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2 years ago

Question 17 of 25

Physics

1 answer:

crimeas [40]2 years ago

4 0

Answer:

Explanation:

heat is an energy that transfers from a hot body to cold body

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A 0.25-kg ball sits on the roof of a building that is 10 meters tall. Find the GPE. (Gravity = 9.8 on Earth)

Tasya [4]

Gravitational potential energy = mgh or mass times acceleration due to gravity times the height

Here the mass is 0.25kg, the height is 10m, and gravity is 9.8m/s^2 so...

GPE = (0.25)(10)(9.8)

GPE = 24.5 J

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3 years ago

Acid rain contributes to soil erosion. Acid rain can be caused by

elixir [45]

It can be caused by chemical reactions like sulfur dioxide and nitrogen oxides. These can rise very high in the atmosphere. They can mix in with oxygen and rain and thats where you get your acid rain from

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3 years ago

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Please help!!!!!!!! 25 points

Archy [21]

Answer:

B: beaks, finches.

Explanation:

Beaks, finches. This is because he noticed that fruit-eating finches had beaks similar to parrots, while finches that ate insects had narrow beaks. The difference in their beaks is due to adapting to different environments which causes them to evolve into different species of finches.

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2 years ago

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What is an object's acceleration that takes 550.0 meters to go from 6.0 m/s to<br> 85.0 m/s?

Dvinal [7]

from,

v² = u² + 2as

where s = distance

a = (v² - u²) /2s

a = (85² - 6²) /2*550

a = 6.53m/s²

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2 years ago

A water balloon launcher uses an elastic band with a spring constant of 115 N/m. To use the launcher, you stretch the band back

Lorico [155]

Here elastic balloon launcher will behave like an ideal spring

so here we have

spring constant k = 115 N/m

mass of balloon = 1.3 kg

Part a)

Stretch in the band is given as

x = 0.8 m

now the force on the balloon is given by

F = k x

now from above

$F = (115) (0.8) = 92 N$

so it will exert 92 N force on it

Part b)

Elastic potential energy is given as

$U = \frac{1}{2}kx^2$

so here we have

$U = \frac{1}{2}(115)(0.8)^2$

$U = 36.8 J$

Part c)

Here in this case we can say that kinetic energy gained by the balloon must be same as the elastic potential energy stored in the rubber because there is no energy loss in this system

So kinetic energy = 36.8 J

Part d)

As we know by the formula of kinetic energy

$K = \frac{1}{2}mv^2$

$36.8 = \frac{1}{2}(1.3)v^2$

$v = 7.52 m/s$

so speed of the balloon will be 7.52 m/s

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2 years ago

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