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mario62 [17]
3 years ago
5

A bags shed and he balls stand slap DC dmss

Physics
1 answer:
Natalija [7]3 years ago
7 0

Answer:

is that a question...?

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What relationship between the sun and earth did copernicus formulate?
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The astronomical model created and published by Nicholas Copernicus in the year 1543 is called Copernican heliocentrism. The model set the Sun in immobile position near the center of the solar system with Earth, as well as the other planets, spherical, epicycled and at consistent frequencies around it.

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PLEASE HELP, evaporation,liquids,solids, and gases involved
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Which current is produced in homes
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6 0
3 years ago
Read 2 more answers
5.3 two 30 kg children in a 20 kg cart are stationary at the top of a hill. They start rolling down the 80 m tall hill and they
Makovka662 [10]

Answer:

<em>60008.4 J</em>

<em></em>

Explanation:

The mass of each kid = 30 kg

mass of the cart = 20 kg

The speed of the cart down the hill = 30 km/hr = 30 x 1000/3600 = 8.33 m/s

The height of the hill = 80 m

The potential energy of the boys at the top of the hill = mgh

where

m is the total mass of the kids and the cart = (30 x 2) + 20 = 80 kg

g is the acceleration due to gravity = 9.81 m/s^2

h is their height above the ground = 80 m (on the top of the hill)

substituting, we have

potential energy PE = 80 x 9.81 x 80 = 62784 J

At an instance at the bottom of the hill

their kinetic energy = \frac{1}{2} mv^2

where

v is their velocity = 8.33 m/s

m is their total mass = 80 kg

substituting, we have

kinetic energy KE = \frac{1}{2}*80*8.33^2 = 2775.6 J

Total work done on the cart is equal to the energy lost by the cart when it reached the bottom of the hill

work done by friction = PE - KE = 62784 - 2775.6 = <em>60008.4 J</em>

5 0
3 years ago
Light travels 300 000 000 m/s and one year has approximately 32 000 000 second a light year is the distance light travels in one
Lelu [443]

Explanation:

It is given that,

Speed of light, v=300 000 000\ m/s=3\times 10^8\ m/s

Seconds in 1 year, t=32 000 000=32\times 10^6\ s

We need to find the distance traveled by light in one year. Speed of an object is given by :

v=\dfrac{d}{t}

So,

d=v\times t\\\\d=3\times 10^8\times 32\times 10^6\\\\d=9.6\times 10^{15}\ m

Since,

1\ \text{light year}=9.46\times 10^{15}\ m\\\\1\ m=\dfrac{1}{9.46\times 10^{15}}\ \text{ly}\\\\9.6\times 10^{15}\ m=\dfrac{9.6\times 10^{15}}{9.46\times 10^{15}}\\\\d=1.01\ \text{ly}

So, the distance covered by light is 1.01 light years.

8 0
3 years ago
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