It is important because, to let them hear the sound of footsteps when a predator is around them
A)conversion I think, it is if I'm wrong, sorry
Answer:
h = 104.13 m
Explanation:
Given that,
Horizontal velocity of the car, v = 13 m/s
It hits the ground 60 m from the shoreline
We need to find the height of the cliff. Let t be the time of fall. We can find it as follows :
![t=\dfrac{d}{v}\\\\t=\dfrac{60\ m}{13\ m/s}\\\\t=4.61\ s](https://tex.z-dn.net/?f=t%3D%5Cdfrac%7Bd%7D%7Bv%7D%5C%5C%5C%5Ct%3D%5Cdfrac%7B60%5C%20m%7D%7B13%5C%20m%2Fs%7D%5C%5C%5C%5Ct%3D4.61%5C%20s)
So, the time of fall is 4.61 seconds.
Let h is the height of the cilff. Using second equation of motion to find it as follows :
![h=\dfrac{1}{2}gt^2\\\\h=\dfrac{1}{2}\times 9.8\times 4.61^2\\\\=104.13\ m](https://tex.z-dn.net/?f=h%3D%5Cdfrac%7B1%7D%7B2%7Dgt%5E2%5C%5C%5C%5Ch%3D%5Cdfrac%7B1%7D%7B2%7D%5Ctimes%209.8%5Ctimes%204.61%5E2%5C%5C%5C%5C%3D104.13%5C%20m)
So, the height of the cliff is 104.13 m.
The block is made of A) Tin, as its specific heat capacity is ![0.225 J/(g^{\circ}C)](https://tex.z-dn.net/?f=0.225%20J%2F%28g%5E%7B%5Ccirc%7DC%29)
Explanation:
When an amount of energy Q is supplied to a sample of material of mass m, the temperature of the material increases by
, according to the following equation
:
where
is the specific heat capacity of the material.
In this problem, we have:
m = 2 kg = 2000 g is the mass of the unknown material
is the amount of energy supplied to the block
is the change in temperature of the material
Solving the equation for
, we can find the specific heat capacity of the unknown sample:
![C_s = \frac{Q}{m \Delta T}=\frac{450}{(2000)(1)}=0.225 J/(g^{\circ}C)](https://tex.z-dn.net/?f=C_s%20%3D%20%5Cfrac%7BQ%7D%7Bm%20%5CDelta%20T%7D%3D%5Cfrac%7B450%7D%7B%282000%29%281%29%7D%3D0.225%20J%2F%28g%5E%7B%5Ccirc%7DC%29)
And by comparing with tabular values, we can find that this value is approximately the specific heat capacity of tin.
Learn more about specific heat capacity:
brainly.com/question/3032746
brainly.com/question/4759369
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The answer is the big bang witch goes as follows
The Big Bang model is that the universe begun in an extremely dense and hot condition and has expanded. The theory suggests, and measurements show, that the universe is still expanding today.
The Big Bang is a scientific theory about how the universe started, and then made the stars and galaxies we see today.
The universe began as a very hot, small, and dense superforce (the mix of the four fundamental forces), with no stars, atoms, form, or structure (called a "singularity"). Then about 13.8 billion years ago,[1] space expanded very quickly (thus the name "Big Bang"). This started the formation of atoms, which eventually led to the formation of stars and galaxies. It was Georges Lemaître who first noted (in 1927) that an expanding universe could be traced back in time to an originating single point. The universe is still expanding today, and getting colder as well.
As a whole, the universe is growing and the temperature is falling as time passes. Cosmology is the study of how the universe began and its development. Scientists who study cosmology agree that the Big Bang theory matches what they have observed so far. although there are flaws in this theory such as where did the explosion come from and even if u could find a way to explain the creation of the explosion itself there is the tiny fact that u cant create something from nothing however there would be starting material in this theory it wouldn't simply create more and since the theory states that the world will grow infinitely this is impossible but as i said it is a theory and the most accepted at that