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murzikaleks [220]
4 years ago
7

A Carnot engine operating between a reservoir of liquid mercury at its melting point (233 K) and a colder reservoir extracts 10.

0 J of heat from the mercury and does 8.0 J of work during each cycle. What is the temperature of the colder reservoir
Physics
1 answer:
Alex73 [517]4 years ago
6 0

Answer:

T'=46.6 K              

Explanation:

Let T be the temperature of a hot reservoir, T' be the temperature of cold reservoir.

For a Carnot's engine, efficiency can be calculated as follows:

\eta=\frac{W}{Q}=1-\frac{T'}{T}

Where, W is the amount of work done, Q is the amount of heat extracted from the hot reservoir.

Substitute the values: W= 8.0 J

Q = 10.0 J

T = 233 K

\frac{8}{10}=1-\frac{T'}{233K}\\\Rightarrow 0.8 = 1-\frac{T'}{233K}\\\\\Rightarrow T' = 0.2 \times 233 K\\\Rightarrow T'=46.6 K

Thus, the temperature of the cold reservoir is 46.6 K.

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If the temperature at the surface of Earth (at sea level) is 100°F, what is the temperature at 2000 feet if the average lapse ra
oksano4ka [1.4K]

Answer:

107 °F

Explanation:

Given that

The temperature at sea level = 100°F

height ,h= 2000 feet

The average lapse rate = 3.5°F/1000 feet

Given that rise in temperature 3.5°F per 1000 feet.

1000 feet ⇒ 3.5°F

Given that 2000 feet

2000 feet ⇒ 3.5°F x 2 +100°F

2000 feet ⇒ 107 °F

Therefore the temperature will be 107 °F  .

6 0
3 years ago
You are the captain of a pirate ship and wish to find out how strong a new first mate is at rowing treasure from shore to the sh
AlekseyPX

Answer:

C

Explanation:

Power is work divided by time:

P = W / t

Work is force times distance:

W = F d

Therefore:

P = F d / t

Given that F = 500 N, d = 60 m, and t = 240 s:

P = 500 N * 60 m / 240 s

P = 125 W

Answer is C.

7 0
3 years ago
Two people are pushing a couch from the same side. One person pushes with a force of 2 N. The other person pushes with a force o
SashulF [63]

Answer:

the answer is letter d because both of them are pushing the couch in the same direction so 4 plus 2 will give you 6N

8 0
3 years ago
While seeds are forming, another plant part forms around them. Animals eat this part and carry the seeds to a new spot.
Eddi Din [679]

Answer:

<em>The correct option is D) fruit</em>

Explanation:

Both the gymnosperm and the angiosperms plants produce seed. Seeds are an essential part of reproduction in plants.

After fertilization has occurred, the ripened ovule is the part which turns into a seed. The size of the seeds depends on the type if plant.

After fertilization, the ovary forms the fruit. As the ovule is present in the ovule hence after fertilization, the seed which was made from the ovule gets enclosed in the fruit which was made from the ovary.

6 0
3 years ago
A digital stopwatch reading 0:13 37. Read the elapsed time on the stopwatch and answer the questions. In which digit is there th
Xelga [282]

The digit with the least amount of confidence can be seen in the second part which is 7.

The number of significant figures in the measurement of the stopwatch is 4.

An elapsed time is the difference between the time prior to the commencement of an event and the time at which the event has ended.

From the stopwatch, the elapsed time is given as:

0hour : 13 minutes : 37 seconds

The digit with the least amount of confidence can be seen in the seconds part is 7.

A significant figure is a real figure that is dependable and absolutely essential to convey the quantity of something.

The number of significant figures in the measurement of the stopwatch is 4.

Learn more about elapsed time here:

brainly.com/question/10403745

5 0
2 years ago
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