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vovangra [49]
2 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]2 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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3 0
3 years ago
A rigid tank internal energy of fluid 800kJ. Fluid loses 500kJ of heat and padle wheel does 100kJ of work. Find final internal e
Nesterboy [21]

Answer:

 U₂ = 400 KJ      

Explanation:

Given that

Initial energy of the tank ,U₁= 800 KJ

Heat loses by fluid ,Q= - 500 KJ

Work done on the fluid ,W= - 100 KJ

Sign -

1.Heat rejected by system - negative

2.Heat gain by system - Positive

3.Work done by system = Positive

4.Work done on the system-Negative

Lets take final internal energy =U₂

We know that

Q= U₂ - U₁ + W

-500 = U₂ - 800 - 100

U₂ = -500 +900 KJ

U₂ = 400 KJ

Therefore the final internal energy = 400 KJ

6 0
2 years ago
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