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vovangra [49]
3 years ago
12

Which statement describes a difference between electromagnetic and mechanical waves? A. Mechanical waves do not transfer energy,

but electromagnetic waves do. B. Mechanical waves cannot be longitudinal, but electromagnetic waves can. C. Electromagnetic waves cannot move particles, but mechanical waves can. D. Electromagnetic waves do not require a medium, but mechanical waves do
Physics
1 answer:
Natasha_Volkova [10]3 years ago
8 0
The answer is D.

Mechanical waves need a medium to travel, for example, sound is a mechanical wave. You are able to hear other people because the sound wave is travelling trough a fluid -air-. If you were to be in space -vacuum- you would not be able to hear anything. 

The most well known example of an electromagnetic wave is light. As you may have noticed, we're able to get the light from the Sun to Earth; clearly light -electromagnetic wave- is able to travel in vacuum/space (i.e., without a medium).
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How much work would have to be done to bring a 1150kg automobile traveling at 86km/h to a stop?​
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Explanation:

We have,

Mass of an automobile is 1150 kg

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Concept used : Work energy theorem

Th change in kinetic energy of an object is equal to the work done by it. The work done is then given by :

W=\dfrac{1}{2}m(v^2-u^2)

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Therefore, the work done by the automobile is -3.27\times 10^5\ J.

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3 years ago
An object 1 of mass m1 is separated by some distance d from an object 2 of mass 2m1 . An object 3 of mass m3 is to be placed bet
Harrizon [31]

If the potential energy of the three-object system is to be a maximum (closest to zero), should object 3 be placed closer to object 1, closer to object 2, or halfway between them?

If the potential energy of the three-object system is to be a maximum (closest to zero), should object 3 be placed closer to object 1, closer to object 2, or halfway between them?

 

Object 3 should be placed closer to object 1.

 

Object 3 should be placed on a halfway between object 2 and object 1.

 

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