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DochEvi [55]
3 years ago
12

!! 50 points spent, easy points for you. 8th-grade science/physics !!

Physics
1 answer:
luda_lava [24]3 years ago
7 0

Answer:

1.mirage

2.lens

3.concave lens

4.convex lens

5.index of refraction

Explanation:

IQ=999999

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An astronaut is walking in space. Which of these would have the greatest speed as observed by the astronaut?
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The answer is C) an electromagnetic wave

An electromagnetic wave, which includes electromagnetic radiation such as visible light, moves the fastest of all of the options listed by a significant margin, especially through space. In fact, light travelling through space is technically the theoretical limit of how fast something can travel. 
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A 98 N ball is suspended from a cable so that it hangs 3.5 m above the earth. Find the mass of the ball and the
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A 2.35-kg rock is released from rest at a height of 21.4 m. Ignore air resistance and determine (a) the kinetic energy at 21.4 m
kvasek [131]

Explanation:

Given that,

The mass of rock, m = 2.35-kg

It was released from rest at a height of 21.4 m.

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As the rock was at rest initially, it means, its kinetic energy is equal to 0.

(b) The gravitational potential energy is given by : E_p=mgh

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Explanation:

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