Pe un reostat sunt scrise valorile R=220 Ω, I=0,8A. Poate fi legat acest reostat la o priza de 220V?

Terrestrial planets are mainly composed of rock and metals while the giant planets are made predominantly of volatiles.

It is a system that collection of all the planets and spatial bodies revolving around the sun because of the gravitational pull of the sun.

Our Solar System is based on a heliocentric model in which the Sun is assumed to reside at the central point of the planetary system.

Celestial bodies like Earth are referred to as terrestrial planets. They have a hard surface and are composed of rocks or metal.

Thus, Terrestrial planets are mainly composed of rock and metals while giant planets are made predominantly of volatiles.

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The total resistance of this circuit is 15Ω and the total power of the circuit is 60W.

The power is the ratio of the square of voltage and resistance. The total resistance is obtained from the addition of series and parallel resistance.

From the given,

Total resistance (Requ) = R₁ + R₂

R₁ is a series resistance

R₂ is the parallel resistance

R₂ = 1/15 Ω + 1/10 Ω

   = 10×15 / (15+10)

  = 150 / 25

 = 6Ω

Parallel resistance R₂ = 6Ω

R(equivalent) = R₁ + R₂

                      = 9 + 6

                      = 15Ω

Thus, the total resistance is 15 Ω.

The total power, P = E² / R(equivalent)

E represents the voltage

R(equivalent) is the equivalent resistance

P = 30×30 / 15

  = 60 watts.

Thus, the total power in the circuit is 60 watts.

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Answer:

Average speed = 2.5 mph

Distance = 22.352 meters

Explanation:

Calculate speed, distance or time using the formula d = st, distance equals speed times time.

Calculate speed, distance or time using the formula d = st, distance equals speed times time.

You can use this formula for any question like this

Answer:

centimeters

Explanation:

earth's plates move only a few centimeters per year.

Answer:

Gpe = 30000J

Explanation:

Given the following data;

Weight = 100N

Height = 300m

To find the gravitational potential energy (gpe);

Gravitational potential energy can be defined as an energy possessed by an object or body due to its position above the earth surface.

Mathematically, potential energy is given by the formula;

\( G.P.E = mgh\)

Where,

G.P.E represents potential energy measured in Joules.

m represents the mass of an object.

g represents acceleration due to gravity measured in meters per seconds square.

h represents the height measured in meters.

Gpe = mgh

But weight = mg = 100N

Substituting into the equation, we have:

Gpe = 100*300

Gpe = 30000J

C) Straight up

If the ball is thrown vertically up, only the horizontal component of the runner and the ball will be the same, and in that case only he may catch the ball. To catch the ball, the horizontal component of the force on the ball and the runner should be the same.

The horizontal velocity component (vx) describes the influence of the velocity in displacing the projectile horizontally. The vertical velocity component (vy) describes the influence of the velocity in displacing the projectile vertically.

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The mass of the bin is 23kg, so the weight of the bin is calculated as C) - 230N

Measure of the force exerted on the mass of body due to gravity is called weight.

Weight of an object is the force with which it is attracted towards the center of the Earth due to gravity. Weight is given by formula as: weight=mass x gravity.

gravity is the acceleration due to gravity, which is approximately 9.81 m/s² near the Earth's surface.

So, weight = 23kg x 9.81 m/s²

weight = 225.63 N

Therefore, the answer is C) - 230N (rounded to the nearest whole number).

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At the instant shown, the six scenarios can be ranked in terms of the magnitude of current in the light bulb as follows:

1) Scenario 1 - Here, the battery is directly connected to the light bulb without any other resistors in the circuit. Therefore, the current flowing through the bulb will be the maximum among all the scenarios.

2) Scenario 3 - In this case, the battery is connected to the light bulb through a resistor. However, the resistance is less compared to other scenarios, so the current will be higher than in other cases.

3) Scenario 4 - Here, the battery is connected to the light bulb through a higher resistance compared to scenario 3. This will result in a lesser current in the bulb.

4) Scenario 5 - In this scenario, the battery is connected to the light bulb through a much higher resistance than in the previous two scenarios. Therefore, the current flowing through the bulb will be lower.

5) Scenario 6 - Here, the battery is connected to the circuit in such a way that the current will bypass the light bulb. Therefore, the bulb will not light up and the current flowing through it will be zero.

6) Scenario 2 - This scenario is similar to scenario 6 where the switch is open, so the circuit is not complete, and hence there will be no current flowing through the light bulb.

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The number of times the train accelerated is 3 times.

option 3 is the correct answer.

The number of times the train accelerates in the given scenario depends on the speed or velocity of the train at every given time.

a = Δv / Δt

where;

From the formula given above, the train will only accelerate whenever there is a change in the velocity of the train. If the velocity of the train is constant, then the acceleration of the train will be zero.

The number of acceleration of the train in the given scenario is determined as follows;

Thus, from the illustration given above, the train change its speed three times and accelerated in those situation.

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to find the modulus of elasticity MoE at 23% of moisture content based on the already given modulus of elasticity of 12% moisture content we need to consider a shrinkage behavior of material. the expected MoE comes out to be approximately \(6,836 N/mm².\)

given information:

Modulus of elasticity at 12% moisture content =7,920 N/mm²

resultant shrinkage or final shrinkage percentage FSP = 30%

To calculate the expected MoE at 23% moisture content we have the following equation:

MoE-23% =   \(MoE-12%\) \((1 - FSP (23 - 12) / (100 - 12))\)

MoE-23% = \(7,920 N/mm² × (1 - 0.30 × (23 - 12) / (100 - 12))\)

MoE-23% =\(7,920 N/mm² × (1 - 0.30 × 11 / 88)\)

MoE-23% = \(7,920 N/mm² × (1 - 0.1364)\)

MoE-23% = \(7,920 N/mm² × 0.8636\)

MoE-23% =  \(6,836 N/mm²\)

therefore the expected modulus of elasticity at 23% moisture content comes out to be approx \(6,836 N/mm²\).

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Answer:

A incresing speading up

Explanation:

Answer:

1st: Radiation

2nd: Conduction

3rd: Convection

Explanation:

I actually learned this before in school. Yay

An individual white LED (light-emitting diode) with an efficiency of 20% and using 1.0 W of electric power converts only 20% of the electrical energy it receives into light, while the remaining 80% is wasted as heat.

This means that the LED produces 0.2 W of light. Efficiency is calculated by dividing the useful output energy by the total input energy, and in this case, it is 20%. Therefore, for every 1 W of electric power consumed, only 0.2 W is converted into light.

The efficiency of an LED is an important factor to consider when choosing lighting options. LEDs are known for their energy efficiency compared to traditional incandescent bulbs, which waste a significant amount of energy as heat. LEDs convert a higher percentage of electricity into light, resulting in less energy waste and lower electricity bills.

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Answer:

bakit po pano po mag comment sa post not bat di po ako makacomment how po

Explanation:

Answer:The object has negative acceleration and eventually stops.

Explanation:

Answer:not sure

Explanation:

Sorry:(

The work required to compress an initially uncompressed spring with a spring constant of 25 n/m by 10 cm is 0.25 j.

Spring constant is a physical constant related to the stiffness of a spring. It is defined as the ratio of the force applied to the spring to the displacement of the spring. In other words, it is the amount of force required to move the spring by a certain distance, and is measured in units of Newtons per meter (N/m). It is an important parameter in the study of mechanical and physical systems involving springs, and has many practical applications in fields such as engineering, automotive, and robotics.

The work required to compress an initially uncompressed spring with a spring constant of 25 n/m by 10 cm is 0.25 j.

This is calculated by multiplying the spring constant by the distance of compression, i.e. 25 n/m x 0.1 m = 0.25 j.

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The head-to-tail method consists of changing the subtraction of vectors into an addition, where the second vector in the addition will be the opposite vector of the second vector in the subraction:

If vector b is <1, 4>, vector -b is <-1, -4> (we just need to change every signal).

Now, let's draw vector 'a', and in the head of vector 'a' let's start drawing the tail of vector b:

The red vector, which is the sum of 'a' and '-b', is created at the tail of 'a' and finishes at the head of '-b'.

The initial point is (0, 0), and the terminal point is (-4, -9)

If the speed of a fluid increases along a horizontal streamline, the pressure of the fluid decreases.

This phenomenon is described by Bernoulli's principle, which states that as the velocity of a fluid increases, its pressure decreases (and vice versa) when the fluid is incompressible and flowing along a horizontal streamline. This is due to the conservation of energy; as kinetic energy (associated with velocity) increases, potential energy (associated with pressure) must decrease to maintain a constant total energy.

In summary, when the speed of a fluid increases along a horizontal streamline, the pressure of the fluid will decrease, in accordance with Bernoulli's principle.

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The most likely correct about the three stars is: They do not have the same initial mass.

The Chandrasekhar limit is established at a mass where the gravitational field's self-attraction cannot be balanced by the pressure from electron decay.  The limit that has been established these days is 1.39 solar mass.

Hence,  stars of average masses ends by forming white dwarf or neutron star but massive stars ends their life by forming black hole. Hence, They do not have the same initial mass.

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A race car is moving at a constant speed around a track. The race car is changing its velocity as the direction of motion changes.

The primary indicator of an object's position and speed is its velocity. It is the distance that an object travels in one unit of time. The displacement of the item in one unit of time is the definition of velocity.

The rate at which a body's displacement changes in relation to time is known as its velocity. Velocity is a vector quantity with both magnitude and direction. SI unit of velocity is meter/second.

As the race car is moving at a constant speed around a track, the magnitude of velocity remains same but during race it may changes its direction of motion, that is why, velocity of it, which depends on both magnitude and direction, may changes.

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Answer:

85 mph

Explanation:

Divide the distance by time

340/4 = 85 miles per hour

Answer:

85 mph

Explanation:

Speed = distance/time

Speed = 340/4

Speed = 85 mph

A body is in mechanical equilibrium when the (c) sum of the external forces acting on it is zero. This means that the body is not accelerating and its angular velocity is not changing. In other words, the body is in a state of rest or moving with a constant velocity.

When a body is in mechanical equilibrium, the net force acting on it is zero, which means that the body is not accelerating. This is because the body experiences equal and opposite forces that cancel each other out, resulting in a net force of zero.

In addition, when a body is in mechanical equilibrium, the net torque acting on it is zero, which means that the body is not rotating or its angular velocity is not changing. This is because the body experiences equal and opposite torques that cancel each other out, resulting in a net torque of zero.

To summarize, a body is in mechanical equilibrium when the sum of the external forces and the sum of the external torques acting on it is zero. This means that the body is not accelerating and its angular velocity is not changing. A common example of a body in mechanical equilibrium is an object at rest on a flat surface, where the force of gravity is balanced by the normal force exerted by the surface.

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A body is in mechanical equilibrium when

A.it is moving with constant acceleration.

B.it is being moved by a constant force.

C.the sum of the external forces acting on it is zero.

D.the sum of the external torques acting on it is zero.

E.it is moving with constant linear velocity and rotating with a constant angular velocity.

Global trade winds are primarily caused by the interaction of convection in the atmosphere with the spinning of the Earth (option c).

These persistent wind patterns occur due to the uneven heating of the Earth's surface by the Sun, creating pressure differences between the equator and the poles. Warm air at the equator rises, and cooler air from higher latitudes moves in to replace it. As the Earth rotates, the Coriolis effect deflects these winds to the west, creating the trade winds. While factors like the ocean's thermohaline current, changes in the magnetic field, and gravitational pull play roles in various atmospheric processes, it is the combination of convection and Earth's rotation that directly causes global trade winds.

Gases made up Atmosphere I, mostly hydrogen, water vapour, methane, and ammonia. After afterwards, when the planet was being bombarded by asteroids and volcanoes released chemicals like nitrogen and carbon dioxide, our atmosphere began to evolve into atmosphere II. As a result, conditions during stage II of atmospheric evolution were characterised by high levels of water vapour and carbon dioxide.

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Collected data plays a crucial role in evaluating whether the criteria for success have been met. By analyzing the collected data, one can assess the progress made towards achieving the desired goals and determine if the criteria have been fulfilled.

Data provides an objective measure of performance or outcomes, allowing for an evidence-based assessment of success. It helps to quantify and track key metrics or indicators related to the criteria for success. By comparing the actual data with the predetermined benchmarks or targets, one can determine if the criteria have been met or if further improvements are required.

Data analysis also enables the identification of trends, patterns, and correlations, providing insights into the factors influencing success. It helps in identifying areas of strength and areas that need improvement. Additionally, data can be used for comparative analysis, benchmarking against previous periods or similar projects, to gain a broader perspective on success.

In summary, collected data provides an objective basis for evaluating progress and success by comparing actual performance against predetermined criteria, identifying areas of improvement, and gaining insights for future decision-making.

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The total charge is Q= 15.171nC is measured from the center of the rod.

So, the edges of the rod correspond to

x=-6 and x=6.

\(Q= 2\int\limits^6_0 {2exp(-x/6)} \, dx\)

Taking into account that

|x|=-x for x<0

and |x|=x for x >=0

Thus, the total charge is given by:

\(Q= 2\int\limits^6_0 {2exp(-x/6)} \, dx\)

When we integrate, we get:

Q= 24(1- exp(-1))nC ≈ 15.171nC

Density is a fundamental physical quantity that describes the mass of a substance per unit volume. It is typically denoted by the symbol "ρ" and is expressed in units of kilograms per cubic meter (kg/m³) or grams per cubic centimeter (g/cm³).

In simple terms, density can be thought of as how tightly packed the particles of a substance are. A substance with a high density has particles that are tightly packed together, while a substance with a low density has particles that are more spread out.

Density plays a crucial role in many areas of physics, including mechanics, fluid dynamics, and thermodynamics. For example, density is used to calculate the buoyant force on an object in a fluid, which is important in understanding how objects float or sink. It is also used to calculate the pressure and temperature of gases in the atmosphere and the behavior of materials in different physical conditions.

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Answer: Density=0.8

Explanation: It's 0.8 because you are supposed to do m/v=d and that would be 40/50=0.8

Answer:

The density is 0.8 g/cc.

Explanation:

40g/50mL=0.8 g/cc.

0.8 g/cc is equal to 0.8 g/mL.

F = 1520N

explanation:

by newton third law of motion every action has equal and opposite reaction so truck exert on it so F = 1520N

that's my answer

The theory that suggests the Milky Way formed from a large proto-galactic gas cloud is known as the Hierarchical Model or Monolithic Collapse Model of galaxy formation.

According to this theory, the Milky Way and other galaxies formed through the gradual accumulation and collapse of gas clouds in the early universe. It proposes that initially, smaller structures like dwarf galaxies or gas clouds existed. Over time, these smaller structures merged through gravitational interactions, eventually forming larger structures like the Milky Way. In the hierarchical model, the formation of galaxies is a bottom-up process, where small structures merge and accrete matter to form larger and more massive systems. It explains the diverse population and distribution of stars, the presence of globular clusters, and the overall structure of galaxies like the Milky Way.

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C. The magnitude of the acceleration of a planet in an orbit around the sun is proportional to the reciprocal of the distance between the planet and the sun.

The reciprocal of the distance between the planet and the sun ,This is known as Kepler's third law. The farther a planet is from the sun, the weaker the gravitational force between them and the slower the planet's acceleration.
The magnitude of the acceleration of a planet in an orbit around the sun is proportional to: C. The reciprocal of the distance between the planet and the sun.

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The speed is 33.43 m/s and it traveled 189.06 meters in this time.

We can use the equation of motion for an object moving at constant acceleration to determine the speed after 7.50 seconds.

"v = v0 + at" 

where "v" stands for "final speed," "v0" for "starting speed," "a" for "acceleration," and "t" for "time."

The mass and net force can be used to compute the acceleration:

a = F/m = 4.30 x 105 N/3.5 x 10⁵ kg = 1.23 m/s²

Inputting the values into the previous equation results in:

v = 27 m/s + 1.23 m/s² x 7.50 s = 33.43 m/s

After 7.50 seconds, the speed is 33.43 m/s.

b. The following formula can be used to calculate the distance covered during this period of time: d = v0t + (1/2)². 

Thus, in 7.50 seconds, the 747 covered 189.06 meters.

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