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4 years ago

An atom has 1.5x10^19 free electrons.

1 answer:

4 0

An atom that has 1.5x10^19 free electrons will have a negative charge since these free electrons carry a negative charge on them. The charge of one electron is -1.6 X 10-19 Coulombs. Hope this answers the question. Have a nice day.

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When an aluminum bar is connected between a hot reservoir at 860 K and a cold reservoir at 348 K, 2.40 kJ of energy is transferr

Natalija [7]

Answer:

a) $\Delta S_{in} = 2.791\,\frac{J}{K}$ , b) $\Delta S_{out} = 6.897\,\frac{J}{K}$ , c) $S_{gen} = 4.106\,\frac{J}{K}$ , d) Due to irreversibilities due to temperature differences.

Explanation:

a) The change in entropy of the hot reservoir is:

$\Delta S_{in} = \frac{2400\,J}{860\,K}$

$\Delta S_{in} = 2.791\,\frac{J}{K}$

b) The change in entropy of the cold reservoir is:

$\Delta S_{out} = \frac{2400\,J}{348\,K}$

$\Delta S_{out} = 6.897\,\frac{J}{K}$

c) The total change in entropy of the Universe is modelled after the Second Law of Thermodynamics. Let assume that process is steady:

$\Delta S_{in} - \Delta S_{out} + S_{gen} = 0$

$S_{gen} = \Delta S_{out} - \Delta S_{in}$

$S_{gen} = 6.897\,\frac{J}{K} - 2.791\,\frac{J}{K}$

$S_{gen} = 4.106\,\frac{J}{K}$

d) Since irreversibilities create entropy as process goes by. The main source of irreversibilities is the existence of temperature differences.

6 0

3 years ago

If you're driving 55 MPH and you suddenly need to stop, how many feet will you travel before the car comes to a stop

lys-0071 [83]

ANSWER: 170 Feet
REASON: with good breaks and a dry road your car should stop and skip 170 feet, with perception and reaction time of stopping you should stop within 170 feet

5 0

3 years ago

The slope of the following graph represents

guajiro [1.7K]

Answer:

ok jsjajakaka you can come to me when you get home can you please send me the details of the day and I will be there at this time of year is the best way to get a hold of the guy who was the guy who was the guy who was the guy who was the guy who was the guy that was the only thing that was the case but I don't know if I can help you

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3 years ago

Tarzan swings on a 36.0 m long vine initially inclined at an angle of 31.0◦ with the vertical. The acceleration of gravity if 9.

aleksandrvk [35]

Answer:

v = 10 m/s

Explanation:

Given,

Length of the vine, l = 36 m

Angle of inclination = 31.0◦ with the vertical

acceleration due to gravity = 9.81 m/s²

Using Conservation of energy

KE = PE

$\dfrac{1}{2} mv^2 = m g h$

$v = \sqrt{2gh}$

$v = \sqrt{2 g l(1-\cos \theta)$

$v = \sqrt{2\times 9.81\times 36 \times (1-\cos 31^0)$

v = 10 m/s

Hence, the speed of the swing is equal to 10 m/s

7 0

3 years ago

HELP!!

Maru [420]

In exothermic/exergonic reactions, reactants have greater energy(Gibbs-Free Energy) than the products. This energy determines how much mechanical work a system can do

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3 years ago