Answer: B. 16 times
Explanation:
The mathematic expression for a magnetic force 
between two magnets is:
(1)
Where:
is a constant
and 
are the magnetic charges, which depends on the size of each magnet
is the distance beteween both magnets
As we can see, this force in inversely proportional to the square of the distance. This means that if we increase the distance, the magnetic force will decrease.
Now, if we increase this value by 4 inches from 1 inch:
(2)
(3)
This means the strength of attraction will be 16 times weaker.
Answer:
X = 6910319.7 m
Explanation:
let X be the distance where the acceleration of gravity is 85% of what it is on the surface and g1 be the acceleration of gravity at the surface and g2 be the acceleration of gravity at some distance X above the surface.
on the surface of the earth, the gravitational acceleration is given by:
g1 = GM/(r^2) = [(6.67408×10^-11)(5.972×10^24)]/[(6371×10^3)^2] = 9.82 m/s^2
at X meters above the earth's surface, g2 = 85/100(9.82) = 8.35m/s^2
then:
g2 = GM/(X^2)
X^2 = GM/g2
X = \sqrt{GM/g2}
= \sqrt{(6.67408×10^-11)(5.972×10^24)/ 8.35
= 6910319.7 m
Therefore, the acceleration of gravity becomes 85% of what it is on the surface at 6910319.7 m .
You times the 6 by the 350 duvided 1.8
Answer:
The coin roll up to 11.57 cm at 30° incline plane.
Explanation:
Given that,
Diameter = 3.00 cm
Angle = 30.0 °
Angular speed = 60.0 rad/s
We need to calculate the length
Using conservation of energy
Put the value into the formula
Hence, The coin roll up to 11.57 cm at 30° incline plane.
Answer:
I = 0.2934 I₀
Explanation:
The expression that governs the transmission of polarization is
I = I₀ cos² θ
Let's apply this to our case, when the unpolarized light enters the first polarized, the polarized light that comes out has the intensity of
I₁ = I₀ / 2
this is the light that enters the second polarizer
I = I₁ cos² θ
we substitute
I = I₀ / 2 cos² 40
I = I₀ 0.2934
I = 0.2934 I₀
