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3 years ago

The entropy of an isolated system must be conserved, so it never changes.a. Trueb. Fasle

Physics

1 answer:

Snowcat [4.5K]3 years ago

6 0

Answer:

B: False

Explanation:

The second law of thermodynamics states that: the entropy of an isolated system will never decrease because isolated systems always tend to evolve towards thermodynamic equilibrium which is a state with maximum entropy.

Thus, it means that the entropy change will always be positive.

Therefore, the given statement in the question is false.

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Using a simple machine, a student is able to lift a 500N weight by applying only 100N.

NISA [10]

The mechanical advantage of a machine is the ratio between the output force and the input force:
$MA= \frac{F_O}{F_I}$
In our problem, the input force is 100 N, while the output force is the weight of the object the student lifts, 500 N. So, the mechanical advantage is
$MA= \frac{500 N}{100 N}=5$

7 0

4 years ago

Estimate the Joule-Thomson coefficient of refrigerant-134a at 0.70 MPa and 50°C. Assume the second state will be selected for a

leva [86]

Answer:

$\mu = 0.018\,\frac{^{\textdegree}C}{kPa}$

Explanation:

The Joule-Thomson coefficient is the ratio of the change of temperature to the change of pressure under isoenthalpic conditions:

$\mu = \left(\frac{\Delta T}{\Delta P}\right)_{h}$

Initial and final properties are:

$T_{1} = 50^{\textdegree}C, P_{1}=700\,kPa, h_{1}=288.54\,\frac{kJ}{kg}$ . Superheated Vapor.

$T_{2} = 48.186^{\textdegree}C, P_{2}=600\,kPa, h_{2}=288.54\,\frac{kJ}{kg}$ . Superheated Vapor.

The Joule-Thomson coefficient is approximately:

$\mu = \frac{50^{\textdegree}C-48.186^{\textdegree}C}{700\,kPa-600\,kPa}$

$\mu = 0.018\,\frac{^{\textdegree}C}{kPa}$

5 0

4 years ago

What times what equals 400

Radda [10]

If you're willing to consider fractions or decimals,
then there are an infinite number of answers.
Like (2.5 x 160), and (15 x 26-2/3).

If you want to stick to only whole numbers,
then these 8 combinations do:

1, 400
2, 200
4, 100
5, 80
8, 50
10, 40
16, 25
20, 20

7 0

4 years ago

Which element listed would have the greatest electronegativity?

DiKsa [7]

Answer:

A. Fluorine

Explanation:

This is because it has the smallest atomic radius.

${ \tt{}}$

7 0

3 years ago

Read 2 more answers

A spherical wave with a wavelength of 2.0 mm is emitted from the origin. At one instant of time, the phase at rrr = 4.0 mm is πr

max2010maxim [7]

Complete Question

A spherical wave with a wavelength of 2.0 mm is emitted from the origin. At one instant of time, the phase at r_1 = 4.0 mm is π rad. At that instant, what is the phase at r_2 = 3.5 mm ? Express your answer to two significant figures and include the appropriate units.

Answer:

The phase at the second point is $\phi _2 = 1.57 \ rad$