You whirl a 2-kg body attached to a 1-meter cord around your head in a nearly horizontal circle with a speed of 4 m/s. the tension in the cord is:________

If a cube has a mass of 72.9 g and the dimension of the 3 cm side, its density would be

It can be defined as the mass of any object or body per unit volume of the particular object or body. Generally, it is expressed as in gram per cm³ or kilogram per meter³.

As given in the problem Use the data from the following figures to answer the questions below. The cube has a mass of 72.9 g and the cube has a dimension of 3 cm.

The volume of the cube = a³

                                        =3³

                                        =27 cm³

As given the mass of the cube is 72.9 g.

Density = mass/volume

              = 72.9 g/27 cm³

              =2.7 g/cm³

Thus, the density of the cube comes out to be 2.7 g/cm³.

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The question is incomplete the complete question is,

If a cube has a mass of 72.9 g and the dimension of the 3 cm side, What is its density in g/cm3?

The action being performed in the photograph has to do with checking tire pressure with an electronic gauge. Option B.

Checking tire pressure is important for maintaining the safety and performance of your vehicle. There are two common ways to check tire pressure:

A manual gauge requires inserting a probe into the tire valve stem and reading the pressure from a dial. An electronic gauge uses a digital display to show the pressure as shown in the photograph.

Both methods are effective, but it is important to ensure that the gauge is accurate and properly calibrated to get an accurate reading.

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Thermodynamics can be said to be a branch of Physics which involves the transfer of heat and other energy forms.

Thermal energy is the energy possesed by a system due to its temperature.

In thermodynamics, during the transfer of thermal energy, energy is wasted due to entryopy. And entropy is the measure of disorder of a system.

Therefore, in amy thermodynamic system that deals with the transfer of thermal energy, the most ideal state for that system is Entropy

ANSWER:

A. Entropy

For two identical loudspeakers emitting 1700-Hz sound waves, a point 4.0 m in front of speaker 1 is considered. The path-length difference between the two speakers is given by r = d sin(θ), and the given point is a point of maximum constructive interference.

As given in the question, Two identical loudspeakers, speaker 1 and speaker 2, are 2.0 m apart and are emitting 1700-Hz sound waves into a room where the speed of sound is 340 m/s.

Consider a point 4.0 m in front of speaker 1, which lies along a line from speaker 1, that is perpendicular to a line between the two speakers. The distance between the two speakers is 2.0 m.

To check for constructive interference or destructive interference, check for path difference. The sound waves coming out of the two speakers will have a path difference.

This path difference will depend on the angle made by the point with the line between the speakers. Let this distance be 'r'.

PART a.

The path-length difference 'r' can be given by: \(r = d sin θ\)

Here,d = distance between the two speakers = 2 m, sin θ = perpendicular distance from the point to the line between the speakers.

Therefore, \(sin θ = 4.0/√(2.0²+4.0²) = 0.89443r = 2 × 0.89443 = 1.78886 m\)

PART b.

The velocity of sound in air is given by

\(v = fλ\)

Where v = 340 m/s, and f = 1700 Hz

Substituting these values in the above equation, we get

\(λ = v/f = 340/1700 = 0.2 m\)

Hence, the wavelength of the sound waves emitted by the speakers is 0.2 m.

Since the path-length difference is equal to half the wavelength of the sound wave, the given point is a point of maximum constructive interference. Answer: Point of maximum constructive interference.

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Light photons always travel at a constant speed (the speed of light) regardless of their energy, while the velocity of electrons is not constant and can vary with their energy.

Light photons and energetic electrons do not have constant velocities independent of energy. Light photons, which are particles of electromagnetic radiation, travel at a constant speed in a vacuum, which is approximately 299,792 kilometers per second (or about 186,282 miles per second) in a vacuum, denoted as the speed of light (c). This speed is a fundamental constant of nature and remains constant regardless of the energy of the photons. In other words, all photons, regardless of their energy, travel at the same speed in a vacuum.

On the other hand, energetic electrons do not have a constant velocity independent of their energy. According to classical physics, the velocity of an electron can vary depending on its energy. In classical mechanics, the kinetic energy of an object is related to its velocity. However, in the microscopic world of quantum mechanics, the behavior of particles such as electrons is described differently.

In quantum mechanics, the concept of particle velocity becomes less straightforward. Instead of velocity, quantum particles are described by wavefunctions, which represent the probability distribution of finding the particle at a certain location. The wavefunction of an electron evolves over time according to the Schrödinger equation, and it does not directly correspond to a well-defined classical velocity.

However, in certain situations, such as in electron beams or particle accelerators, electrons can be accelerated to high energies. In these cases, the energy of the electrons is related to their speed, but it is not a constant relationship. As the energy of the electrons increases, their speed can also increase, but it is not independent of their energy.

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c. so the experiment can be duplicated by other scientists. It includes detailed information about the procedures used in an experiment, as well as the materials used. It is important because it allows other scientists to repeat the experiment to confirm the results.

This is a crucial part of the scientific process and helps to establish the validity and reliability of the results. Having a clear and detailed record of the experiment also ensures that it can be repeated in the future, and provides a basis for further research and experimentation.

he scientific method is a systematic and objective approach to solving problems and answering questions through empirical observation and experimentation.

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In the 1930s, Hubble discovered that galaxies exhibited a redshift in their spectra, indicating that they were moving away from us, which led to the conclusion that the universe is expanding.

Hubble observed and analyzed the spectra of galaxies using a spectrometer. He noticed that the spectral lines of most galaxies were shifted towards the red end of the spectrum, a phenomenon known as redshift. Hubble's discovery of the redshift in galaxy spectra provided evidence for the expanding universe. He realized that galaxies were not just static objects in space, but they were actually moving away from us at tremendous speeds.

This led to the development of the Hubble's law, which describes the relationship between the distance of a galaxy from us and its recession velocity. Hubble's discovery revolutionized our understanding of the universe and helped us to develop the Big Bang theory, which states that the universe began as a singularity and has been expanding ever since.

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Basal metabolic rate is the amount of energy expended by a person at rest. BMR varies by factors like gender, weight, age, and muscle mass. It is essential for maintaining bodily functions like breathing and circulating blood, and the energy needed for it is derived from food consumed.

As per the given question, the amount of energy required per day is 1,000 kcal. We will now calculate the minimum amount of protein, fat, or carbohydrate needed per day. 1 g of carbohydrate contains 4 kcal of energy.6,000 g of carbohydrates will contain

6,000 x 4 = 24,000 kcal of energy.

Thus, the energy obtained per day from carbohydrates will be 24,000/25 = 960 kcal.

Therefore, 6,000 g of carbohydrates will not provide sufficient energy for metabolic needs.1 g of protein contains 4 kcal of energy.

5,000 g of protein will contain 5,000 x 4 = 20,000 kcal of energy.

Thus, energy obtained per day from protein will be 20,000/25 = 800 kcal. Therefore, 5,000 g of protein will not provide sufficient energy for metabolic needs.

1 g of fat contains 9 kcal of energy.3,000 g of fat will contain 3,000 x 9 = 27,000 kcal of energy.

Thus, energy obtained per day from fat will be 27,000/25 = 1080 kcal. Therefore, 3,000 g of fat will provide sufficient energy for metabolic needs. Hence, the answer is 3,000 g of fat.

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Answer:

Explanation:

Work = Force times displacement. Therefore,

W = 3150(75.5) so

W = 238000 N*m

The type of sphere can have an effect on the time it takes for an object to travel a given distance, but the exact effect depends on the specifics of the situation and the forces acting on the object.

The type of sphere (e.g. solid, hollow, dense, lightweight, etc.) can have an effect on the time it takes for an object to travel a given distance. The exact effect depends on the specifics of the situation, such as the initial velocity of the object, the acceleration due to gravity, and any other forces that may be acting on the object. For example, a dense solid sphere will fall faster than a lightweight hollow sphere under the same conditions because it has a higher mass and is more affected by gravity. A dense solid sphere will also take less time to travel a given distance than a lightweight hollow sphere, assuming that both are dropped from the same height and are not subject to any air resistance. On the other hand, if the objects are rolling down a ramp or a surface with friction, the time to travel the distance could be influenced by other factors, such as the coefficient of friction between the sphere and the surface, the size and shape of the sphere, and the angle of the ramp.

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Velocity, acceleration, force, and displacement, have magnitude and direction (ie vector quantity) in common

This is a which have both magnitude and direction. Example include:

This is a quantity which has magnitude but no direction. Example include:

From the above, we can see that velocity, acceleration, force, and displacement, have magnitude and direction (ie vector quantity) in common

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Answer:

B. Luminosity

Explanation:

The luminosity of a star is a measure of its brightness.

Have a good day and stay safe!

Answer:

All fluids exert pressure like the air inside a tire. The particles of fluids are constantly moving in all directions at random. As the particles move, they keep bumping into each other and into anything else in their path. These collisions cause pressure, and the pressure is exerted equally in all directions.

Explanation:

The typical air bags from 1997 and 1998 automobiles are compared in Figure 1. The values depicted are the average of the information provided by 11 separate cars.

Inflation is a unit of measurement used to determine how much a group of goods and services have increased in cost over a given period of time, usually a year. Possibly one of the most well-known economics terms. Because of inflation, nations have gone through protracted periods of instability. In the field of economics, inflation refers to an increase in the overall cost of goods and services in a country.

The majority of economists concur that chronic excessive expansion in the money supply is the primary driver of high inflation and hyperinflation, both of which have profoundly disruptive consequences on the actual economy. John Taylor, a Stanford economist, claims that when the Federal Reserve sets an interest rate that is too low or when the expansion of the money supply is too rapid, inflation rises. As of right now, it is moving too quickly.

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Answer:

Fricción.

Explicación:

Caminando con otro compañero al mismo tiempo y al mismo ritmo, el movimiento se produce debido a la fricción del suelo y la suela de los zapatos porque la fricción es la fuerza que ayuda en el movimiento de los objetos de un lugar a otro. Si no hay fricción entre el suelo y la suela de los zapatos, no podemos dar un paso por lo que podemos decir que la fricción nos mueve hacia adelante.

Answer:

a) T=549.36N Upwards

b) T=448.56N Upwards

c) T=650.16N Upwards

Explanation:

The very first thing we can do to solve this problem is to draw a free body diagram we can use to analyze the situation (see attached picture).

On the diagram we can see there are only two forces acting on the object: the tension of the rope and the weight of the object itself.

a)

Since the object is moving at a constant speed, this means that its acceleration will be zero. So we can do a sum of forces like this:

\(\sum F=0\)

T-W=0

T=W

T=mg

\(T=(56kg)(9.81m/s^{2})\)

T=549.36N upwards

b)

For part b, since the object is accelerating downwards, we wil say that it's acceleration is negative, so \(a=-1.8m/s^{2}\)

so we can do a sum of forces again:

\(\sum F=ma\)

so

T-W=ma

T=ma +W

T=ma+mg

T=m(a+g)

and now we substitute:

\(T=(56kg)(-1.8 m/s^{2}+9.81 m/s^{2})\)

which yields:

T=448.56N upwards (in this particular case, the tension always goes upwards)

c)

Since the object is moving upwards, we can say that its acceleration will be positive, so \(a =1.8m/s^{2}\)

we can take the solved equation we got on the previous part of the problem, so we get:

T=m(a+g)

\(T =(56kg)(1.8 m/s^{2}+9.81 m/s^{2})\)

which yields:

T=650.16N upwards

The tension force in the rope when the object moves upward at a constant velocity is 548.8 N.

The tension force in the rope when the object accelerates downward at a constant acceleration is 448 N.

The tension force in the rope when the object accelerates upward at a constant acceleration is 649.6 N.

The given parameters:

The tension force in the rope when the object moves upward at a constant velocity;

T = ma + mg

at constant velocity, a = 0

T = mg

T = 56(9.8)

T = 548.8 N

The tension force in the rope when the object accelerates downward at a constant acceleration of 1.8 m/s².

T = mg - ma

T = m(g - a)

T = 56(9.8 - 1.8)

T = 448 N

The tension force in the rope when the object accelerates upward at a constant acceleration of 1.8 m/s².

T = mg + ma

T = m(g + a)

T = 56(9.8 + 1.8)

T = 649.6 N

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According to Kepler's 2nd law, comets (which have eccentric orbits) should spend a lot more of their time: closer to the Sun during their orbit.

Kepler's 2nd law, also known as the law of equal areas, states that a line joining a planet or comet to the Sun sweeps out equal areas in equal intervals of time. This means that when a comet is closer to the Sun, it travels faster and covers more area in a given amount of time.

As a result, comets spend a lot more of their time closer to the Sun during their orbit, where they move faster, and less time in the outer regions of their orbit. This is because the gravitational force from the Sun accelerates them as they approach, causing them to move faster and cover more area in less time.

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Given,

The length of the slab, L=12 m

The initial temperature, T₁=10°C

The final temperature, T₂=30°C

The coefficient of the linear expansion of the concrete is α=12×10⁻⁶ /°C

The change in the length of the slab is given by,

Where ΔT is the change in the temperature.

Therefore,

On substituting the known values,

Thus the expansion in the length of the slab in the given temperature range is 0.003 m.

Thus the gap between the slabs should be 0.003 m

Answer:

The moon's orbit draws the oceans to it, which triggers ocean tides. Force produces stars and planets by gathering the mass from which it exists.

Explanation:

The moon's orbit draws the oceans to it, which triggers ocean tides. Force produces stars and planets by gathering the mass from which it exists.

Answer is above

Hope this helps.

Answer:

This means the jet speed after 19s will be 587.9 m/s

Explanation:

each second the speed increases in 23.1 m/s, doing that for 19 seconds:

23.1 * 19 = 438.9 (do this math)

149 + 438.9 = 587.9 (do this math)

Location of the ball is top of the circle and acceleration is 3g.

Since tension force is more, surely ball is having net force upward and hence, the location of the ball in this case is top of the circle.

Any object that moves in a circle has an acceleration vector towards the center of that circle. This is known as Centripetal acceleration.

total force/ net force when ball is top of the circle is sum of tension force and gravity force.

\(F_{net\) = T + mg

Because of this net force, there is centripetal acceleration towards the center.

so, T + mg = ma

2mg + mg = ma

3mg = ma

a = 3 × force of gravity

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Answer:

Isotopes can both be the same element but have a different number of electrons

Explanation: not sure if more was supposed to be there, but i tried

The statement best describes deena's error is: Find acceleration by finding the area of the rectangle above the line.

Acceleration is given by the ratio of Resultant or total force acting on any object and the its mass.

Deena made a chart to summarize features of a velocity vs. time graph for objects with constant acceleration and objects with constant velocity.

In the  velocity time graph, the area under the curve shows the displacement of the object and the slope represents the acceleration.

Thus, the deena's error is  Find acceleration by finding the area of the rectangle above the line.

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Answer:

What the other dude said

Explanation:

Answer:

power

Explanation:

it helps to do work without power we cant do any things

The work in a 3rd lever is situated between the load and the pivot. Less effort is required to shift the weight if the pivot is near to it. The weight will travel a longer distance if the pivot is closer to the effort. 

Mechanical advantage is defined as a measure of the ratio of output force to input force in a system, It is used to analyze the forces in simple machines like levers and pulleys.

Mechanical advantage = output force(load) /input force (effort)

mechanical advantage  = velocity ratio ×Efficiency

A lever that swings around a fixed point is the basic component of a lever. The pivot of a lever is its fixed point. A lever, like other machines, facilitates labor by adjusting the force or the length across which the force is applied to the device.

Thus, we can say that the lever which makes our work easier only by accelerating the rate of work is

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Total internal reflection occurs when light travels from a more optically dense medium to a less optically dense medium, such as from water to air. This phenomenon happens when the angle of incidence of the light ray is greater than the critical angle.

Among the given options, (a) and (d) satisfy the conditions for total internal reflection. In option (a), light traveling from a less dense medium towards a more dense medium (e.g., from air to water) can undergo total internal reflection.

This occurs when the angle of incidence exceeds the critical angle, causing the light to be completely reflected back into the less dense medium.

Similarly, in option (d), light traveling from a more dense medium towards a less dense medium (e.g., from water to air) can also undergo total internal reflection.

Again, this happens when the angle of incidence exceeds the critical angle, causing the light to be completely reflected back into the more dense medium.

On the other hand, option (b) is incorrect because light traveling from a more dense medium to a less dense medium (e.g., from water to air) would result in refraction rather than total internal reflection.

Option (c) is also incorrect since the speed of light is not directly related to total internal reflection. Total internal reflection depends on the change in the refractive index between the two media, rather than the speed of light.

Therefore, the correct options are (a) and (d) for total internal reflection of light.

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Every magnet consists of two poles one is the south pole other one is the north pole. All magnets have two poles. This statement is correct.

The area at either end of a magnet where the external magnetic field is strongest is known as a magnetic pole.

Every magnet consists of two poles one is the south pole other one is the north pole like poles attracts each other while unlike poles repel each other.

Hence option (a) is correct. All magnets have two poles.

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The Pythagorean Theorem states that the squares on the hypotenuse (the side across from the right angle) of a right triangle, or, in standard algebraic notation, a2 + b2, are equal to the squares on the legs.

The Pythagorean theorem, sometimes known as Pythagoras' theorem, is a fundamental relationship between a right triangle's three sides in Euclidean geometry. According to this rule, the areas of the squares on the other two sides add up to the area of the square whose side is the hypotenuse, or the side across from the right angle. The Pythagorean equation, which is typically used to express this theorem, can be expressed as an equation linking the lengths of the legs (a, b), and the hypotenuse (c):

There are several ways to generalize the theorem, including to higher-dimensional spaces, non-Euclidean spaces, objects other than right triangles, and even things that are not triangles at all but n-dimensional solids. The Pythagorean theorem has garnered interest outside of mathematics as a representation of mathematical mystique, power, or obscurity; there are numerous references to it in popular works of fiction, dramas, musicals, songs, stamps, and cartoons.

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Answer:

43740 N and attractive force

Explanation:

Given that,

Charge 1, q₁ = -54.0 μC

Charge 2, q₂ = +36.0 μC

The distance between charges, r = 2 cm = 0.02 m

We need to find the force between charges. The formula for the force between charges is given by :

\(F=k\dfrac{q_1q_2}{r^2}\)

Put all the values,

\(F=9\times 10^9\times \dfrac{54\times 10^{-6}\times 36\times 10^{-6}}{(0.02)^2}\\\\F=43740\ N\)

As the charges are opposite, the force between them is attractive. Hence, the required force is 43740 N.

Answer:

Explanation:

In this problem we are required to find the potential energy possessed by the television

Given data

mass of television m = 15 kg

height  added above the ground, h= 1-0.3 = 0.7 m

acceleration due to gravity g = 9.81 m/s^2

apply the formula for potential energy we have

P.E= m*g*h

P.E = 15*9.81*0.7 = 103 Joules