Answer:
(B) Parachutes
Explanation:
Air resistance works to slow down trains and airplanes, so it isn't desirable. Air resistance also causes pendulums to slow and stop.
Parachutes need air resistance to slow a person's fall. So air resistance is desirable here.
Answer:

Explanation:
Let's see how we can approach the problem:
Using a simple simulation:
One octave separation = 2 x the length = 1/2 length
Two octaves separation = 4 x the length = 1/4 length
Three octaves separation = 8 x the length = 1/8 length
Four octaves separation = 16 x the length = 1/16
and so on...
As we can see, the length is decreasing by a factor of 
Answer:
D) Argon because of 18 protons
Explanation:
An element is defined by the # of protons it has. Argon is the only element with 18 protons, so it is the answer.
hope this helps! <3
<u />Aku udah tanya ama orang yang ngerti tafsiran kemarin, artinya kamu punya suatu masalah yang terpendam pada orang tua kamu.
Maksud dari mandi bersama dalam konteks mimpi ini adalah kalian harus membersihkan semuar rasa permasalahan - permasalahan yang kalian pendam dari diri kalian dan mulai hubungan kalian dari awal dengan hati yang bersih
Answer:
Pressure
Explanation:
The measure of how much force is applied to an object from gas particle bouncing into it is called pressure.
Pressure is defined as the force per unit area on a body.
Mathematically;
Pressure = 
The pressure of a gas is the combined force with which gas molecules bombard a unit area of the wall of the container. It is the sum of all tiny pushes on the wall of the container.
Various units of pressure are atm, mmHg, torr, pascal e.t.c