The answer is A study of different surfaces to compare ability to repel water. Hope this helps!
Answer:
R = 1.8 m
Explanation:
This is a simple harmonic movement exercise, at the bottom of the swing the acceleration is vertical upwards and the speed is tangential to the trajectory, that is horizontal; the expression for the centralized acceleration is
= v² / R
R = v² /a_{c}
where the radius is equal to the length of the swing
let's calculate
R = 8.1 / 4.5
R = 1.8 m
Answer:

Explanation:
Since there is no friction angular momentum is conserved. The formula for angular momentum thet will be useful in this case is
. If we call 1 the situation when the student is at the rim and 2 the situation when the student is at
from the center, then we have:

Or:

And we want to calculate:

The total moment of inertia will be the sum of the moment of intertia of the disk of mass
and radius
, which is
, and the moment of intertia of the student of mass
at position
(which will be
or
) will be
, so we will have:

or:

which for our values is:

Answer: D. They conduct thermal and electrical energy.
Explanation:
The answer to your question is,
A scientific law.
-Mabel <3