Un trozo de hielo de 70 g se introduce en 450 g de agua a 23 ºC. ¿Cuál es la temperatura final de equilibrio suponiendo que no hay intercambio de calor entre el sistema y el ambiente?

Answer:

when the direction of the Current changes.

Explanation:

Electromagnet refers to an iron ore wrapped around with a coil of wire, in presence of electric current. As it acts like a magnet, when current is passed through it.

The north & south poles of magnetic fields produced by such magnet, change with direction of current passed through it.

Answer:

current

Explanation:

edge2021

Explanation:

I believe it is b or c. most likely b

Answer:

The scale read 1280 N.

Explanation:

Given that,

The mass of a person, m = 80 kg

We need to find the scale reading when the elevator is moving upward at 6.2 m/s².

We know that, when an elevator moves up, the reading on the scale is given by :

N-mg=ma

N=m(a+g)

Put all the values,

N = 80(6.2+9.8)

= 80(16)

= 1280 N

Hence, the scale read 1280 N.

Answer:

The speed of light in glycerol is 2.04×108 m/s .

Explanation:

The speed of light in glycerol will be 2.03 ×10⁷ m/sec. The speed of light is found as the ratio of the speed of light in air and the refractive index.

The level of bending of a light beam as it goes from one medium to another is known as the refractive index of the medium.

The frequency of the wave is given as;

[tex]\rm f = 5.09 \times 10^{14} Hz[/tex]

The refractive index of ethyl alcohol is n=1.4722

The substance's index of refraction yields the ratio of light speed in a vacuum to light speed in that medium, the speed of light is sound as;

[tex]\rm n = \frac{C}{v} \\\\ \rm v = \frac{C}{n} \\\\ \rm v = \frac{3 \times 10^8}{1.4722} \\\\ v= 20377660.00\ m/sec \\\\ v= 2.03 \times 10^7 m/sec[/tex]

Hence, the speed of light in glycerol will be 2.03 ×10⁷ m/sec.

To learn more about the refractive index, refer to the link;

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Answer: Alternative D.

------------------------------------------------

To calculate the gravitational weight of other planets, the formula is used:

[tex]\large\boxed{{\mathbf{P = m \cdot g}}}[/tex]

Data:

Mass(m): 1000 N

Gravity(g): 0.61

Weight(p): ?

We replace data:

P = m × g

P = 1000 N × 0.61

P = 610 N

Result: Its weight on Pluto will be 610 Newtons (Alternative D).

Explanation:

p = mv ---> let v --> 2v (velocity is doubled) then

p' = m(2v)

= 2(mv)

= 2p

so the momentum also doubled

Answer:

A) but be sure and read the answer.

Explanation:

If the object does not move at all, (that's an important restriction) the net force = 0. That being so, the acceleration must be 0 as well. But there is no law saying that there cannot be a constant motion and that's why the restriction is important.

Answer:

A: For each 1 degree Celsius that temperature decreases, the speed of sound decreases by 0.6 m/s. So sound travels through dry, -20 °C air at a speed of 319 m/s

Explanation:

Answer:

The acceleration of the bowling ball is

1.875 m/s2

Answer:

Explanation:

Given the following data;

Initial volume = 2.5 L

Initial temperature = 350 K

Final volume = 2V1 = 2*2.5 = 5 L

To find the final temperature, we would use Charles law;

Answer:

When an object moves in a straight line at a steady speed, we can calculate its speed if we know how far it travels and how long it takes. This equation shows the relationship between speed, distance traveled and time taken: Speed is distance divided by the time taken.

Explanation:

Thats what goog.le said so if its wrong blame G O O G L E

Answer:

This is to optimize storage and transport.

Explanation:

Answer:

4 CM

Explanation:

The dotted car means thats were it started, the car to the right is were it stops. count the lines from the start of the dotted car to the start of the shaded car. hope that helped!

Answer:

105

Explanation:

Trust brother

Answer:

v = 16.98 km/s

Explanation:

Given that,

Distance, d = 4500 km

Time, t = 265 s

We need to find its average speed. The total distance covered divided by total time taken is called average speed of an object. So,

[tex]v=\dfrac{4500\ km}{265\ s}\\\\=16.98\ km/s[/tex]

So, the average speed is 16.98 km/s.

Answer:

Sufrirá una deflección en su recorrido.

Explanation:

Las partículas alfa son nucleos de He (dos protones mas dos neutrones), por lo tanto tienen una carga neta positiva.

Ahora, al acercarse al nucleo de un átomo con muchos protones y con baja energía, la partícula alfa sufrirá una deflección en su recorrido debido a las fuerzas de repulsión electrostática que siente la partícula, ya que el nucelo posee caraga positiva.

Espero te haya sido de ayuda.

Answer:

608.9 nm

Explanation:

trust me cutie

The wavelength of light in nanometers is 0.017 x [tex]10^{3}[/tex] nm.

We have -

d = [tex]2.25\times 10^{-6}[/tex]

n = 1 = order

θ = 15.7 degrees

We have to calculate the wavelength of light (λ) in nanometers.

Diffraction is defined as the bending or spreading of light waves as it passes through the edge of an object or through a small slit (size of slit should be very very less then wavelength of light) is called diffraction.

According to the question, we can use the following relation to calculate wavelength as -

d sinθ = nλ

λ = [tex]\frac{dsin\theta}{n}[/tex]

λ = d sinθ               (since n = 1)

λ = [tex]2.25\times 10^{-6}[/tex] x sin (15.7)

λ = 0.0079 x 2.25 x [tex]10^{-6}[/tex]

λ = 0.0177 x [tex]10^{-6}[/tex] m

We know that -

1 nanometer = [tex]10^{-9}[/tex] m

1 m = [tex]\frac{1}{10^{-9} }[/tex]

0.017 x [tex]10^{-6}[/tex] m will be equal to = [tex]\frac{0.017\times 10^{-6} }{10^{-9} }[/tex] = 0.0177 x [tex]10^{3}[/tex] nm

Hence, the wavelength of light in nano meters is 0.0177 x [tex]10^{3}[/tex] nm.

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Answer:

The value of R₂ is equal to 24.75 ohms.

Explanation:

Given that,

Two resistors, R₁ and R₂, are  connected in parallel.

The equivalent resistance is 14.5 ohms

We need to find the value of R₂.

When two resistors are connected in parallel. The equivalent resistance is given by :

[tex]\dfrac{1}{R_{eq}}=\dfrac{1}{R_1}+\dfrac{1}{R_2}\\\\\dfrac{1}{14.5}=\dfrac{1}{35}+\dfrac{1}{R_2}\\\\\dfrac{1}{R_2}=\dfrac{1}{14.5}-\dfrac{1}{35}\\\\\dfrac{1}{R_2}=0.04039\\\\R_2=\dfrac{1}{0.04039}\\\\R_2=24.75\ \Omega[/tex]

So, the value of R₂ is equal to 24.75 ohms.

Answer:

Height, h = 50 meters.

Explanation:

Given the following data;

Mass = 20kg

Potential energy = 10,000 J

Acceleration due to gravity, g = 10m/s²

To find the height of the box;

Potential energy can be defined as an energy possessed by an object or body due to its position.

Mathematically, potential energy is given by the formula;

[tex] P.E = mgh[/tex]

Where,

Substituting into the formula, we have;

10000 = 20*10*h

10000 = 200h

Height, h = 10000/200

Height, h = 50 meters.

Answer:

29.7 m/s fast, velocity is 29.7 m/s

Explanation:

Applying,

v² = u²+2gs...................... Equation 1

Where v = final velocity, u = initial velocity, g = acceleration due to gravity, s = distance.

Given: u = 0 m/s (dropped from height), s = 45 m

Constant: g = 9.8 m/s²

Substitute these values into equation 1

v² = 0²+2×9.8×45

v² = 882

v = √(882)

v = 29.7 m/s.

Hence the stone will be moving 29.7 m/s fast and the velocity is also 29.7 m/s

Answer:  

At point 3, the reactants and products reach their equilibrium concentrations.

At point 1 the reaction proceeds mostly in the forward direction.

Explanation:

Answer:

"h" signifies Planck's constant

Explanation:

In the equation energy E = h X v

The "h" there signifies Planck's constant

Planck's constant is a value, that shows the rate at which the energy of a photon increases/decreases, as the frequency of its electromagnetic wave changes.

It was named after Max Planck who discovered this unique relationship between the energy of a light wave and its frequency.

Planck's constant, "h" is usually expressed in Joules second

Planck's constant = [tex]6.62607015 \times 10^{-34} J.s[/tex]

Answer: The motion of the object will remain the same

Explanation:

Answer:

44.44 seconds

Explanation:

You just do 1200/27

Answer:

1. 30,000 Kelvin, or 53,540 Farenheit, or 29,726 Celcius

2. i'm not sure, I'm sorry. I know that there are several, and one of them is helium.

3. This fusion changes the inner composition of the star, eventually it becomes a red giant or supergiant

Explanation:

Hope this helps :)