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Ivan
3 years ago
12

A janitor comes across a spilled substance on the floor of a highschool chemistry lab. he wants to make sure that the liquid is

neutral before cleaning it up. what would be safest to add to the puddle?
a. pour on a base
b. pour on a buffer
c. pour on a acid
Physics
1 answer:
MAVERICK [17]3 years ago
5 0
A is the answer I think
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I believe the answer is C. Hope this helps!!

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A commuter airplane starts from an airport and takes theroute. The plane first flies to city A, located 175 km away in a directi
bearhunter [10]

Answer:

245.45km in a direction 21.45° west of north from city A

Explanation:

Let's place the origin of a coordinate system at city A.

The final position of the airplane is given by:

rf = ra + rb + rc    where ra, rb and rc are the vectors of the relative displacements the airplane has made. If we separate this equation into its x and y coordinates:

rfX = raX+ rbX + rcX = 175*cos(30)-150*sin(20)-190 = -89.75km

rfY = raY + rbY + rcT = 175*sin(30)+150*cos(20) = 228.45km

The module of this position is:

rf = \sqrt{rfX^2+rfY^2} = 245.45km

And the angle measure from the y-axis is:

\alpha =atan(rfX/rfY) = 21.45\°

So the answer is 245.45km in a direction 21.45° west of north from city A

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