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Romashka [77]
3 years ago
7

12. In which of the positions shown in the picture, will Joshua have both potential and kinetic energy?​

Physics
1 answer:
Zielflug [23.3K]3 years ago
8 0

Answer:

<em>Answer: D. Only R</em>

Explanation:

<u>The Principle Of Conservation Of Mechanical Energy</u>

In the absence of friction, the total mechanical energy is conserved. That means that

Em=U+K is constant, being U the potential energy and K the kinetic energy.

At the top of the path (point Q), Joshua is at rest but his height is at a maximum. Thus his kinetic energy is zero.

At point P, Joshua is at the minimum level (potential energy zero) and his speed is at a maximum.

At point R, Joshua has some height and some speed which means he has both types of energy.

Answer: D. Only R

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galina1969 [7]

Answer:

A) the current in AC electricity varies in magnitude and direction.

C) the voltage in AC electricity varies in magnitude and direction.

Explanation:

In DC current and voltage the direction of current will not change with time and it always remains the same.

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While in AC voltage and AC current the direction of AC will change with time

periodically.

So here magnitude and direction both will change in AC current and AC voltage.

so the correct answer is

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<u>Explanation:</u>

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