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3 years ago

Under what condition will the enthalpy change of a process equal the amount of heat transferred into or out of the system?

Physics

1 answer:

olga55 [171]3 years ago

3 0

Answer:

At constant pressure

Explanation:

Enthalpy of a system may be defined as the system's internal energy in addition to the product of the volume and pressure of the system.

It can be regarded as the system's capacity of heat transfer and to do non- mechanical work.

The enthalpy of the system at constant pressure gives the amount of heat or energy that is either absorbed by the system or released by the system.

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An especially violent lightning bolt has an average current of 1.89 x 103 A lasting 0.133 s. How much charge is delivered to the

Rasek [7]

<h2> Charge = 25.9 $Ampsec^{-1}$ </h2>

Explanation:

Given,

The average current (I) = ${1.89} \times {103 A}$ and

Time period (T) = 0.133 s

The charge is calculated by multiplying the current to the time period.

Hence,

To find, the charge delivered to the ground by the lightning bolt(Q) = ?

By applying the formula of charge that is-

Charge(Q) = $Current(I) \times Time(T)$

∴ Charge(Q) = ${1.89} \times {103 A}$ $\times 0.133 s$

= 25.89111 $As^{-1}$

= 25.9 $As^{-}$

<h3>Thus, the charge of 25.9 $Ampsec^{-1}$ is delivered to the ground by the lightning bolt.</h3>

3 0

4 years ago

To understand the relationships between the parameters that characterize a wave. It is of fundamental importance in many areas o

Monica [59]

Answer:

1) c.

2) a.)

Explanation:

At any wave, if its waveform repeats itself every time interval T, it is said that the wave is periodic, with a period T, which is the time needed to complete an entire cycle. The other options refer at the way in the waves propagates (longitudinal or transversal) and to the type of waveform (sinusoidal), so the right answer is c).

At any wave that propagates at a constant speed, there exists a fixed relationship between the velocity v, the frequency f and the wavelength λ, as follows:

$v = \lambda * f (1)$

So in order to v keep constant, if the frequency is increased, the wavelength will decrease in the same proportion, so a) is the right answer.

7 0

3 years ago

how to control stage fear or get rid of it ( please help me or share ur experience that how u got rid of it )

stira [4]

I have that problem, the only thing that helps me is to look at someone I know, like my parents or my sister or grandma etc. and don't think about what other people might think about you.
So good luck.

I hope this helps you.

7 0

3 years ago

The same book with a mass of 3 kg is now at rest on a bookshelf 5 meters above the ground. What is the book’s kinetic energy?

RoseWind [281]

Answer:

0 J

Explanation:

Since the book is at rest then its velocity will be zero therefore

K.E=

$\frac{1}{2} m {v}^{2}$

since v=0

then

K.E= 0

6 0

3 years ago

Starlight is released during which nuclear reaction?

Likurg_2 [28]

Answer:

D. Nuclear fusion

Explanation:

Nuclear fusion is a nuclear reaction where nuclei of atoms( one of low atomic number and another with a higher atomic number) join together to form a much bigger nucleus and release a lot of energy.In the sun, which is a star of course, where light is released,hydrogen is converted to helium and the process releases massive energy into space in form of heat and light.

6 0

4 years ago

Read 2 more answers