Resistance ∞ (proportional) length
resistance ∞ 1/ area
therefore,
(the constant that we take is known as the resistivity)
resistance = (resistivity*length )/ area
resistivity = (resistance * area ) / length
= (3 * 45) / 3 = 135/3 = 45 Ωm
in short your answer is 45 Ωm
Answer:
<em>D.) Object 1 has 4x the kinetic energy of object 2</em>
Explanation:
<u>Kinetic Energy
</u>
Is the type of energy an object has due to its state of motion. It is proportional to the square of the speed.
The formula for the kinetic energy is:
Where:
m = mass of the object
v = speed at which the object moves
Now suppose we have two objects with the same mass m1=m2=m and object 1 moves twice as fast as object 2, that is:
Let's compute their kinetic energies:
Since v1=2v2, the first kinetic energy is:
Dividing both equations:
Simplifying:
Or, equivalently:
Answer:
D.) Object 1 has 4x the kinetic energy of object 2
It would be balanced. (No acceleration - No change in motion)
Explanation:
the formula is given by :
F=<u>Gm'•m"/</u> r²
where F is the force pulling them towards each other
G is the universal gravitational constant
m'andm" are the masses in contact
and r is the separation between the balls
so we just need to substitute the values and find r ,the gravitational constant is 6.67x10-¹¹. r=Gm'm"/F
Answer:
Explanation:
For acceleration due to gravity g , the expression is
g = GM / R² , where G is gravitational constant M is mass of the earth and R is radius of the earth .
At height h , let the value of it becomes g / 4 , so
g / 4 = GM / ( R + h )²
dividing
4 = [( R+ h)² / R² ]
2 = (R + h) / R
2 = 1 + h / R
h / R = 1
h = R
So at height equal to radius of the earth , acceleration due to gravity becomes 1 /4 of value on the surface of the earth .