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Elanso [62]
3 years ago
9

A car speeds up and accelerates for 5.1 seconds at a rate of 2.2 m/s2. if the car's initial velocity was 9.3 m/s, what was the c

ar's final velocity
after accelerating?
-9.7m/s
-11.2m/s
1.9m/s
20.5m/s
Physics
1 answer:
sp2606 [1]3 years ago
6 0

Recall the definition of average acceleration:

<em>a</em> = (<em>v</em> - <em>u</em>)/∆<em>t</em>

where <em>u</em> and <em>v</em> are the initial and final velocities, respectively.

So we have

2.2 m/s² = (<em>v</em> - 9.3 m/s) / (5.1 s)

<em>v</em> - 9.3 m/s = (2.2 m/s²) * (5.1 s)

<em>v</em> = 9.3 m/s + (2.2 m/s²) * (5.1 s)

<em>v</em> = 20.52 m/s ≈ 21 m/s

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a solution made by dissolving 116 g of CaCl2 in 64 g of water has a density of 1.180 g/ml at 20 degrees celsius what is the mola
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Answer:

The molarity of CaCl2 in the solution is 4.94 M

Explanation:

First of all you need to calculate CaCl2 mass.

You have one atom of Ca = 40.07 g/mol and two atoms of Cl = 35.45 g/mol so the molecule has a mass of 110.97 g/mol.

Now, knowing that your solution will have a mass of 64 grams of water + 116 grams of CaCl2 = 180 grams, you can calculate its volume, knowing that density = mass/volume

density x mass = volume --> 1,180 g/ml x 180 g = 212.4 ml

In 212.4 ml, you have 116 grams of CaCl2. You can calculate how many moles of CaCl2 you have:

110.97 g ------ 1 mol

116 g -------- x = (116 g x 1 mol) / 110.97 g =  1.05 moles

The molarity in a solution equals how many moles of a certain solute you have in 1000 ml of solution. In this solution, you have 1.05 moles in 212.4 ml, so in 1000 ml you will have:

212.4 ml ------- 1.05 moles

1000 ml -------- x = (1000 ml x 1.05 moles) / 212.4 ml = 4.94 moles.

This means the molarity of CaCl2 in the solution is 4.94 M.

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So, what is the answer of this assignment?
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