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iragen [17]
3 years ago
10

A stone is thrown vertically upward from the top of a platform with an initial velocity of 10m/s. Calculate the height of the pl

atform if it takes the stone 10secs to reach the ground. (g=10m/s2).​
Physics
1 answer:
insens350 [35]3 years ago
5 0

Answer:

400 meters

Calculate how much time the stone take to achieve the highest point of its trajectory:

0 - 10 = -10 • t

-10 = -10t

t = -10/-10

t = 1

So, it took 1 second to achieve the highest point of trajectory. When the stone achieves it, its have velocity 0 and begin to fall, and it takes also 1 second to return to the top of the platform, so it means that during 2 seconds of the motion. The stone achieves the same high as the platform with the velocity of 10 m/s

Now let's calculate the distance its traveled to achieve the ground:

X = 10•8 + (10•8²)/2

X = 80 + 320

X = 400 meters

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Explanation:

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Incomplete Question.The Complete question is

The Earth spins on its axis and also orbits around the Sun. For this problem use the following constants.  Mass of the Earth: 5.97 × 10^24  kg (assume a uniform mass distribution)  Radius of the Earth: 6371 km  Distance of Earth from Sun: 149,600,000 km

(i)Calculate the rotational kinetic energy of the Earth due to rotation about its axis, in joules.

(ii)What is the rotational kinetic energy of the Earth due to its orbit around the Sun, in joules?  

Answer:

(i) KE= 2.56e29 J

(ii) KE= 2.65e33 J

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I = (2/5)mr² = (2/5) * 5.97e24kg * (6.371e6m)²

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(ii) About the sun,

I = mR²

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and the angular velocity

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KE= 2.65e33 J

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