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Mama L [17]
3 years ago
6

Which type of reaction is always exothermic? How do you know?

Physics
1 answer:
Marat540 [252]3 years ago
7 0

Answer: Exothermic Reactions

In an exothermic reaction, energy is released because the total energy of the products is less than the total energy of the reactants. For this reason, the change in enthalpy, [latex]\Delta H[/latex], for an exothermic reaction will always be negative.

Explanation: please send a brainleast

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The rainbow of visible colors in the electromagnetic spectrum varies continuously from the longest wavelengths (the reddest colo
Bogdan [553]

Answer:

4.58\times 10^{14}Hz 5.825\times 10^{14}Hz 6.31\times 10^{14}Hz

Explanation:

We know that there is a relation between the speed of light ,frequency and wavelength.This relation can be given as v=\nu \lambda where v is speed of light \nu is frequency of light \lambda is wavelength of light

In first case we have given λ=655 nm

so using formula  v=\nu \lambda

3\times 10^8=655\times 10^{-9}\times \nu

\nu =4.58\times 10^{14} Hz

In second case we have wavelength 515 nm so by using above formula

3\times 10^8=515\times 10^{-9}\times \nu

\nu =5.825\times 10^{14}\ Hz

In third case we have wavelength 475 nm

so 3\times 10^8=475\times 10^{-9}\times \nu

\nu =6.31\times 10^{14}Hz

3 0
4 years ago
If the particle is located slightly to the left of point B, its acceleration is __________.
Igoryamba

(1) directed to the right

Explanation:

To the right of B, u(x) is a decreasing function & so its derivative is negative,this implies that the x component of the force on a particle at this position is positive,or that the force is directed towards right .Small deviations from equilibrium at point B causes a force to accelerate the particle away ,hence particle is in <u>unstable equilibrium.</u>

7 0
4 years ago
Astronomersestimatethata2.0-km-diameterasteroidcollides with the Earth once every million years. The collision could pose a thre
tangare [24]

Answer:

a) 1.6*10^21 Joules.

b) 40,000

Explanation:

part a )

maximum destructive energy that can be released is the case when all the kinetic energy of the asteroid is consumed.

therefore E = 1/2 m v^2

m= density * volume

= 3100* (4/3* pi * 1000^3 ) = 12978666666666.67 kg

given v = 16000m/s

therefore

E= 1/2 * 12978666666666.67 * 16000 * 16000

= 1.6 x 10^21 Joules!

part B)

each bomb is capable of 4 x 10^16 joules

therefore no of bombs that are needed to produce the required energy are

1.6 x 10^21 / 4 x 10^16 = 40,000

that is 40,000 such nuclear bombs are required!

7 0
3 years ago
Read 2 more answers
In diagram B, prove that the tension in the middle string is 3.3 N.
zepelin [54]

Answer:

The tension in the middle string is 3.3 N

Explanation:

Two boxes move with same acceleration

The tension in the middle string is T

Lets start with the forces acting in the 2nd box

→ The tension T in the string in the direction of motion

Due to Newtons's Law

→ ∑ Force in direction of motion = mass × acceleration

→ T = M a

→ M = 1 kg

Substitute the value of M is the equation

→ T = a ⇒ (1)

The force acting on the 1st box

→ The force F in the direction of motion, and T in the string in opposite

   direction of motion

→ F - T = 2M a

→ F = 10 N , M = 1 kg

Substitute These values in the equation

→ 10 - T = 2(1) a

→ 10 - T = 2 a ⇒ (2)

Substitute equation (1) in (2)

→ 10 - T = 2 T

Add T to both sides

→ 10 = 3 T

Divide both sides by 3

→ T = 3.3 N

<em>The tension in the middle string is 3.3 N</em>

7 0
3 years ago
For a particular pipe in a pipe-organ, it has been determined that the frequencies 576 Hz and 648 Hz are two adjacent natural fr
N76 [4]

Answer:

(A) Fo = 72 Hz

(B) The pipe is open at both ends

(C) The length of the pipe is 2.38m

This problem involves the application of the knowledge of standing waves in pipes.

Explanation:

The full solution can be found in the attachment below.

For pipes open at both ends the frequency of the pipe is given by

F = nFo = nv/2L where n = 1, 2, 3, 4.....

For pipes closed at one end the frequency of the pipe is given by

F = nFo = nv/4L where n = 1, 3, 5, 7...

The full solution can be found in the attachment below.

3 0
3 years ago
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