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3 years ago

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Why is it important to study electromagnetic waves?

1 answer:

labwork [276]3 years ago

3 0

The study of EM is essential to understanding the properties of light, its propagation through tissue, scattering and absorption effects, and changes in the state of polarization. ... Since light travels much faster than sound, detection of the reflected EM radiation is performed with interferometry.

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An object that has the ability to do work has __________ energy.

harkovskaia [24]

I believe the correct answer is kinetic energy.

We know that kinetic energy is the movement of any object, no matter its size.

Mechanical energy is a type of kinetic energy, which involves the movement of larger objects.

I hope I helped!

If you need a more thorough explanation, don't hesitate to message me or leave a comment down below.

Here's a video that explains energy:

https://www.khanacademy.org/science/physics/work-and-energy/work-and-energy-tutorial/v/work-and-energy-part-2?modal=1

5 0

3 years ago

Read 2 more answers

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

Each vertical line on the graph is 1 millisecond (0.001 s) of time. What is the period and

Mekhanik [1.2K]

Explanation:

Given that,

Each vertical line on the graph is 1 millisecond (0.001 s) of time.

We need to find the period and the frequency of the sound wave. The period of a wave is equal to the each vertical line on graph i.e. 0.001 s.

Let f be the frequency of the sound wave. So,

f = 1/T

i.e.

$f=\dfrac{1}{0.001 }\\\\f=1000\ Hz$

So, the period and the frequency of the sound waves is 1 milliseond and 1000 Hz respectively.

6 0

2 years ago

The name of a sedimentary rock is usually based on:

tigry1 [53]

Answer:

C

Explanation:

The name of the rock is usually derived from the sediment grain size.

4 0

3 years ago

If a student weighs 100 pounds on Earth, how much more or less would she weigh on Pluto than Mars?

Sever21 [200]

Answer:

c because that's the answer

4 0

2 years ago