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expeople1 [14]
3 years ago
5

4

Physics
1 answer:
Blizzard [7]3 years ago
6 0

Answer:

0.2 J

Explanation:

The pendulum forms a right triangle, with hypotenuse of 50 cm and base of 30 cm.  The height of this triangle can be found with Pythagorean theorem:

c² = a² + b²

(50 cm)² = a² + (30 cm)²

a = 40 cm

The height of the triangle is 40 cm.  The height of the pendulum when it is at the bottom is 50 cm.  So the end of the pendulum is lifted by 10 cm.  Assuming the mass is concentrated at the end of the pendulum, the potential energy is:

PE = mgh

PE = (0.200 kg) (9.8 N/kg) (0.10 m)

PE = 0.196 J

Rounding to one significant figure, the potential energy is 0.2 J.

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John and Caroline go out for a walk one day. This graph represents their distance from home.
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Answer:

Option C is the correct answer.

Explanation:

  We have velocity of a body = Change in position/ Time.

  Considering first portion of graph,

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  Considering second portion of graph,

  Change in position = 30 - 30 = 0 m

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 Considering third portion of graph,

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Option C is the correct answer.

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3 years ago
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