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3 years ago

Match these terms with their definitions.

Physics

2 answers:

Tomtit [17]3 years ago

8 0

1. Entropy

2. Thermodynamics

3. First law of thermodynamics

4. Second law of thermodynamics

5. Maximum entropy

6. The kinetic and potential energy of molecules of a substance

adoni [48]3 years ago

7 0

The correct matches are as follows:

1. measure of disorder
entropy

2. the study of energy conversions
thermodynamics

3. conservation of energy when heat is added
second law of thermodynamics

4. disorder increasing
the kinetic and potential energy of the molecules of a substance

5. reaching a state of total disorder
maximum entropy 

6. internal energy
first law of thermodynamics

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You lift a 45-newton bag of mulch 1.2 meters and carry it a distance of 10 meters to the garden. How much

zysi [14]

To lift the bag straight up takes (F · D) = (45 · 1.2) = 54 joules of energy (work).

Moving the bag horizontally 'across' gravity requires no work.
It doesn't matter how far.

4 0

4 years ago

A gas cylinder contains argon atoms (m=40.0 u). The temperature is increased from 286 K (13°C) to 362 K (89°C) (a) What is the c

Rama09 [41]

Answer:

(a). The change in the average kinetic energy per atom is $1.57\times10^{-21}\ eV$ .

(b). The change in vertical position is 2413 m.

Explanation:

Given that,

Mass = 40.0 u

The increased temperature from 286 K to 362 K.

(a). We need to calculate the change in the average kinetic energy per atom

Using formula of kinetic energy

$\Delta K.E=\dfrac{3}{2}k\Delta t$

Put the value into the formula

$\Delta K.E=\dfrac{3}{2}\times1.38\times10^{-23}\times(362-286)$

$\Delta K.E=1.57\times10^{-21}\ eV$

(b). The change in potential energy of the container due to change in the vertical position

We need to calculate the change in vertical position

Using formula of potential energy

$\Delta U=mg\Delta h$

$\Delta h =\dfrac{\Delta U}{mg}$

$\Delta h=\dfrac{1.57\times10^{-21}}{40.0\times1.66\times10^{-27}\times9.8}$

$\Delta h=2412.7=2413\ m$

Hence, (a). The change in the average kinetic energy per atom is $1.57\times10^{-21}\ eV$ .

(b). The change in vertical position is 2413 m.

4 0

4 years ago

A steel column is 3 m long and 0.4 m diameter. It carries a load of 50 MN so that 5.967 mm is elongates more. Find the modulus o

Alex787 [66]

Answer:

$E=2.0*10^{11}N/m^{2}$

Explanation:

Relation between stress and Force:

$\sigma=\frac{F}{A}=\frac{F}{\pi*d^{2}/4}$

Relation between stress and strain:

Young's modulus is defined by the ratio of longitudinal stress σ , to the longitudinal strain ε:

$E=\frac{\sigma}{\epsilon}$

$\epsilon=\frac{\Delta l}{l}$

So:

$E=\frac{F*l}{\pi*d^{2}/4*\Delta l}=\frac{50*10^{6}*3}{\pi*(0.4^{2}/4)*5.967*10^{-3}}=2*10^{11}N/m^2$

8 0

3 years ago

Imagine you are in an open field where two loudspeakers are set up and connected to the same amplifier so that they emit sound w

weeeeeb [17]

Question:

If you are 3.00 m from speaker A directly to your right and 3.50 m from speaker B directly to your left. What is the shortest distance d you need to walk forward to be at a point where you cannot hear the speakers?

Answer:

The shortest distance d you need to walk forward to be at a point where you cannot hear the speakers is 5.625 m

Explanation:

Shortest distance is given by

For constructive interference of wave, we have

$\Delta r_{construct}$ = 2nλ/2

For destructive interference of wave, we have

$\Delta r_{destruct}$ = (2n+1)λ/2

That is the difference in the number of wavelength between constructive and destructive interference is λ/2

We note that our positioning is 3.0 m from the first speaker and 3.5 m from the second, Which is of the form 2n and 2n + 1

Therefore when we walk forward away from the two speakers, we cannot hear the speakers at

Δr = λ/2 = r $_B$ - r $_A$

Which is the distance between the points where we have constructive and destructive interference or where there is destructive interference between the waves

Where:

r $_A$ = Distance from speaker A and

r $_B$ = Distance from speaker B

λ/2 = (344 m/s /688 Hz)/2

= 1/4

For

λ/2 = r $_B$ - r $_A$ we have

√(3.5² +d²) - √(3²+d²) = 1/4

∴ d = 5.625 m

6 0

3 years ago

Explain how the lithosphere, hydrosphere, and atmosphere individually and collectively affect the biosphere. (2 points)

SSSSS [86.1K]

Answer:

The hydrosphere, the sphere of influence that deals with water in its various forms (some separate out ice and call that the cryosphere), provides the biosphere with a much needed component....water. Life would not exist as we know it without water. It places in important role for all organisms, alongside playing an important role in various earth processes.

Explanation:

6 0

3 years ago