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Jet001 [13]
3 years ago
7

A heat engine receives heat of 400kW from a heat source of 1100 K, and rejects the waste heat into a heat sink at 320K. It gener

ates 120 kW of power output. Determine the 2nd law thermal efficiency of the heat engine.
Physics
1 answer:
GuDViN [60]3 years ago
4 0

Answer:

Explanation:

efficiency of carnot engine operating between 1100 K and 320 K

= 1100 - 320 / 1100

= .709

efficiency of heat engine = 120 / 400 = .30

2 nd law thermal efficiency of heat engine = .30 x 100  / .709

= 42.31 % .

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Can someone help me match the words?
Hatshy [7]

Answer:

a - 16

b - 2

c - 8

d - 13

e - 5

f - 11

g - 10

h - 17

i - 9

j - 3

k - 6

l - 12

m - 4

n - 14

o - 15

p - 1

Sorry if u get some of them wrong I did my best, for some reason number 7 has no match because there are 17 defenitions (1,2,3..etc) and 16 words (a,b,c..etc). Good Luck! Hope this helps :))

6 0
3 years ago
A bungee jumped of mass m jumps off a brodge. Assume that the bungee cord behaves like an ideal spring of srping constant k when
anzhelika [568]

Answer:

The magnitude of the acceleration is at its maximum value.

Acceleration = \frac{-Ak}{m} (m/s)^{2}

Explanation:

During simple harmonic motions such as the oscillation of a spring, at the two extremes of the motion, the acceleration of the mass becomes maximum. This is because this is the point where the force on the body  is maximum.

The angular velocity \omega=\sqrt{\frac{k}{m} }

At points of maximum extension x, the maximum acceleration is given by the formula.

a=-A\omega^{2}

substituting in the value for \omega, this implies that

a= -A\times (\sqrt{\frac{k}{m} } )^{2}

⇒a=\frac{-Ak}{m} (m/s)^{2}

4 0
3 years ago
(a) When the terminals of a 100-V battery are connected to two parallel plates 1 cm apart, what is the electrical field in the r
DaniilM [7]

Answer:

The electrical field in the region between the plates is 10,000 V/m.

Explanation:

Given;

potential difference between the two parallel plates, V = 100 V

distance between the two parallel plates, d = 1 cm = 0.01 m

The electrical field in the region between the plates is given as;

E = V / d

where;

E is the electrical field in the region between the plates

E = (100) / (0.01)

E = 10,000 V/m

Therefore, the electrical field in the region between the plates is 10,000 V/m.

3 0
3 years ago
During which segments is kinetic energy decreasing?<br> A)1,2,3<br> B) 4,5<br> C)1,3,5<br> D)2,4
Nutka1998 [239]

Answer:

c

Explanation:

kinetic energy is energy an object has due to its movement. for instance, if someone was riding down a hill, when the motion of the bike begins to decrease so does the kinetic energy

3 0
3 years ago
Read 2 more answers
_?_ and electricity are NOT SOURCES of electricity.
Nastasia [14]
Okay, passive solar is used to gain heat energy, not electricity, so that is one. All the others can be used to produce electricity, so I'm not sure what the second answer is.
4 0
3 years ago
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