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ruslelena [56]
3 years ago
9

When is the object at rest? in constant speed? accelerating?​

Physics
1 answer:
12345 [234]3 years ago
6 0

Answer:

Answered in explanaion.

Explanation:

<u>REST</u>: When an object does not change its position with respect to its frame of reference or surrounding, then the object is said to be in the state of rest.

<u>CONSTANT SPEED</u>: When the object covers equal distance in equal intervals of time, the object is said to be moving with constant speed.

<u>ACCELERATING</u>: An object is said to be accelerating when the speed of the object increases with respect to time.

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You wish to watch TV at exactly 85 dB and no louder to avoid long term damage to your hearing. You record the sound intensity le
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1) the new power coming from the amplifier is 19.02 W

2) The distance away from the amplifier now is 5.50 m

3) u₁ = 69.24 m

Therefore have to move u₁ - u ( 69.24 - 5.50) = 63.74 farther

Explanation:

Lets say that I am at a distance "u" from the TV,

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2)

P₁ = 4πu²I₁

u =√(p₁/4πI₁)

u = √(1200/4π × 10^0.5)

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The distance away from the amplifier now is 5.50 m

3)

Let I₃ be the intensity corresponding to required sound level 85 dB

85 = 10log(I₃/10⁻¹²)

8.5 = log (I₃/10⁻¹²)

10^8.5 = I₃ / 10^-12

I₃ = 10^8.5  × 10^-12

I₃ = 10^-3.5 w/m²

Now, I ∝ 1/u²

so I₂/I₃ = u₁²/u²

u₁ = √(I₂/I₃) × u

u₁ = √(10^-1.3 / 10^-3.5) ×  5.50

u₁ = 69.24 m

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