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meriva
3 years ago
10

Some thermal containers have layers of materials to keep drinks cold for as long as possible. Which design would help keep ice f

rozen for the longest period?​
A. Inner core of steel, no air gap, outer layer of plastic

B. Inner core of steel, air gap, outler layer of glass

C. Inner core of steel, no air gap, outer layer of plastic

D. Inner core of glass, air gap, outer layer of glass


I know A. and C. are the same, but those are my options.
Physics
2 answers:
MakcuM [25]3 years ago
8 0

Answer:

D.

Explanation:

grin007 [14]3 years ago
5 0
The answer is D correct me if I’m wrong
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You are standing at the top of a cliff that has a stairstep configuration. There is a vertical drop of 7 m at your feet, then a
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Answer:

1. v = 6.67 m/s

2. d = 9.54 m

Explanation:

1. To find the horizontal velocity of the rock we need to use the following equation:

d = v*t \rightarrow v = \frac{d}{t}    

<u>Where</u>:

d: is the distance traveled by the rock

t: is the time

The time can be calculated as follows:

t = \sqrt{\frac{2d}{g}}

<u>Where:</u>

g: is gravity = 9.8 m/s²

t = \sqrt{\frac{2d}{g}} = \sqrt{\frac{2*7 m}{9.8 m/s^{2}}} = 1.20 s

Now, the horizontal velocity of the rock is:

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Hence, the initial velocity required to barely reach the edge of the shell below you is 6.67 m/s.          

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So, the distance is:

d = v*t = 6.67 m/s*1.43 s = 9.54 m    

Therefore, the projectile will land at 9.54 m of the second cliff.

I hope it helps you!        

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