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vlada-n [284]
3 years ago
8

What would be the velocitywhen a dog of 10kg and it's kinetic energy is 20J​

Physics
2 answers:
Sunny_sXe [5.5K]3 years ago
8 0
20 divided by 10 is 2 meters per second
puteri [66]3 years ago
7 0

Answer:

2 m/s

Explanation:

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The height of a cone is increasing at a rate of 10 cm/sec and its radius is decreasing so that its volume remains constant. How
ki77a [65]

Answer:

dr/dt = -2 cm/s.

Explanation:

The volume of a cone is given by:

V=\frac{1}{3} \pi r^{2}h (1)

  • r is the radius
  • h is the height

Let's take the derivative with respect to time in each side of (1).

\frac{dV}{dt}=\frac{1}{3} \pi \frac{d}{dt}(r^{2}h)=\frac{1}{3} \pi \left(2r\frac{dr}{dt}h+r^{2}\frac{dh}{dt} \right) (2)

We know that:

  • dh/dt = 10 cm / s (rate increasing of height)
  • dV/dt = 0 (constant volume means no variation with respect of time)
  • r = 4 cm
  • h = 10 cm

We can calculate how fast is the radius changing using the above information.

0=\frac{1}{3} \pi \left( 2\cdot 4\cdot \frac{dr}{dt} \cdot 10 + 4^{2}\cdot 10)\right  

Therefore dr/dt will be:

\frac{dr}{dt}=-\frac{160}{80}=-2 cm/s

The minus signs means that r is decreasing.

I hope it helps you!

6 0
3 years ago
Por favor. Escribe en Notación científica las siguientes medidas:
Zolol [24]
I don’t understand Spanish could you please translate
6 0
3 years ago
Can y’all help please
Ugo [173]

Answer:

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it is safer and cleaner

it does not produces green house gas and has 0 carbon emission

for producing electricity we use solar and wind power that does not harm the environment

advantages of using non renewable energy resource

they are abundant

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5 0
3 years ago
The density of ice can help preserve the habitats of aquatic organisms, but it can also cause the death of an organism. Which st
Paul [167]

Answer:

I think it's D. The expansion of water as it freezes increases the amount of nutrients that can dissolve in liquid water, but it could cause fluid in cells to dissolve more harmful substances.

Explanation:

I know when water freezes, it expands and between the two answers that discuss the expansion of water, D sounds the most logical to me lol.

6 0
3 years ago
Which acceleration-time graph corresponds to the motion of the car if it moves toward the right, while slowing down at a steady
Bumek [7]

We define acceleration as the rate of change of the velocity

Thus, if you have positive velocity and positive acceleration, your <u>speed increases.</u>

If you have positive velocity and negative acceleration, your speed decreases.

Now you get the idea, we will see that the correct option is graph 1.

We know that the car moves towards the right (let's define this as "the car has positive velocity") and we also know that te car is slowing down constantly (thus the acceleration needs to be negative and constant).

By looking at the graphs, the only one with these properties is graph 1.

If you want to learn more, you can read:

brainly.com/question/12550364

5 0
2 years ago
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