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faust18 [17]
3 years ago
8

Which of the following has potential but not kinetic energy?

Physics
1 answer:
gavmur [86]3 years ago
7 0

The answer would be option D "a ball sitting on a shelf." Potential energy is the amount of energy a object has while it's at rest.. (or not moving) Kinetic energy is how much energy a object is while it's moving. So in this case it's option D because a ball sitting on a shelf isn't moving therefore it has potential energy. It's not option A because thats a example of kinetic energy since how the roller coaster is moving. It's not option B because it's kinetic energy because the bike is moving. It's also not option C because it's kinetic energy because the bird is moving.


Hope this helps!

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Two identical loudspeakers 2.00 m apart are emitting sound waves into a room where the speed of sound is 340 m/s. Abby is standi
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Answer:

The lowest possible frequency of sound for which this is possible is 1307.69 Hz

Explanation:

From the question, Abby is standing 5.00m in front of one of the speakers, perpendicular to the line joining the speakers.

First, we will determine his distance from the second speaker using the Pythagorean theorem

l₂ = √(2.00²+5.00²)

l₂ = √4+25

l₂ = √29

l₂ = 5.39 m

Hence, the path difference is

ΔL = l₂ - l₁

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ΔL = 0.39 m

From the formula for destructive interference

ΔL = (n+1/2)λ

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Then,

0.39 = (1+ 1/2)λ

0.39 = (3/2)λ

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∴ λ = 0.39/1.5

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Hence, the lowest possible frequency of sound for which this is possible is 1307.69 Hz.

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