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ss7ja [257]
2 years ago
7

(8th grade HELP)

Physics
1 answer:
Shalnov [3]2 years ago
4 0
What is the question your asking
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4. A rock is thrown from the edge of the top of a 100 m tall building at some unknown angle above the horizontal. The rock strik
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Answer:

Explanation:

Let the velocity of projectile be v and angle of throw be θ.

The projectile takes 5 s to touch the ground during which period it falls vertically by 100 m

considering its vertical displacement

h = - ut +1/2 g t²

100 = - vsinθ x 5 + .5 x 9.8 x 5²

5vsinθ =  222.5

vsinθ = 44.5

It covers 160 horizontally in 5 s

vcosθ x 5 = 160

v cosθ = 32

squaring and adding

v²sin²θ +v² cos²θ = 44.4² + 32²

v² = 1971.36 + 1024

v = 54.73 m /s

5 0
3 years ago
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Central maximum = d* wavelength/ D
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12*10-^3 = 3.4*6.32*10-^7/D
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D = 1.79*10-^4 m
3 0
3 years ago
A group of tissues working together to perform a similar function.
inn [45]

Answer:

organ

Explanation:

7 0
3 years ago
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What is the resultant of the vectors shown?
ad-work [718]

Answer:

Option B

Explanation:

Option A is the wrong answer because the horizontal vector is in the opposite direction.

Option C is the wrong answer as the horizontal vector is in the opposite direction and all the vectors are connected head to tail [of the arrows] [Triangle law of vector addition]

Option D is the wrong answer as the horizontal vector is in the opposite direction.

5 0
2 years ago
What unit is used to measure force?
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Answer:

a

b

a

d

9

Explanation:

6 0
3 years ago
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