A block with a mass of 2kg is pushed 20cm and a constant speed up an incline that makes a 40 degree angle with the floor. how much work is done by gravity on the block ? let d be the displacement of the block.

Answer:

camels have humps to store fat which is then converted to energy when food is scarce ( the humps are not used for storing water )

Answer: camels have humps to store fat which is then converted to energy when food is scarce ( the humps are not used for storing water )

Mountains, tops of buildings, and high-flying aircraft are all part of Earth's atmosphere, no matter how high they are. On the other hand, space doesn't belong to our atmosphere, it is outside of it. Having this in mind, the best location to place a telescope used to observe x-rays from stars is in space.

A telescope is an optical instrument that uses lenses, curved mirrors, or a combination of both to observe distant objects, or a variety of devices that emit, absorb, or reflect electromagnetic radiation to observe distant objects.

You can get started for less than $200. Once your budget exceeds $400, you will be able to purchase very capable telescopes. When you spend $600 or more, the scopes become more powerful and feature-rich.

The telescope made its debut in the Netherlands. The national government in The Hague discussed a patent application for a device that aided in "seeing faraway things as if they were nearby" in October 1608, according to the national government. It was made up of a convex and concave lens housed in a tube. Objects were magnified three or four times by the combination.

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The energy transferred by the appliance using mains electricity is 17.3 KJ

The energy transferred can be obtained as follow:

E = ½QV

E = ½ × 150 × 230

E = 75 × 230

E = 17250 J

Divide by 1000 to express in kilojoules

E = 17250 / 1000

E = 17.3 KJ

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According to NEC 110-14(c)(2), terminals for equipment rated over 100 ampere and pressure connector terminals for conductors larger than No. 1 shall have the conductor sized according to the 75°C temperature rating listed in Table 310.15(B)(16).

In this context, "terminals" refer to the points where electrical connections are made, "ampere" is a unit of electrical current, "pressure connector terminals" are specific types of terminals that create a connection by applying pressure on the conductor, and "conductor" is the material that allows the flow of electrical current.

This requirement is specified in NEC 110.14(C)(2), which addresses the sizing of conductors and terminals for electrical equipment. The section states that conductors used with terminals for equipment rated over 100 amperes or for pressure connector terminals for conductors larger than No. 1 AWG shall be sized based on the 75°C column of Table 310.15(B)(16). This table provides ampacity ratings for conductors of various sizes and insulation types at different temperatures and is used to determine the appropriate conductor size for a given electrical application.

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v ≈ 2.215 m/s, The maximum linear speed at which the penny can travel without slipping is given by the formula v = Rω, where R is the distance from the center of the turntable to the penny (0.10 m) and ω is the angular speed of the turntable.

The penny will start to slip when the centrifugal force (mRω^2) exceeds the force of static friction (μs mg), where m is the mass of the penny, g is the acceleration due to gravity, and μs is the coefficient of static friction (0.50).

Setting these two forces equal to each other and solving for ω, we get:

mRω^2 = μs mg
ω^2 = μs g / R
ω = sqrt(μs g / R)

Substituting the given values, we get:

ω = sqrt(0.50 x 9.81 / 0.10) = 3.13 rad/s

Finally, we can calculate the maximum linear speed using the formula v = Rω:

v = 0.10 x 3.13 = 0.313 m/s

Therefore, the answer is A) 0.49 m/s (the closest option to 0.313 m/s).
To find the maximum linear speed at which the penny can travel without slipping, we can use the formula for the centripetal force acting on the penny:

Fc = μ * m * g

where Fc is the centripetal force, μ is the coefficient of static friction, m is the mass of the penny, and g is the acceleration due to gravity (approximately 9.81 m/s²).

Since we want to find the linear speed (v), we can relate centripetal force to linear speed using the formula:

Fc = m * v² / r

where r is the distance from the center of the turntable (0.10 m).

Combining the two equations, we get:

μ * m * g = m * v² / r

We can simplify this equation by canceling out the mass (m):

μ * g = v² / r

Now, we can plug in the given values for the coefficient of static friction (μ = 0.50) and the distance from the center (r = 0.10 m):

0.50 * 9.81 = v² / 0.10

Solve for v:

v² = 0.50 * 9.81 * 0.10
v² = 4.905
v = √4.905
v ≈ 2.215 m/s

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The weight of an object would be the least at the center of the Earth. 2000 miles above earth's surface at the equator at the south pole at the north pole at the center of earth.

The weight of an object depends on the gravitational force acting on it. The gravitational force is inversely proportional to the square of the distance between the object and the center of the Earth. As the object moves farther away from the center of the Earth, the gravitational force decreases.

At the center of the Earth, the distance between the object and the center is at its minimum. Therefore, the gravitational force and consequently the weight of the object would be the least at the center of the Earth.

In contrast, as the object moves further away from the center of the Earth, such as 2000 miles above the Earth's surface, the distance between the object and the center increases, resulting in a stronger gravitational force and a greater weight.

Thus, of the options provided, the weight of an object would be the least at the center of the Earth.

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Answer:

Heat

Explanation:

Answer:

transverse

Explanation:

The motion shown in the diagram is of a) Transverse waves

Waves in which  all the points on the wave  oscillates along the paths at the right angle to the direction of the wave's motion are called transverse waves

It can be observed from the given figure  that direction of wave is in positive x direction and direction of particle is in positive y direction , hence motion of particle is perpendicular to the direction of wave  hence , it is a transverse waves

correct answer is a) Transverse

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Answer:

Explanation:

Step 1: Calculate the magnification of the telescope. The magnification of a telescope is given by the ratio of the focal length of the objective lens to the focal length of the eyepiece lens. In this case, the focal length of the objective lens is 100 cm, and the focal length of the eyepiece lens is 2.50 cm. Magnification = (Focal length of objective) / (Focal length of eyepiece) Magnification = 100 cm / 2.50 cm Magnification = 40 Step 2: Determine the average angular diameter of the Moon. The Moon's angular diameter varies between 29' 21" and 33' 30". To simplify the problem, let's take the average of these two values. Average angular diameter = (29' 21" + 33' 30") / 2 Average angular diameter = (29.35' + 33.5') / 2 Average angular diameter = 31.425' Step 3: Convert the average angular diameter to degrees. 1 degree = 60 arcminutes, so we need to convert the average angular diameter from arcminutes to degrees. Average angular diameter (in degrees) = 31.425' / 60 Average angular diameter (in degrees) = 0.52375° Step 4: Calculate the angular diameter of the Moon as seen through the telescope. To find the angular diameter of the Moon when viewed through the telescope, we need to multiply the average angular diameter by the magnification of the telescope. Angular diameter through telescope = (Average angular diameter) × (Magnification) Angular diameter through telescope = 0.52375° × 40 Angular diameter through telescope = 20.95°

Answer:

38

Explanation:

76 divided by 2 =38

Answer:

0.2

Explanation:

The given parameters are;

The acceleration of the train, a = 0.2·g

The mass of the person standing on the train = m

Let μ represent the coefficient of static friction, we have;

The force acting on the person, F = m × a = m × 0.2·g

The force of friction acting between the feet and the floor, \(F_f\) = m·g·μ

For the person not to slide we have;

The force acting on the person = The force of friction acting between the feet and the floor

F = \(F_f\)

∴ m × 0.2·g = m·g·μ

From which we get;

0.2 = μ

The coefficient of static friction that must exist between the feet and the floor if the person is not to slide, μ = 0.2.

If the applied voltage is polarised in the opposite direction (negative on red and positive on black), the metre will display "backwards."

Some devices may be electrically charged at all times if an outlet has reverse polarity. Electricity will flow to the switch in a properly connected outlet; with reversed polarity, it will be present in the item even when it is not switched on.Reverse polarity protection is an internal circuit that ensures the device is not destroyed if the polarity of the power source is reversed. The reverse polarity protection circuit disables power to the transmitter or transducer's sensitive electronic circuitry.If you reside in a house that has had amateur electrical work done, there's a strong chance you have some outlets with reversed polarity. That essentially means that some of your channels may surprise you. Uh oh! While not all shocks are lethal, they are all painful and unpleasant. Only a qualified electrical contractor in North Scottsdale, AZ can perform electrical repairs in your home.

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Therefore, the compounds can be ranked in order of decreasing ease of elution from a column of silica gel as follows: 2-octanol > 1,3-dichlorobenzene > t-butyl cyclohexane> benzoic acid.

When a mixture of compounds is passed through a column of silica gel, the compounds interact differently with the stationary phase based on their polarity and other physical properties. The more polar the compound, the more it interacts with the silica gel and the slower it elutes from the column. Based on this, the compounds can be ranked in order of decreasing ease of elution from the column.

The first compound, 2-octanol, is a relatively nonpolar compound and will elute from the column relatively quickly. The next compound, 1,3-dichlorobenzene, is more polar than 2-octanol and will therefore interact more with the silica gel, leading to a slower elution. T-butyl cyclohexane is even more polar than 1,3-dichlorobenzene and will elute more slowly from the column. Finally, benzoic acid is the most polar of the compounds listed and will interact strongly with the silica gel, leading to the slowest elution from the column.

Therefore, the compounds can be ranked in order of decreasing ease of elution from a column of silica gel as follows: 2-octanol > 1,3-dichlorobenzene > t-butyl cyclohexane> benzoic acid.

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\(\huge\mathfrak\red {Answer:}\)

If a train travelled 500 meters in 25 seconds then,

Speed = 500m/25sec

\(\mathfrak\purple {Hope\: this\: helps\: you...}\)

speed=500m/25sec

20m/sec

Poor circulation is not a benefit of stretching.

How many minutes of stretching should a person perform before participating in physical activities?

Stretching for 5 to 10 minutes is probably enough for most activities. It's important, however, to adequately stretch all the muscles you'll be using. Three benefits of stretching before a workout include increased blood flow.

What are the 5 benefits of stretching?

Which benefit comes with flexibility?

Activities that lengthen and stretch muscles can help you prevent injuries, back pain, and balance problems. A well-stretched muscle more easily achieves its full range of motion.

Thus, poor circulation is the correct option.

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A thermal emitter cannot be accurately approximated by hot, thin gas.

Devices known as thermal emitters radiate heat from a heated component. Some of them can be used as broadband infrared light sources for applications in spectroscopy, for instance, when the very low brightness is acceptable. Some of them are special types of incandescent lamps, sometimes in a very compact form. Their emission may be fairly continuous, but not always with high calibration accuracy. Unique designs, such as the globar and the Nernst lamp. These sources occasionally have an infrared filter installed that only allows the transmission of infrared light in a specific spectral range.

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Answer:

two up quarks and one down quark

Answer:

i have absolutly no idea how to do it but i looked it up and your answer should be B. i could be wrong but thats what the web told me

Specific heat capacity is the amount of heat energy required to raise the temperature of a unit mass of a substance by one degree Celsius or Kelvin. A high specific heat capacity means that it takes a relatively large amount of heat energy to raise the temperature of a given mass of the substance. Conversely, a low specific heat capacity means that it takes relatively less heat energy to raise the temperature of the substance by the same amount.

For example, water has a high specific heat capacity compared to most other common substances. This means that it takes a relatively large amount of heat energy to raise the temperature of a given mass of water by one degree Celsius or Kelvin. This property of water is why it is used as a coolant in some industrial processes and why it helps to moderate the temperature of the earth's atmosphere and oceans. On the other hand, metals have a relatively low specific heat capacity, which makes them good conductors of heat.

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The displacement and velocity values at time, t = 8 seconds are; 11.76 and -0.545 respectively

Part A

The possible values in the table are;

Displacement;

t = 7 seconds, y = 10.02

t = 8 seconds, y = 11.01

t = 9 seconds, y = 13.5

Velocity;

t = 7 seconds, y = 0.06

t = 8 seconds, y = -0.05

t = 9 seconds, y = -1.15

The equation for interpretation which is a form of linear equation is presented as follows;

\(y - y_0 = \frac{y_1 - y_0}{x_1 -x_0} \times (x - x_0)\)

Interpolating for the displacement at t = 8.0 seconds is as follows;

\(y - 10.02 = \frac{13.5 - 10.02}{9 - 7} \times (8 - 7)\)

Which gives the displacement at t = 8.0 seconds as 11.76

Interpolating for the velocity at t = 8.0 seconds is as follows;

\(y - 0.06 = \frac{(-1.15) - 0.06}{9 - 7} \times (8 - 7)\)

Which gives the velocity at t = 8.0 seconds as -0.545

The values for the displacement and velocity obtained by interpolation (11.76 and -0.545) are different from the displacement and velocity values in the table at t = 8 which are; 11.01 and -0.05 respectively

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The rod she chooses, to give the sphere a uniform negative charge by induction is the positively charged rod.

Charging an object by induction is a process of inducing a charge on the object by bringing another charged object close to it.

When a positively charged rod is brought near a neutral sphere (equal negative and positive charge),  the positive charge of the rod will repel the positive charge of the sphere, leaving the sphere with excess negative charge.

Thus, the rod she chooses, to give the sphere a uniform negative charge by induction is the positively charged rod.

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Answer:

The answer is D

Explanation:

La expresión del movimiento armónico simple permite encontrar los resultados para las preguntas sobre el movimiento de la masa y el resorte son:  

     a) La fase inicial es cero y la amplitud es 0,05 m

     b)  La elongación y velocidad para el tiempo dado son:

          x =  -0,0445 m y  v = -0,0229 m/s

      c) La velocidad angular es:        w = 19,8 rad/s

      d) El  periodo vale   T = 0,317 s

      e) La constante de resorte es:      k = 196 N/m

      f)  La velocidad máximas es:     v= 0,99 m/s

     g) La energia potencial es:       Ep = 0,245 J

     h) La energía cinética es:     K = 0,2058 J

      i) La aceleración es:  a = -4,61 m/s²

      j) La velocidad es:  v= -0,806 m/s

El movimiento oscilatorio ocurre cuando hay un fuerza recuperadora en el sistema, si tea fuerza es proporcional al desplazamiento el movimiento se denomina armónico simple y es descrito por la expresión.

                       x= A cos (wt +Ф)

                       w² = k/m

Donde x es el desplazamiento, A la amplitud del movimiento, w la velocidad angular, t el tiempo, fi una constante de fase que se determina con los valores iniciales, k la constante del resorte y m la masa.

e) Indican el desplazamiento de x= 5 cm = 0,05 m para una masa de m= 1000 g = 1 kg.  Usemos la condición de equilibrio y la ley de Hooke para encontrar la constante del resorte.

                 W = F

                mg = k x

                 \(k = \frac{mg}{x}\)

Calculemos.

                 k = \(\frac{1 \ 19.8}{0.05}\)  

                 k = 196 N/m

c) indican la masa aplicada para el movimiento es m= 0,5 kg , podemos buscar la velocidad angular

                  w= \(\sqrt{ \frac{k}{m}}\)

                  w = \(\sqrt{ \frac{196}{0.5} }\)  

                  w = 19,8 rad/s

a) La fase y la mplitud.

La amplitud es la elongación máxima del movimiento  

            A = 0,05 m

para la fase usamos que el bloque se suelta, por lo cual el tiempo es cero t=0 ,desde la posición de máxima elongación v= 0, usemos la relación entre la posición y la velocidad.

            v= \(\frac{dx}{dt}\)

            v = -A w sin (wt +Ф)

            0 = - A w sin Ф

Por lo tanto fi debe ser cero, para que la función seno ea cero.

            Ф =0

b) Calculamos para t=0,5 s la elongación y la velocidad.

La ecuación del movimiento queda.

              x = A cos wt

Calculamos.

Recuerda que los ángulos están en radianes.

                x = 0,05 cos 19,8 0,5

                x =  -0,0445 m

La velocidad es:

                v = 0,05 19,8 sin 19,8 0,05

                v = -0,0229 m/s

d) La velocidad angular esta relacionada con el periodo.

            W = \(\frac{2\pi}{T}\)  

            T = \(\frac{2\pi}{w}\)  

             T = \(\frac{2\pi}{19.8}\)2pi/19,8

             T = 0,317 s

f) El valor máximo de la velocidad.

Este valor ocurre cuando la función seno vale 1

             v =Aw

             v= 0,05 19,8

              v= 0,99 m/s

g) La energía mecánica del sistema se mantiene constante porque no hay fuerzas de roce, por lo tanto en el punto de máxima elongación la energía es totalmente potencial.

             U = ½ k A²  

              U = ½ 196 0,05²  

             U = 0,245 J

h) la energía cinética para x=2 cm = 0,02 m

En todos los puntos la energía mecánica es la suma dela energía cinética mas la enriar potencial

            Em₀ = K + U

            K = Em₀ – U

            K = ½ k ( A² -x² )

            K = ½ 196 ( 0,05² – 0,02² )

            K = 0,2058 J

i)  La aceleracion y la velocidad están relacionadas

              a = \(\frac{dv}{dt}\)  

              a = - A w² cos wt

             a = - 0,05 19,8² cos 19,8t

              a = -19,6 cos 19,8 t

              a = - 19,8cos 19,8 0,25

              a = -4,61 m/s²  

j) La velocidad para t=1 s.

             v= - A w sin wt

             v = - 0,05 19,8 sin 19,8 1

             v= -0,806 m/s

En conclusión con la expresión del movimiento armónico simple podemos encontrar los resultados para las preguntas sobre el movimiento de la masa y el resorte son:

    a) La fase inicial es cero y la amplitud es 0,05 m

     b)  La elongación y velocidad para el tiempo dado son:

          x =  -0,0445 m y  v = -0,0229 m/s

      c) La velocidad angular es:        w = 19,8 rad/s

      d) El  periodo vale   T = 0,317 s

      e) La constante de resorte es:      k = 196 N/m

      f)  La velocidad máximas es:     v= 0,99 m/s

     g) La energia potencial es:       Ep = 0,245 J

     h) La energía cinética es:     K = 0,2058 J

      i) La aceleración es:  a = -4,61 m/s²

      j) La velocidad es:  v= -0,806 m/s

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The force constant of the spring is 237.5 J.

To find the force constant of the spring, we can use Hooke's Law, which states that the force exerted by a spring is directly proportional to its displacement.

The work done on the spring is given by the formula:

Work = \((1/2) * k * (x^2)\)

Where:

Substituting the given values into the equation, we have:

1900 J = (1/2) * k * (4 m)^2

1900 J = 8 * k

k = 1900 J / 8

  ≈ 237.5 J

Therefore, the force constant of the spring is approximately 237.5 J.

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The plane flies at speed of 160m/s should drop the package when it reaches at a distance of 824m.

A dropped object travels quickly in the direction of the earth's center. Newton's second law states that the net force applied on an object determines its acceleration. If air resistance is small, the gravitational force, which is also known as an object's weight (w), acts as the net force on any falling object.

Free-fall acceleration seems to be another name for gravitational acceleration. Gravitational fields established by masses pull other masses approach them.

\(h = ut + 1/2 gt^2 ; u=0130 = 1/2 \times 9.8 \times t^2t= 5.15sec\)

The packet travel with the time period of 5.15sec

The distance = v x t

                      160m/s x 5.15s = 824m

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The given statement "In general, as a reaction proceeds to make more products, reaction rate decreases" is true.

This is because as the concentration of reactants decreases, there are fewer collisions between particles, leading to a slower rate of reaction. Additionally, some reactions may also be limited by factors such as the availability of reactants or the presence of catalysts.

However, there are some reactions where the opposite may be true, such as in a chain reaction where the formation of one product can trigger the formation of more products, leading to an increase in reaction rate.

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Answer:

Explanation:

According to Newton's third law of motion, forces always act in equal but opposite pairs. Another way of saying this is for every action, there is an equal but opposite reaction. This means that when you push on a wall, the wall pushes back on you with a force equal in strength to the force you exerted. 1.True 2.falues 3.true 4. not really sure on this one

Answer:

you need kinetic energy because it is the energy that is used when In motion

The type of energy that one acquire when you eat a bowl of hot vegetable soup is chemical energy.

Chemical power the bonds of chemical molecules contain energy. Exothermic reactions are those in which chemical energy is released during the reaction, frequently in the form of heat.

Some of the heat energy needed for a reaction to continue can be stored as chemical energy in newly created bonds.

Food particles go through a chemical reaction that releases chemical energy when we eat it. The body then uses this energy to carry out its regular tasks.

As a result, when you eat a cup of vegetable soup, you also consume the chemical energy it contains.

Thus, the answer is chemical energy.

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