7. Two objects in thermal equilibrium have -
O the same energy
O the same temperature
O different energy
O different termperatures

Answer:

Fluid theories of electricity are outdated theories that postulated one or more electrical fluids which were thought to be responsible for many electrical phenomena in the history of electromagnetism.

I hope it's helpful!

Answer: If mass remains constant and you double the force you will double the acceleration.

When the outward-directed gas pressure (created by thermal nuclear energy) is balanced in a stable relationship with inward-directed gravitational force results in main sequence star.

The pressure is the force exerted per unit area.

A main sequence star fuses hydrogen in its core and has balanced outward pressure from core nuclear fusion and gravitational forces will be pushing inward.

When the outward-directed gas pressure is balanced in a stable relationship with inward-directed gravitational force results in main sequence star.

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Answer:

Answer:

Acceleration

Explanation:

plato

The speed of the spaceship is 0.099c.

Speed is the fastest movement of something.

Given:

L = 30 m is the proper length of the ship

• Delta*L = 13.8cm = 0.13m is the change in length

Let us first determine our contracted length. We can do this by subtraction:

L = 30m - 0.13m

We get:

L = 29.87

Now to determine the speed of the ship, we use the length contraction equation:

L = L_{0} * √(1 - (v ^ 2)/(c ^ 2))

We isolate the square root term:

√(1 - (v ^ 2)/(c ^ 2)) = L/L_{0} To simplify calculations, let us first substitute our lengths:

√(1 - (v ^ 2)/(c ^ 2)) = (29.87/(30) =

= 0.995

After calculation

V/C = 0.099874

Or V= 0.099c

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Because infrared light extracts energy from the paint whereas desk lamp light does not.

Energy's "ability to accomplish labor" refers to its ability to exert a force that moves an item. Despite the vagueness of the phrase, energy actually refers to the force which moves objects. The two types of energy are energy and potential energy.

Nearly majority of the world's energy is produced by steam turbines using carbon fuels, nuclear energy, biofuels, thermal, etc solar thermal energy. Solar photovoltaics, wind turbines, water turbines, gas turbines, and other important electricity generation technologies.

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Answer:

the ansewer is C

Explanation:

The coefficient of static friction between the book and the tabletop can be determined using the equation:
Coefficient of static friction = Force to start sliding / Normal force.

In this case, the force to start sliding is 2.11 N and the weight of the book can be calculated using the equation:
Weight = mass x acceleration due to gravity.
Given that the mass of the book is 1.89 kg and the acceleration due to gravity is 9.8 m/s^2, the weight of the book is approximately 18.522 N.
Since the book is resting on the tabletop, the normal force acting on it is equal to the weight of the book.
Therefore, the coefficient of static friction can be calculated as:
Coefficient of static friction = 2.11 N / 18.522 N.
This simplifies to approximately 0.114.
Hence, the coefficient of static friction between the book and the tabletop is approximately 0.114.

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Answer:

The  reflected spot will appear to be closer than when  the aquarium was empty.

N1 sin θ1 = N2 sin θ2         N1 is in air and equals 1, N2 is greater than one

θ2 is measured from the vertical and the ray is less than θ1

The distance to spot is less so it appears closer

(Consider a spot directly below the pointer    L1 = N2 L2)

If N2 = 4/3 then L2 would be 3/4 L1

Answer:

\( \boxed{\sf Focal \ length = 10 \ cm} \)

Given:

Radius of curvature (R) of a spherical mirror = 20

To Find:

Focal length (f)

Explanation:

Formula:

\( \boxed{ \bold{\sf Focal \ length \ (f) = \frac{Radius \ of \ curvature \ (R)}{2}}}\)

Substituting value of R in the equation:

\( \sf \implies f = \frac{20}{2} \)

\( \sf \implies f = \frac{ \cancel{2} \times 10}{ \cancel{2}} \)

\( \sf \implies f = 10 \: cm\)

Focal length = 10 cm.

Solution :

Given radius of curvature = 20 cm.

Formula :

Focal length = Radius of curvature/2

→ Focal length = 20/2

→ Focal length = 10 cm.

Answer : 10 cm.

Answer:

E= 600 W

Explanation:

Given that

m = 2 kg

Speed ,  v= 10 m/s

Force , F= 60 N

Given that box is moving with constant velocity, it means that friction force will be 60 N.

f = 60 N

Therefore total energy generated

E= f x v

E= 60 x 10 = 600 W

E= 600 W

Thus the answer will be 600 W.

The correct answer is e. None of the above alternatives gives a true statement. None of the statements in options a, b, c, and d are true when it comes to a modulus M over a ring R having a finite basis.

When a modulus M can be formed entirely from a finite set of elements, the modulus M is said to be finitely generated. M's finite basis does not, however, automatically imply that M is finitely generated. A basis is a set of linearly independent elements, and it might not be enough to produce all of the components of the modulus.

According to the assertion in option b, M must include nonzero items of nonzero order if it has a finite basis. This is untrue, though. The smallest positive number k, such that the element raised to the power of k equals the identity element, is referred to as the order of an element.

According to option c, every non-null element in a modulus with a finite basis has a null. Nevertheless, this claim is likewise untrue. It is possible for a modulus with a finite basis to have non-null elements without a null element.

According to option d, a ring R is a body, or a field, and only then can a modulus have a finite basis. However, this assertion is also untrue. Even though the ring R is not a field, a modulus can nonetheless have a finite basis. None of the given alternatives provides a true statement about a modulus M over a ring R having a finite basis.

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Answer:

20 m/s

Explanation:

Acceleration = Change in velocity/ time

4 = Change in Velocity/ 5

Change in velocity = 20 m/s

Answer:

left brain the left brain is your rapid more irrisponsibe side while your right cortex thinks about the potential outcomes

The average distance between the sun and Mars is 1.5 astronomical units (AU). 1 astronomical unit is the average distance between the earth and the sun, and it is equal to 149,597,870.7 kilometers.The speed of light is 299,792 kilometers per second.

The distance between the sun and Mars is, therefore, 1.5 * 149,597,870.7 kilometers = 224,396,806 kilometersTo determine how long it takes for light to travel that distance, we must divide the distance by the speed of light as follows;224,396,806/299,792 = 748.1 secondsIt takes about 748 seconds or 12.47 minutes for light to travel from the sun to Mars. Therefore, it takes 12.47 minutes for light to get to Mars from the Sun.

This question requires some calculations. We need to determine the distance between the sun and Mars and then divide it by the speed of light to determine how long it takes for light to travel that distance.Earth is 1 astronomical unit from the Sun, and light covers that distance in 8.3 minutes.

Mars is 1.5 astronomical units from the Sun, and we are to determine how long it takes for light to get to Mars from the Sun.1 astronomical unit is the average distance between the earth and the sun, and it is equal to 149,597,870.7 kilometers. Therefore, the distance between the sun and Mars is 1.5 * 149,597,870.7 kilometers = 224,396,806 kilometers. This is the distance that light has to travel from the Sun to Mars.

To determine how long it takes for light to travel that distance, we divide the distance by the speed of light as follows;224,396,806/299,792 = 748.1 secondsIt takes about 748 seconds or 12.47 minutes for light to travel from the sun to Mars. Therefore, it takes 12.47 minutes for light to get to Mars from the Sun.

It takes 12.47 minutes for light to get to Mars from the Sun.

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The work performed by Sean is 32.14 J.

Work can be defined as the product of force and distance. The S.I unit of work is Joules (J)

To calculate the amount of work performed by Sean, we use the formula below.

Where:

From the question,

Given:

Substitute these values into equation 1

Hence, The work performed by Sean is 32.14 J.

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The relationship between Linear Expansivity and Cubic Expansivity is as follows: Cubic / Volume expansivity = 3 Linear expansivity

Now, consider a sheet of metal of Length (l), Breadth (b), and Height (h). Let the initial Length be (l₁), the initial Breadth be (b₁) and the initial Height be (h₁). Let the final Length be (l₂), the final Breadth be (b₂) and the final Height be (h₂) after the metal is heated through a temperature change of θ.

Considering,

the initial volume of the metal be V₁ = l₁*b₁*h₁

and, the final volume of the metal be V₂ = l₂*b₂*h₂

Then,

Using the formula of linear expansivity,

l₂ = l₁ (∝∆θ + 1 )

b₂ = b₁ (∝∆θ + 1 )

h₂ = h₁ (∝∆θ + 1 )

Remember that Volume = l * b*h

Therefore,

V₁ = l₁*b₁*h₁

V₂ = l₂*b₂ *h₂

V₂ =l₁ (∝∆θ + 1 ) * b₁ (∝∆θ + 1 ) * h₁ (∝∆θ + 1 )

V₂ = l₁* b₁*h₁ (∝∆θ + 1 ) * (∝∆θ + 1 ) * (∝∆θ + 1 )

V₂ = l₁* b₁*h₁ ((∝∆θ * (∝∆θ + 1 ) + 1 * (∝∆θ + 1 ) ) * (∝∆θ + 1 )

Let's open the brackets, now we get,

V₂ = l₁* b₁*h₁(∝²(∆θ)² + ∝∆θ + ∝∆θ + 1 ) * (∝∆θ + 1 )

V₂ = l₁* b₁*h₁(∝²(∆θ)² + 2∝∆θ +1 ) * (∝∆θ + 1 )

V₂ = l₁* b₁*h₁(∝²(∆θ)² * (∝∆θ + 1 ) + 2∝∆θ * (∝∆θ + 1 ) +1* (∝∆θ + 1 ) )

V₂ = l₁* b₁*h₁(∝³(∆θ)³ +∝²(∆θ)² + 2∝²(∆θ)² + 2∝∆θ +∝∆θ + 1 )

V₂ = l₁* b₁*h₁(∝³(∆θ)³ +∝²(∆θ)² + 2∝²(∆θ)² + 3∝∆θ + 1 )

V₂ = V₁(∝³(∆θ)³ + 2∝²(∆θ)² + 3∝∆θ+1 )

Remember that ,

V₂ = V₁ ( ϒ * ∆θ + 1 )

Let us substitute for V₂ in the above formula. Then we will get,

V₁ ( ϒ * ∆θ + 1 ) = V₁(∝³(∆θ)³ + 2∝²(∆θ)² + 3∝∆θ+1 )

ϒ * ∆θ + 1 = ∝³(∆θ)³ + 2∝²(∆θ)² + 3∝∆θ+1 (V₁ canceled V₁ and the brackets are removed)

ϒ * ∆θ = ∝³(∆θ)³ + 2∝²(∆θ)² + 3∝∆θ ( 1 cancelled 1 )

At this point,∝ tends to be zero because its value starts from 0.0000... Upward. Therefore,∝² and ∝³ are approximately zero. i.e. ∝² and ∝³ are = 0.

Therefore, we put zero in place of ∝² and ∝³. Now we get,

ϒ * ∆θ = 0*(∆θ)³ + 2*0*(∆θ)² + 3∝∆θ

ϒ * ∆θ = 0 + 0 + 3∝∆θ

ϒ * ∆θ = 3∝∆θ

ϒ = 3∝ ( ∆θ cancelled. ∆θ )

Therefore,

Cubic / Volume expansivity = 3 Linear expansivity

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Diffraction is the change in a wave's direction as it travels around barriers. Diffraction is observed in both light and sound waves. This means that options 1 and 2 are wrong.

For any opening or slit, waves with longer wavelengths bend more than waves with shorter wavelengths. If the wavelength is smaller than the opening, it would be difficult for diffraction to occur. Thus, the correct option is

It occurs best when the slit width is less than the wavelength of a wave.

Mechanical power that the engine deliver if it absorbs 1.60 ✕ 105 J of energy each second from the hot reservoir is calculated as  6.72 kW.

The Carnot engine is a theoretical thermodynamic cycle that estimates maximum possible efficiency that heat engine during the conversion process of heat into work and working between two reservoirs can possess.

As we know that, E c = 1 - Tc/ Th

=1− (2143.15/703.15)

​=0.672

=67.2%

(b) The output power of engine is given as : P= W Eng./ Δt

So, P= c ∣Qh∣ / Δt

= 0.42 * 1.60 ✕ 10⁵/1

Therefore, Mechanical power that the engine delivers = 6.72 * 10³W

= 6.72 kW

​

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Answer:

c. divides by 4 the gravitational force between them

Explanation:

Newton's law of gravity says:

 F1 = G(m1*m2)/r^2

where G is the gravitational constant, m1 and m2 are the masses of objects 1 and 2, and r is the distance between the two masses.

Doubling the distance would result in:

The new distance would be = 2r

F2 = G(m1m2)/(2r)^2

F2 = G(m1m2)/4r^2

F2 = (1/4)(G(m1m2)/r^2)

F2 = (1/4)F1

The new force, F2, at twice the distance is 1/4 that of the original force, F1.

The sample will move very slowly in the opposite direction of the applied magnetic field, but it will eventually come to a stop when it reaches equilibrium.

Diamagnetic materials, unlike ferromagnetic or paramagnetic materials, do not possess any permanent magnetic moment or net magnetic dipole moment. The magnetic force acting on the diamagnetic material is perpendicular to its velocity, and hence it cannot accelerate the material along the direction of the magnetic field.

Since the sample is made of diamagnetic material, it will have a very weak and temporary magnetic moment induced in it when placed in a magnetic field. This induced magnetic moment will be in the opposite direction to the applied magnetic field. Therefore, the sample will experience a force in the direction opposite to the applied magnetic field. However, this force will be very weak since the diamagnetic material has a weak magnetic susceptibility.

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A pure liquid in a distilling flask doesn't vaporize all at once because of its vapor pressure. The temperature of a liquid determines its vapor pressure. At higher temperatures, the vapor pressure of a liquid increases. When a pure liquid is heated in a distilling flask, its temperature increases, resulting in a rise in vapor pressure.

However, the vapor pressure is only equivalent to atmospheric pressure at the boiling point of the liquid. If the boiling point of the liquid is equal to or lower than the temperature of the distilling flask, the liquid will boil and vaporize, and the distillate will accumulate in the receiving flask. Based on the aforementioned discussion, the temperature of the liquid continues to rise when the temperature of the distilling flask is increased. This, in turn, causes the vapor pressure of the liquid to rise as well. When the vapor pressure of the liquid rises above atmospheric pressure, the liquid begins to boil.

However, the boiling point of a liquid is dependent on its atmospheric pressure. If the atmospheric pressure is lower, the boiling point of the liquid decreases, and if the atmospheric pressure is higher, the boiling point of the liquid increases. Furthermore, if the atmospheric pressure is lower than the vapor pressure of the liquid at a specific temperature, the liquid would evaporate completely. As a result, a pure liquid in a distilling flask does not vaporize all at once because it is boiling at a temperature less than the atmospheric pressure.

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Answer:

8.5 Ω

Explanation:

La resistencia de un material es directamente proporcional a su longitud e inversamente proporcional al área de la sección transversal.

La fórmula de la resistencia (R) viene dada por:

R = ρL/A

Donde ρ es la resistividad del material, L es la longitud del material y A es el área de la sección transversal del material.

Dado que:

L = 1 km = 1000 m, A = 2 mm² = 2 * 10⁻⁶ m², ρ (cobre) = 1.7 * 10⁻⁸ Ωm

Sustituyendo da:

R = 1,7 * 10⁻⁸ * 1000/2 * 10⁻⁶

R = 8.5 Ω

Reflection allow us to see object indirectly when the light on the is reflected in our eyes and refraction is responsible for focusing light on our retina.

The  reflection, refraction, and absorption play significant roles in the way we see things.

Reflection : Reflection occurs when flight shines on a smooth , shiny surface and the light bounce back or the waves reflect in a predictable manner.  Reflection allow us to view object indirectly when the light on the is reflected in our eyes.

Refraction ; Refraction refers to bending of light waves as it passes through various medium with different densities.

The bending of light through refraction reveals the way we view bent pencils that is partially immersed in water.

Absorption: Absorption occur when light is absorbed rather than been reflected or transmitted. Different materials has various abilities for absorbing light and they have various wavelengths. For example, black objects absorbed light than other objects.

In summary, Reflection allow us to see object indirectly when the light on the is reflected in our eyes and refraction is responsible for focusing light on our retina.

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Answer:

To absorb heat

Explanation:

A black color is said to absorb much heat . This helps in cooling the engine as the radiator has absorbed the heat efficiently .

Additional Information:

Answer:

Answer is (C)

Explanation:

For acceleration

• If the motion is vertically, then acceleration is 9.8 m/s²

» Upward motion, acceleration is negative (-9.8)

» Downward motion, acceleration is positive (+9.8)

For velocity

\({ \rm{v = u + gt}} \\ { \rm{v = 20 + ( - 9.8 \times 4)}} \\ { \rm{v = - 19.2 \: m {s}^{ - 1} }}\)

Answer:

NaHCO3 + CaCl2 = CaCO3 + 2NaCl + H2O

Explanation:

It is physically impossible to balance this equation you may be missing another compound