A car is driving northwest at v mph across a sloping plain whose height, in feet above sea level, at a point N miles north and E
2 answers:
Answer: The car is driving northwest at v mph.
if h(N,E) = 4750 + 75N + 100E
where N is the miles north, and E the miles at east.
But the car is moving northwest, so we should replace E for -W, then
h(N,W) = 4750 + 75N -100W
Now this equation says that for each mile to the north, the height increases by 75 miles, and for each mile to west, the height decreases by 100 miles.
So if the car is moving exactly at northwest, for each mile it does to north, also does one mile to west, This means that for each mile to north (or west), the height decreases by 25 miles.
then if the car does V miles per hour, then the velocity pointing north and west are the same, and are Vₙ = V/
if the car does X =Vₙ*1h miles in one hour, then the Height will decrease by X*25 per hour
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Explanation:
The electro magnetic force is given by
F =
where and
are charged particles
k =Coulombs constant
r = distance between two charges
And gravitational force is given by
F =
where and
are masses
G =Garvitation constant
r = distance between two masses
Now since the planets, stars and galaxies are electrically neutral, therefore they have zero electrical charge and so electro magnetic forces have no affect on these planets, stars and heavenly bodies.
Whereas the masses of the heavenly bodies are very large, so they are largely affected by the gravitational force since Gravitational force is directly proportional to the product of the masses of a body.
Therefore, though the electromagnetic force is stronger than the gravitational force, the electromagnetic force does not dominate the forces in the heavenly bodies as they as not electrically charged.