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madam [21]
3 years ago
14

what are some examples of how we interfere with ecosystems. For each example, explain how it happens, why we do it, and then men

tion short and long term effects of it
Physics
2 answers:
mina [271]3 years ago
4 0
We cut down trees in the ecosystem for wood or to make buildings. This kills animals because they no longer have their habitat. Short term effects would be less trees because we can always plant more and a long term is extinction of animals because of habitat loss. Another example is pollution.We drive cars and buses that produce a lot of pollution. We do this to get from point a to point b, a short term affect would be  pollution in the air, a long term is ruining the earths o-zone which let in radiation.

Mamont248 [21]3 years ago
4 0

Answer:

Explanation:

if  you are using USA test prep the answer is d.

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While moving in, a new homeowner is pushing a box across the floor at a constant velocity. The coefficient of kinetic friction b
Citrus2011 [14]

Answer:

\theta = 66.7 degree

Explanation:

since force is applied downwards at some angle with the horizontal

so here we will have

F_n = mg + Fsin\theta

now we know that the box will not move if applied force is balanced by frictional force on it

so we will have

Fcos\theta = \mu F_n

F cos\theta = \mu (mg + F sin\theta)

F(cos\theta - \mu sin\theta) = \mu mg

F = \frac{\mu mg}{cos\theta - \mu sin\theta}

so here we can say

cos\theta - \mu sin\theta > 0

tan\theta = \frac{1}{\mu}

\theta = tan^{-1}\frac{1}{\mu}

\theta = tan^{-1}(\frac{1}{0.43})

\theta = 66.7 degree

6 0
3 years ago
A train travels 65 kilometers in 5 hours, and then 61 kilometers in 4 hours. What is its average speed? _______km/hr
olasank [31]
The trains average speed is 13 km/hr.
4 0
3 years ago
Read 2 more answers
2. An object with moment of inertia ????1 = 9.7 x 10−4 kg ∙ m2 rotates at a speed of 3.0 rev/s. A 20 g mass with moment of inert
svetoff [14.1K]

Answer:

2.85 rad/s

Explanation:

5 cm = 0.05 m

20 g = 0.02 kg

When dropping the 2nd object at a distance of 0.05 m from the center of mass, its corrected moments of inertia is:

I_2 = 1.32\times10^{−6} + 0.02 * 0.05^2 = 0.513\times10^{-4} kgm^2

So the total moment of inertia of the system of 2 objects after the drop is:

I = I_1 + I_2 = 9.7\times10^{-4} + 0.513\times10^{-4} = 0.0010213 kgm^2

From here we can apply the law of angular momentum conservation to calculate the post angular speed

\omega_1 I_1 = \omega_2 I

\omega_2 = \omega_1 \frac{I_1}{I} = 3 \frac{9.7\times10^{-4}}{0.0010213} = 2.85 rad/s

6 0
3 years ago
Why is a rotting apple a reaction in which energy is neither absorbed nor released?
o-na [289]

Answer:

Hey

It would have to be C because no net energy is lost.

7 0
2 years ago
_____________ circular motion occurs when an object is traveling with constant speed in a circle.
emmasim [6.3K]
Your answer is ''Uniform''.

Hope this helps :)
7 0
2 years ago
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