Question

4. In a closed system consisting of a cannon and a cannonball, the kinetic energy of a cannon is 72,000 J. If the cannonball is 18 kg it has a velocity of 23 m/s when fired from the cannon, what is the total kinetic energy in the system?

A. 72, 207 J
B. 71, 793 J
C. 67, 239 J
D. 76, 761 J



5. In a computational model of the energy loss of a house, if the energy flux increases and the total area insulated increases, what happens to the energy loss of the house?

A. The energy loss must decrease.
B. The energy loss must increase.
C. The energy loss can increase or decrease.
D. The energy loss will neither increase nor decrease.

Answer 1

Answer:

1. The velocity decreases, and the kinetic energy decreases.  

2. an increase in temperature difference between the inside and outside of the building

3. The total kinetic energy remains the same.

4. 76,761 J

5. The energy loss must increase.

Explanation:

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Answer 2

kinetic energy and thermal conductivity processes allow the correct answers to the questions are:

4. The answer for the total kinetic energy correct is:   D. 17761 J

5. the answer is:   C. The energy loss can increase or decrease.

4. Kinetic energy is due to the motion of bodies and is given by the relation  

           K = ½ m v²

Wher k is de kinetic energy, m the mass and v speed.

Let's look for the kinetic energy of the bullet

           K₂ = ½ 18 23²

           K₂ = 4761 J

They indicate the kinetic energy of the cannon is K = 72000 J, they ask the energy at total kinetic energy is

           $K_{total}$ = K + K₂

           K_{total} = 72000 + 4761

           K_{total} = 76761 J

When checking the answer, the correct one is

              D. 76761 J

5. In modern houses and systems, insulation is created to maintain heat and reduce losses

            P =$\frac{A \Delta T}{R}$  

Where P is the heat flux, A the insulated area, ΔT the temperature difference and R the relationship between the thickness of the insulation and its thermal conductivity.

In this case they indicate that the flow increases and the isolated area increases. We have several possibilities

•   The flow increases faster than the isolated area in this case the heat loss increases

•   The heat flow increases by the same amount as the isolated area, for this the amount of insulation must increase (R), the losses will remain constant.

•   The heat flow increases slower than the insulated area, the losses will decrease.

In this case it indicates that the two increases, therefore the heat requests can increase or decrease

The correct answer is :

  C. The energy loss can increase or decrease.

With kinetic energy and thermal conductivity processes we can find the correct answers to the questions that are:

4. The answer for the total kinetic energy correct is:   D. 17761 J

5. the answer is:   C. The energy loss can increase or decrease.

Learn more here: brainly.com/question/7643131