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2 years ago

A hiker at the entrance to a cave yells to produce an echo. If the time between when the

Physics

1 answer:

kolbaska11 [484]2 years ago

3 0

Oh okie oh gosh lol lol I just don’t

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For this exercise, use the position function s(t) = −4.9t2 + 250, which gives the height (in meters) of an object that has falle

nignag [31]

Answer:

t=7.14s

v=-69.972 m/s

Explanation:

Position function

$s(t)=-4.9*t^{2}+250$

Velocity is the derivative of position function

$V(t)=\frac{dx}{dt}\\V(t)=-2*4.9*t\\V(t)=-9.8*t$

The time the object hit the ground can be find by the given function know that the position is going to be 0m

$s(t)=-4.9*t^{2}+250$

$s(t)=0\\0=-4.9*t^{2} +250\\t=\sqrt{\frac{250}{4.9}}\\t=7.14s$

Check:

$s(7.14)=-4.9*(7.14s)^{2}+250\\ s(7.14)=-250+250\\s(7.14)=0m$

So the velocity can be find using the time discovery before and using the same function but with the derivate

$V(t)=-2*4.9*t\\V(7.14)=-2*4.9*(7.14)\\V(7.14)=-69.972 \frac{m}{s}$

The velocity is negative because the object is moving downward

6 0

3 years ago

Compared to the amount of radiation received from the Sun, about how much radiation does the surface of the earth receive from t

babymother [125]

Answer:

https://earthobservatory.nasa.gov/features/EnergyBalance#:~:text=The%20atmosphere%20absorbs%2023%20percent,surface%20radiates%20only%2012%20percent.

Explanation:

5 0

2 years ago

What is the strength of the electric field ep 0.90 mm from a proton?

dem82 [27]

The electric field strength is inversely related to the square of the distance.so the strength of the electric field is given by

$E=\frac{1}{4\pi \epsilon _{0} } \frac{q}{r^{2} } = \frac{k q}{r^{2} }$

Here, $\frac{1}{4\pi \epsilon _{0} } = k$ is constant depend upon medium and its value is $9.0 \times10^{9} \ N m^2/C^2$ and q is charge and r is the distance.

Given $r = 0.90 mm = 9.0 \times 10^{-4} m$ and we know the charge of proton, $q = 1.6\times 10^{-19} \ C$ .

Therefore,

$E=\frac{9.0 \times10^{9} \ N m^2/C^2 \times1.6\times 10^{-19} \ C }{(9.0 \times 10^{-4} m)^2} = 0.177 \times 10^{-2} \ N/C \\\\ E= 1.77 \times 10^{-3} N/C$

4 0

3 years ago

If a material contains three elements but not joined in a fixed proportion it is a

iren [92.7K]

My answer -

<span> a molecule The clues are that it is elements, so that means atoms, and that it is in a fixed proportion like a molecular formula.

Happy to help you have a great day
</span>

4 0

3 years ago

What was one main point of Dalton's atomic theory

goblinko [34]

All matter is composed of atoms, indestructible building blocks.

4 0

3 years ago

Read 2 more answers