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frutty [35]
2 years ago
5

If humans originated in Africa and migrated to other parts of the world some time would be required for this to occur.At the mod

est rate of one kilometer per year, how many centuries would it take for humans originated in Africa to travel to China, some 10,000 kilometers away? ​
Physics
1 answer:
Thepotemich [5.8K]2 years ago
7 0

Answer:

100 years

Explanation:

10,000 divided by 100 equals 100

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How many miles of MgCI2 are there in 339g of compound?
harkovskaia [24]

I'm going to answer this by using rounded numbers for the atomic masses. You need only go back and put the numbers in from your periodic table. My answers will be close, but not what you should get.

Find the Molar Mass of MgCl2

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Total  =              95 grams

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1 mole = 95 grams

x mol = 339

Solve

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A young man exerted a force of 9,000 N on a stalled car but was unable to move it. How much work was done?
olasank [31]
W=F*s
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2 years ago
A box is pushed 40 m by a mover. The amount of work done was 2,240 j. How much force was exerted on the box
Georgia [21]

The force exerted on the box is 56 N

Explanation:

The work done by a force on an object is given by

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d is the displacement of the object

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For the box in this problem, we have:

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d = 40 m is the displacement of the box

Assuming that the  force is parallel to the displacement, \theta=0

Solving the equation for F, we find the force exerted on the box:

F=\frac{W}{d cos \theta}=\frac{2240}{(40)(cos 0)}=56 N

Learn more about work:

brainly.com/question/6763771

brainly.com/question/6443626

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Explanation:

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