1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Elena-2011 [213]
2 years ago
9

A rigid tank contains 1 kg of air (ideal gas) at 15 °C and 210 kPa. A paddle wheel supplies work input to the air such that fina

l temperature is 97 "C. The specific heats are Cp 1.005 kJ(kg.K) and C-0.718 kJ/(kg.K). Determine the total work done in kJ:
Physics
1 answer:
lisov135 [29]2 years ago
5 0

Answer:

-58.876 kJ

Explanation:

m = mass of air = 1 kg

T₁ = Initial temperature = 15°C

T₂ = Final temperature = 97°C

Cp = Specific heat at constant pressure = 1.005 kJ/kgk

Cv = Specific heat at constant volume = 0.718 kJ/kgk

W = Work done

Q = Heat = 0 (since it is not mentioned we are considering adiabatic condition)

ΔU = Change in internal energy

Q = W+ΔU

⇒Q = W+mCvΔT

⇒0 = W+mCvΔT

⇒W = -mCvΔT

⇒Q = -1×0.718×(97-15)

⇒Q = -58.716 kJ

You might be interested in
a hawk flies in a horizontal arc of radius 10.3 m at a constant speed of 4.8 m/s. find its centripetal acceleration. answer in u
n200080 [17]

The hawk’s centripetal acceleration is 2.23 m/s²

The magnitude of the acceleration under new conditions is 2.316 m/s²

radius of the horizontal arc = 10.3 m

the initial constant speed = 4.8 m/s

we know that the centripetal acceleration is given by

    a_{c}  = \frac{v^{2} }{r}

   a_{c}  = 23.04/10.3

    a_{c}  = 2.23 m/s²

It continues to fly but now with some tangential acceleration

a_{t} = 0.63 m/s²

therefore the net value of acceleration is given by the resultant of the centripetal acceleration and the tangential acceleration

so

a_{net}  =  \sqrt{a_{c} ^{2} +a_{t} ^{2}   }

a_{net}  =  \sqrt{4.97 + 0.396}

a_{net}  =  2.316 m/s²

So the magnitude of  net acceleration will become 2.316 m/s².

learn more about acceleration here :

brainly.com/question/11560829

#SPJ4

8 0
1 year ago
A thin layer of liquid methylene iodide (n = 1.756) is sandwiched between two flat, parallel plates of glass (n = 1.50). What mu
Harrizon [31]

Answer:

t = 96.1 nm

Explanation:

For strong reflection through liquid layer we know that the path difference between two reflected light rays must be integral multiple of wavelength

now we know that the path difference of two reflected light from thin liquid layer is given as

2\mu t - \frac{\lambda}{2} = N\lambda

here we know that

\mu = 1.756

t = thickness of layer

N = 0 (for minimum thickness of layer)

\lambda = 675 nm

now we have

2(1.756) t = \frac{675 nm}{2}

t = 96.1 nm

5 0
3 years ago
NEED HELP!!! ANSWER THESE 5 QUESTIONS FOR 25 POINTS!!!! PLEASE ANSWER!! I WILL GIVE YOU BRAINLIEST
ladessa [460]
1.A
2. C
3. Not Sure
4. Not Sure
5. Biometrics can help to identify
who's at risk for injuries and when
they're able to safely return, and
they can gauge athlete readiness to
determine when they'll be
performing at an optimal level.
4 0
2 years ago
Read 2 more answers
If you had only one match, and entered a dark room containing an oil lamp, some newspaper, and some kindling wood, which would y
alukav5142 [94]
The match
you need to light the match before you can light anything else.

and after the match is lit, maybe light the oil lamp first

7 0
2 years ago
Read 2 more answers
La siguiente gráfica representa la velocidad como función del tiempo para dos carros que parten simultáneamente desde el mismo p
xenn [34]
Шада и я тебя понимаю с чего начать с того ни другого человека дал в долг у меня в здоровье
6 0
2 years ago
Other questions:
  • If an equation is dimensionally correct, does this mean that the equation must be true? If an equation is not dimensionally corr
    11·1 answer
  • Before the fission process takes place, lead-207 is bombarded with neutrons, it can change into
    7·2 answers
  • You watch distant Sally Homemaker driving nails into a front porch at a regular rate of 1 stroke per second. You hear the sound
    13·1 answer
  • Four pairs of objects have the masses as described below, along with the distances between
    7·1 answer
  • b. A force 100N makes an angle of Ø with the x axis and has a y component of 30 N. Find both the x and y component of the force
    9·1 answer
  • A car is accelerating to the right. In which direction is the applied force?
    6·1 answer
  • You are cycling around a circular track at a constant speed. Does the magnitude of your acceleration change? The direction?
    11·1 answer
  • In Fraunhofer diffraction wave front used is __________. A. Spherical B. Circular C. Plane D. Conical
    11·1 answer
  • What is the mass of a substance with a density of 9g/cm3 and a volume of 4cm3
    11·1 answer
  • Find the kenetic energy of a car of mass 700kg racing with a velocity of 10m/s
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!