Physics, 26.07.2019 03:30 khuak877

Calculate the change internal energy (î´e) for a system that is giving off 45.0 kj of heat and is performing 855 j of work on the surroundings.

Answers: 1

Show answers

Answers

Answer from: skwmks8924

Change in internal energy is -45855 J.

Given :

Heat, Q = -45 kJ

(Q is negative because heat is released by the system)

Work, W = -855 J

(W is negative because work is done by the system)

Solution :

We know that the change in internal energy is given by,

$\rm \bigtriangleup U = Q+W$

$\rm \bigtriangleup U = -45000-855$

$\rm \bigtriangleup U = -45855\;J$

Therefore change in internal energy is -45855 J.

For more information, refer the link given below,

link

Answer from: mariafsoriano928

The change in internal energy of a system is given by (second law of thermodynamics)
$\Delta U = Q + W$
where Q is the heat absorbed by the system and W is the work done on the system.

In order to correctly evaluate the internal energy change, we must be careful with the signs of Q and W:
Q positive -> Q absorbed by the system
Q negative -> Q released by the system
W positive -> W done on the system by the surroundings
W negative -> W done by the system on the surroundings

In our problem, the heat released by the system is Q=-45 kJ=-45000 J

(with negative sign since it is released by the system), and the work done is W=-855 J

still with negative sign because it is performed by the system on the surrounding, so the change in internal energy is
$\Delta U = Q +W=-45000 J - 855 J=-45855 J$

Answer from: Quest

Answer: it will take 4.36 seconds to reach her average velocity 10.69 miles/hour.explanation: we have equation of motion $s=ut+\frac{1}{2} at^2$ ,where s is the displacement, a is the acceleration, u is the initial velocity and t is the time taken.average velocity = displacement/ time taken.average velocity = 10.69 miles/hr = 10.69*1.6*1000/(60*60) = 4.75 m/s4.75 = s/ts = 4. 1we also have acceleration = 2.18 m/s², initial velocity = 0 m/s $s=0*t+\frac{1}{2} *2.18*t^2$ $s=1.09t^2[/ 2equating equation 1 and 2 [tex]4.75t = 1.09t^2\\ \\ t=4.36 seconds.$ so it will take 4.36 seconds to reach her average velocity 10.69 miles/hour.

Answer from: Quest

Global warming was a major concern some people do not care global warming is fake it is not real the percentage of it happening is slight

Other questions on the subject: Physics

Physics, 22.06.2019 16:00, dmgcity

State the following: boyle's law and charle's law

Answers: 2

continue

Physics, 23.06.2019 03:40, hernsl0263

Anumber of conditions are required for a population to be in hardy-weinberg equilibrium. which of the following are correct descriptions of the conditions that must be met? check all that apply. a. no mutations b. random mating c. small population d. migration or gene flow e. occurrence of mutations f. no natural selection

Answers: 1

continue

Physics, 23.06.2019 15:50, jenesis8

Which statement best describes what energy transfer diagrams show? energy can change form, but the total amount of energy stays the same. every energy transformation results in a reduction of energy energy transformations result in fewer types of energy each type of energy can change into one other type of energy

Answers: 1

continue

Physics, 23.06.2019 19:30, salsa456

In volleyball players can or cannot touch the net while the ball is in play

Answers: 1

continue

You know the right answer?

Calculate the change internal energy (î´e) for a system that is giving off 45.0 kj of heat and is pe...