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Elenna [48]
2 years ago
10

A rock is dropped straight down from roof. It hits the ground with a velocity of 28.2 m/sec. How high was the roof, and how long

did it take to hit the ground?
Physics
1 answer:
notsponge [240]2 years ago
6 0

Answer:

18 secs

Explanation:

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Answer:

The choice D.

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An RL series circuit is connected to an ac generator with a maximum emf of 20 V. If the maximum potential difference across the
Rama09 [41]

If the maximum emf of the ac generator is 20 V and the maximum potential difference across the resistor is 16 V Then the maximum potential difference across the inductor is 4 V.

Calculation:

Step-1:

It is given that the RL circuit is connected to a 20 V ac generator. The maximum potential difference across the resistor is 16 V. It is required to find the maximum potential drop across the inductor.

Step-2:

The maximum emf of the generator is equal to the sum of the maximum potential difference across the resistor and the maximum potential difference across the inductor.

Therefore,

The maximum potential difference across the inductor + Maximum maximum potential difference across the resistor = Maximum emf of the generator

Thus,

Maximum maximum potential difference across the inductor + 16 V = 20 V

Therefore,

Maximum maximum potential difference across the inductor = 20 V - 16 V = 4 V

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5 0
1 year ago
Electromagnetic waves differ from other types of waves because they are
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What is atomic theory and how has it changed over time?
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6 0
3 years ago
Read 2 more answers
If the focal length of a concave mirror is 18cm, find its radius of curvature.
Galina-37 [17]

Given :

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To Find :

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Solution :

We know,

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Therefore, the radius of curvature of concave mirror is 36 cm.

Hence, this is the required solution.

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3 years ago
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