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3 years ago

The internal energy of a system....

Physics

1 answer:

Angelina_Jolie [31]3 years ago

5 0

Answer:

C. Equals the sum of all forms of energy contained within the system.

D. Equals the heat entering the system at constant volume.

E. Equals the heat entering the system plus the work done on the system

Explanation:

Internal energy is defined as the sum of internal kinetic energy and internal potential energy, that is, the energy contained within the system.

The first law of thermodynamics relates the change in the internal energy with the heat entering the system (Q) and work done on the system (W), with the following expression:

$\Delta U=Q+W$

If the system is at constant volume the work done is zero. Therefore, the heat entering the system increases its internal energy:

$\Delta U=Q$

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How do speed and velocity differ

Elanso [62]

Answer: Speed is a scalar

LVelocity is a vector quantity

Explanation: Scalar quantity such as speed only have magnitude in them. It only indicates the strength on how an object is moving. For velocity it is a vector quantity it both have magnitude and involves direction where the object is moving.

4 0

3 years ago

A horse pulls a cart along a flat road. Consider the following four forces that arise in this situation. (1) the force of the ho

Paraphin [41]

Answer:

(1) - (2)

and

(3) - (4)

Explanation:

Hi!

The Newton's third law states that for every action there's and equal and opposite reaction.

Lets us consider the first force:

(1) the force of the horse pulling on the cart

Therefore, its counterpart, will be a force of the cart pulling on the horse, which is actually:

(2) the force of the cart pulling on the horse

Analogously, the third force:

(3) the force of the horse pushing on the road

and the fourth force:

(4) the force of the road pushing on the horse

From a action reaction pair, since the former force acts on the road by the horse, and the latter on the horse by the road

8 0

3 years ago

A cable with mass 0.5 kilograms per meter (kg/m) is used to lift 150 kg of coal up a mine shaft 50 meters deep. Set up the integ

zalisa [80]

Answer:

$W=-\int_{0}^{50}[150-0.5y]dy$

Explanation:

the integral for the work is:

$W=\int\vec{F}\cdot d\vec{l}=\int(-M(y)g)dy$

the work is against the gravitational force. While the coal is going up, M(y) is changing due to the length of the cable is lower. We can describe this by using the following formula

$M(y)=150kg-0.5\frac{kg}{m}y$

Thus , the integral for the work is:

$W=-\int_{0}^{50}[150-0.5y]dy$

hope this helps!!

6 0

3 years ago

These 2 processes cause watersheds to change.

Alex777 [14]

Tsunami and water bender those are 2 like avatars

5 0

3 years ago

Read 2 more answers

3. Some guitarists like the feel of a set of strings that all have the same tension. For such a guitar, the G string (196 Hz) ha

Vlad [161]

Answer:

0.98 g/m

Explanation:

Note: Since Tension and frequency are constant,

Applying,

F₁²M₁ = F₂²M₂............... Equation 1

Where F₁ = Frequency of the G string, F₂ = Frequency of the A string, M₁ = mass density of the G string, M₂ = mass density of the A string.

make M₂ the subject of the equation

M₂ = F₁²M₁/F₂²............... Equation 2

From the question,

Given: F₁ = 196 Hz, M₁ = 0.31 g/m, F₂ = 110 Hz

Substitute these values into equation 2

M₂ = 196²(0.31)/110²

M₂ = 0.98 g/m

4 0

3 years ago