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just olya [345]
3 years ago
13

The manufacturer of a bulletproof vest wants the vest to be able to stop a bullet with a mass of 0.4 kg and a velocity of 1800 m

/s. what is the momentum of this bullet?
a. 720 kg×m/s
b. 740 kg×m/s
c. 820 kg×m/s
d. 4500 kg×m/s
Physics
1 answer:
11111nata11111 [884]3 years ago
7 0
We know that momentum = mass times velocity
So a. 720 kgm/s
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To add the two vectors analytically you decompose each vector into their vertical and horizontal components.

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  • Vertical component: 18 mph × sin (327º) = - 9.80 mph

  • Vector notation:

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  • Horizontal component: 4 mph × cos (60º) = 2.00 mph

  • Vertical component: 4 mph × sin (60º) = 3.46 mph

  • Vector notation:

       2.00\hat i+3.46\hat j

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You add the corresponding components:

15.10\hat i-9.80\hat j+2.00\hat i+3.46\hat j\\ \\ 17.10\hat i-6.34\hat j

To find the magnitude use Pythagorean theorem:

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<u>4. Direction:</u>

Use the tangent ratio:

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Find the inverse:

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