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sattari [20]
1 year ago
13

7. A particle is forced to move in a straight line path. It returns to the starting point after 10 s. The total distance covered

by the particle is 20 m. Which of the following statements is true regarding the motion of the particle? a The average velocity of the particle is zero b The displacement of the particle is zero c The average speed of the particle is 2 m/s d All of the above​
Physics
1 answer:
lutik1710 [3]1 year ago
8 0

d. All three statements are true.

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REMARKS The speed found in part (a) is the same as if the woman fell vertically through a distance of 21.9 m. The result of part
sasho [114]

Answer:

Yes, if the system has friction, the final result is affected by the loss of energy.

Explanation:

The result that you are showing is the conservation of mechanical energy between two points in the upper one, the energy is only potential and the lower one is only kinetic.

In the case of some type of friction, the change in energy between the same points is equal to the work of the friction forces

    W_{fr} = ΔEm

    W_{fr} = Em_{f} -Em₀

As we can see now there is another quantity and for which the final energy is lower and therefore the final speed would be less than what you found in the case without friction.

    Em_{f} =W_{fr} + Em₀

 

Remember that the work of the rubbing force is negative, let's write the work of the rubbing force explicitly, to make it clearer

    ½ m v² = -fr d + mgh

    v = √(-fr d 2/m + 2 gh)

    v = √ (2gh - 2fr d/m)

Now it is clear that there is a decrease in the final body speed.

Consequently, if the system has friction, the final result is affected by the loss of energy.

5 0
3 years ago
Use double replacement and combustion reaction in a sentence
maksim [4K]

Answer:

In a single replacement reaction, one element takes the place of another in a single compound. In a double replacement reaction, two compounds exchange elements. A combustion reaction occurs when a substance reacts quickly with oxygen. Combustion is commonly called burning

3 0
3 years ago
What the kinetic Energy of 80kg<br> object this is Moving with a Speed<br> of 23 m/s
Katyanochek1 [597]

Explanation:

Kinetic Energy Formula = ½mv²

  • ½×800kg×(23m/s)²
  • 400kg×529m²/s²
  • 211600 kg•m²/s²
  • 211700 joule Answer

4 0
2 years ago
In the Niagara Falls hydroelectric generating plant, the energy of falling water is converted into electricity. The height of th
Tamiku [17]

Answer:

2.124 kg of water

Explanation:

height of the falls is about 48 meters.

Mass of water needed is 1kg = 1000g

Power needed is 106 watts.

The amount of energy in 106 watts in one sec is 106 joules.

To calculate the energy of the 1kg falling water = Mgh

Energy = 1000*9.81*48

Energy = 470880 joules.

1 megawatt is = 1000000watts

The kilogram of water needed is 1000000/470880 = 2.124 kg of water

3 0
3 years ago
If a basketball travels a distance of 4 meters in 5 seconds, what is its average speed?
aliya0001 [1]

Average speed = (distance covered) / (time to cover the distance)


Average speed = (4 meters) / (5 seconds)


Average speed = (4/5) (meters/seconds)


Average speed = 0.8 m/s

5 0
3 years ago
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