Answer:
V = I × R and the power law equation (formula): P = I × V. P = power
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Answer:
11.18 minutes
Explanation:
We shall apply Newton's law of cooling
Rate of cooling ∝ Temperature difference
(T₂ - T₁ ) / t = k ( T₁ + T₂ / 2 - T )
A body cools from temperature of T₂ TO T₁ in time t , K being a constant.
(T₁ + T₂) /2 is the average temperature and T is temperature of surrounding.
Using the data given in the problem ,
For cooling from 425 degree to 300 degree
![\frac{425-300}{5} =k(\frac{425+300}{2}-71)](https://tex.z-dn.net/?f=%5Cfrac%7B425-300%7D%7B5%7D%20%3Dk%28%5Cfrac%7B425%2B300%7D%7B2%7D-71%29)
![\frac{125}{5}= k x 291.5](https://tex.z-dn.net/?f=%5Cfrac%7B125%7D%7B5%7D%3D%20k%20x%20291.5)
For cooling from 425 to 135 in time t we have
[/tex]
= 209k
From these two equations we get the value of t as
t = 16.18 s
So time required to cool from 300 to 135 degree isas follows
16.18 - 5 = 11.18 s
Answer:
a. It would shrink
b. It would expand
Explanation:
a. Since the water bottle is filled with air at atmospheric pressure at 20000 ft, and since atmospheric pressure decreases with altitude, when we go up in elevation.
The pressure exerted by the molecules of air in the water bottle seek to balance out the atmospheric pressure as we go higher. Since the atmospheric pressure exerted by the molecules of air in the atmosphere are greater than that exerted by the molecules of air in the water bottle, this causes the volume of the water bottle to decrease and thus shrinks the water bottle until the pressure balances out
b. Since the water bottle is filled with air at atmospheric pressure at 20000 ft, and since atmospheric pressure increases with decreasing altitude, when we go down in elevation.
The pressure exerted by the molecules of air in the water bottle seek to balance out the atmospheric pressure as we go lower. The water bottle expands until the atmospheric pressure outside equals the pressure inside the water bottle.this causes the volume of the water bottle to increase and thus expands the water bottle until the pressure balances out
Answer:
<h2>100,000 J</h2>
Explanation:
The kinetic energy of an object can be found by using the formula
![k = \frac{1}{2} m {v}^{2} \\](https://tex.z-dn.net/?f=k%20%3D%20%20%5Cfrac%7B1%7D%7B2%7D%20m%20%7Bv%7D%5E%7B2%7D%20%20%5C%5C%20)
m is the mass
v is the velocity
From the question we have
![k = \frac{1}{2} \times 2000 \times {10}^{2} \\ = 1000 \times 100 \\ = 100000](https://tex.z-dn.net/?f=k%20%3D%20%20%5Cfrac%7B1%7D%7B2%7D%20%20%5Ctimes%202000%20%5Ctimes%20%20%7B10%7D%5E%7B2%7D%20%20%5C%5C%20%20%3D%201000%20%5Ctimes%20100%20%5C%5C%20%20%3D%20100000)
We have the final answer as
<h3>100,000 J</h3>
Hope this helps you