Answer:
Unit
Explanation:
The reference standard used for the measurement of physical quantity is called the unit of that quantity.
Most units follow an agreed system of expressing quantities across all instances of such quantity.
- It is necessary to standardized units because it makes comparison easier.
- It also makes scientific communication easily discernible.
To make salt water a heterogeneous mixture, you would have to add sand and that's is how to make a salt water with heterogeneous mixture.
A is correct answer.
Hope it helped you.
-Charlie
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Answer:
∆h = 0.071 m
Explanation:
I rename angle (θ) = angle(α)
First we are going to write two important equations to solve this problem :
Vy(t) and y(t)
We start by decomposing the speed in the direction ''y''


Vy in this problem will follow this equation =

where g is the gravity acceleration

This is equation (1)
For Y(t) :

We suppose yi = 0

This is equation (2)
We need the time in which Vy = 0 m/s so we use (1)

So in t = 0.675 s → Vy = 0. Now we calculate the y in which this happen using (2)

2.236 m is the maximum height from the shell (in which Vy=0 m/s)
Let's calculate now the height for t = 0.555 s

The height asked is
∆h = 2.236 m - 2.165 m = 0.071 m