mv²/r

Fc = 1.5 * (7)²/ (3)

Fc = 24.5 N

Force exerted by the ball on the rope at the top of the vertical circle is 24.5 N.

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A cyclist is travelling along a track at 8 m/s when a rabbit runs out in front of them. they stop their bike in 1.6 seconds. calculate their deceleration.

Answers

The deceleration experienced by the cyclist is -5 m/s. Deceleration is also called negative acceleration.

What is deceleration?

Deceleration is the term used to describe a decrease in speed as the body moves away from the beginning place. The opposite of acceleration is deceleration.

Given,

Initial velocity (V₁) = 8 m/s

Final velocity (V₂) = 0 m/s (Since the bike was stopped).

Time taken for the velocity drop (t) = 1.6 seconds

We know,

[tex]deceleration=\frac{V_{2}-V_{1} }{t} \\[/tex]

Substituting the values we get,

[tex]deceleration= \frac{0-8}{1.6}[/tex]

[tex]= -5 m/s[/tex]

Hence, the deceleration experienced by the cyclist is -5 m/s.

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The right answer is "-1.5 m/s²"

Answer explanation:

Acceleration = change in velocity / time

= (4 m/s – 7 m/s) / 2 s = -1.5 m/s2.

The acceleration is negative because the bike is slowing down.(decelarating)

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