Answer:
![F=5.91\times 10^4\ N](https://tex.z-dn.net/?f=F%3D5.91%5Ctimes%2010%5E4%5C%20N)
Explanation:
Given that,
The radius o Earth, R = 6,357,000 m
Mass of the Earth, M = 5.972 × 10²⁴ kg
The mass of an elephant, m = 6000 kg
We need to find the force of gravity on the elephant. The force acting between two objects is given by :
![F=\dfrac{GMm}{R^2}\\\\F=\dfrac{6.67\times 10^{-11}\times 5.972\times 10^{24}\times 6000}{(6,357,000 )^2}\\\\F=59141.51\ N\\\\F=5.91\times 10^4\ N](https://tex.z-dn.net/?f=F%3D%5Cdfrac%7BGMm%7D%7BR%5E2%7D%5C%5C%5C%5CF%3D%5Cdfrac%7B6.67%5Ctimes%2010%5E%7B-11%7D%5Ctimes%205.972%5Ctimes%2010%5E%7B24%7D%5Ctimes%206000%7D%7B%286%2C357%2C000%20%29%5E2%7D%5C%5C%5C%5CF%3D59141.51%5C%20N%5C%5C%5C%5CF%3D5.91%5Ctimes%2010%5E4%5C%20N)
So, the required force of gravity on the elephant is
.
Answer:
a) 3170 kw
b) 377 km^2
Explanation:
Estimate of electric power
a) Given :
Average power consumption for a family of 3 = 108.4 * 106 BTU per year = 0.0317 kw = 31.7 watts
<u>The power requirement for a city of 300000 people </u>
= 31.7 watts * 100000 = 3170000 watts = 3170 kw
b) Given :
Average solar panel insulation = 8.4 W /m^2
<u>Estimate the area of silicon solar cells required to satisfy community power requirement</u>
= (1 * 3170) * (1000/8.4 )
= 377.380 * 10^3 m2 = 377 km^2
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Answer:
The distance to the wall does not matter.
Explanation:
According to newton's third law, if you exert a force on the tennis ball to propel it northwards, it will exert equal and opposite force on you to propel you southwards. Therefore, how much you accelerate only depends on how fast you through the balls. And once a ball has left the system<em> ( consisting of you and the ball)</em>, it can no longer have an effect on you, so it doesn't matter whether the ball hits a wall nearby or the one millions of miles away.
<em>P.S: all of this is true assuming the balls don't bounce back from the wall and hit you in the face, which would surely give you additional southward acceleration, but it wouldn't be such a pleasant experience! </em>