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4 years ago

Matter and energy cycle around our ecosystem, are never being created or destroyed.

Physics

2 answers:

madreJ [45]4 years ago

6 0

Matter and energy cycle around our ecosystem are never being created or destroyed- true

andreyandreev [35.5K]4 years ago

4 0

Answer:

a) True

Explanation:

In a motion there are three things that are conserved, they are called momentum, angular momentum and emery. It is true for all isolated systems.

The conservation of energy principle states that "Energy can neither be created nor be destroyed but it is possible to convert one type of energy into another type of energy."

Based on this principle we can understand that the energy associated with matter is released into ecosystem when it is broken but energy is absorbed back from the ecosystem while binding matter together. The energy absorbed is called (binding energy). The mass itself is a type of energy.

So matter and energy are never being created or destroyed. They are the same since the beginning of universe.

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A sample of an ideal gas is heated, and its kelvin temperature doubles. What happens to the average speed of the molecules in th

BabaBlast [244]

A sample of an ideal gas is heated, and its kelvin temperature doubles. The average speed of the molecules in the sample will increases by a factor of $\sqrt{2}$

The root-mean square (RMS) velocity is the value of the square root of the sum of the squares of the stacking velocity values divided by the number of values. The RMS velocity is that of a wave through sub-surface layers of different interval velocities along a specific ray path.

Root mean square speed is a statistical measurement of speed.

The root mean square speed can be calculated as : V1 : $\sqrt{3 R T / Mo}$

if temperature becomes double

let T1 is initial temperature

So , T2 = 2 * T1

now ,

Root mean square speed will be (V2) = $\sqrt{(3 R (2T)) / Mo}$

= $\sqrt{2}$ * $\sqrt{3 R T / Mo}$

= $\sqrt{2}$ V1

Thus when temperature becomes double, the root mean square speed increases by a factor of $\sqrt{2}$

To learn more about root mean square velocity here

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3 0

1 year ago

The dwarf planet Pluto was discovered in 1930. Since that time, which jovian planet has completed a full revolution around the S

Eva8 [605]

Answer:

Explanation:

Uranus takes about 84 years to circle the sun.

Pluto's existance has been known for 92 years. Uranius has completed 1 complete revolution. The numbers are reasonably close together and so Uranius is the answer.

6 0

3 years ago

Two blocks are on a horizontal frictionless surface. Block a is moving with an initial velocity

AfilCa [17]

The final velocity of the block A will be 2.5 m/sec. The principal of the momentum conversation is used in the given problem.

<h3>What is the law of conservation of momentum?</h3>

According to the law of conservation of momentum, the momentum of the body before the collision is always equal to the momentum of the body after the collision.

In a given concern, mass m₁ is M, mass m₂ is 3M. Initial speed for the mass m₁ and m₂ will be u₁=5 and u₂=0 m/s respectively,

According to the law of conservation of momentum

Momentum before collision =Momentum after collision

m₁u₁+m₂u₂=(m₁+m₂)v

M×5+3M×0=[M+3M]v

The final velocity is found as;

V=51.25 m/s

The velocity of block A is found as;

$\rm V_f=\frac{(m_1-m_2)u_1}{m_1+m_2} +\frac{2m_2u_2}{m_1+m_2} \\\\ V_f=\frac{(M-3M)5+2\times3M\times0}{m_1+m_2} \\\\ V_f=2.5 m/s$

Hence, the final velocity of the block A will be 2.5 m/sec.

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5 0

3 years ago

speed of sound is 343 Ms at 20 degrees Celsius. The frequency heard from the sound is 256 Hz. what is the sounds wavelength?

Lina20 [59]

S= 343m/s
F=256Hz

WL= 343ms/256-1
WL=V/F

= 1.339844m

7 0

3 years ago

From a window 20 feet above the ground, the angle of elevation to the top of a building across the street is 78°, and the angle

Papessa [141]

The answer would be 371.16 ft.

Refer to the diagram for the scenario. The drawing is not to scale.

Notice the diagram that you will find to adjacent right triangles. All you need to do is first solve for the needed side of one triangle, by using one side.

It sounds confusing I know, but let's do this step by step.

Angle of depression is 15°.

We use this first because we do not have enough data to use the angle of elevation.

To get the adjacent side, we use the trigonometric function TOA which means:

$tan\theta= \dfrac{opposite}{adjacent}$

We use the height of the first building as our reference, so our given will be:

Opposite = 20ft

θ = 15°

Now we put that into our formula:

$tan\theta= \dfrac{opposite}{adjacent}$

$Tan15 = \dfrac{20ft}{adjacent}$

$adjacent = \dfrac{20ft}{Tan15}$

Adjacent = 74.64 ft

Angle of elevation is 78°:

Now that we have that we can solve for the height from the point of 20ft. We use the same formula, because we are looking for the opposite, given the adjacent.

$tan\theta= \dfrac{opposite}{adjacent}$

$Tan78 = \dfrac{opposite}{74.64ft}$

$(74.64ft)(Tan78) = opposite$

351.16ft = Opposite

Now that's the height from the top of the first building. To get the total height of the building we just add the 20ft.

351.16ft + 20 ft = 371.16ft

<em>The building across the street is 371.16 ft tall.</em>

5 0

3 years ago