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3 years ago

Do EM Waves need matter in order for them to go from one place to another?

Physics

2 answers:

Ymorist [56]3 years ago

8 0

Answer:

Sound wave is a mechanical wave . Some material quantity is needed in order for a sound wave to propagate by compression and rare faction of the medium entity involved. An electromagnetic wave requires no medium as electric fields and magnetic fields constantly generate each other as the wave propagates. This comes through the maxwell equations that a changing magnetic field produces an electric field and vice versa.

olga_2 [115]3 years ago

8 0

Answer:

sorry im stupid idk

Explanation:

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Select the correct answer.

Liono4ka [1.6K]

Answer: The electromagnetic waves reach Earth, while the mechanical waves do not.

Explanation:

7 0

3 years ago

Read 2 more answers

Ft-Fg= ma solve for a

densk [106]

The answer is a= Ft-Fg/m

8 0

4 years ago

Read 2 more answers

Car's mass is 950kg. It's driven at 100km/h. How big is the kinetic energy?

polet [3.4K]

Answer:

4750000 J

Explanation:

Kinetic Energy= 1/2* mass* velocity²

1/2*950*100²=4750000

8 0

3 years ago

At this radius, what is the magnitude of the net force that maintains circular motion exerted on the pilot by the seat belts, th

Ainat [17]

Answer:

Fc=5253 N

Explanation:

Answer:

Fc=5253 N

Explanation:

sequel to the question given, this question would have taken precedence:

"The 86.0 kg pilot does not want the centripetal acceleration to exceed 6.23 times free-fall acceleration. a) Find the minimum radius of the plane’s path. Answer in units of m."

so we derive centripetal acceleration first

ac (centripetal acceleration) = v^2/r

make r the subject of the equation

r= v^2/ac

ac is 6.23*g which is 9.81

v is 101m/s

substituing the parameters into the equation, to get the radius

(101^2)/(6.23*9.81) = 167m

Now for part

( b) there are two forces namely, the centripetal and the weight of the pilot, but the seat is exerting the same force back due to newtons third law.

he net force that maintains circular motion exerted on the pilot by the seat belts, the friction against the seat, and so forth is the centripetal force.

Fc (Centripetal Force) = m*v^2/r

So (86kg* 101^2)/(167) =

Fc=5253 N

4 0

4 years ago

Two friends, Joe and Sam, go to the gym together to strength train. They decide to start off with an exercise called flat bench

astra-53 [7]

Answer:

216.31 (the work done by gravity is -216.31) positive for going up.

Explanation:

We look at this question first by getting the right equation for <em>work</em>.

Which should be... W = F x D.

From this, we can do everything, we need the Force (F) first - the question tells us that Joe is lying on his back and moves his arms upward to raise the barbell. This means that he is countering the force of graving on the object.

What is the formula for the force of gravity on an object near the earth?

Right here --- $F_{grav}$ = mg

m = the mass and...

g = the acceleration due to gravity which is <em>9.81 m/s2</em>

Before we plug things in though, we need to convert everything to SI units,

the weight is in kg - so we're good to go there, but the length of Joe's arms are in "cm" we need m or meters. Converting 70 cm to m = .7 m.

Now, we just put it all together - (31.5kg)(9.81m/s2)(.7m) = 216.31 J or 216.31 N m.

3 0

3 years ago