Explanation:
<h3>We have for velocity of package v= 20 - 9.8t and for distance from the ground y = h + 20t - 4.9t2.</h3><h3>We have y = 0 and t = 18.0 s we have h = 4.9·182 - 20·18 = 1227.6 m.</h3><h3>Velocity at landing v = 20 - 9.8·18 = - 156.4 m/s </h3>
The temperature difference between the wooden wall is 16⁰C, and the heat current per square metre of the wall is 7,325 W/m².
<h3>
Temperature difference between the wooden wall</h3>
The temperature difference between the wooden wall is calculated as follows;
- Let the brick wall = wall A
- Let the wooden wall = wall B
- Let the area of the walls = A

<h3 /><h3>Heat flowing in the walls</h3>
Q = KL(ΔT)
Q = 0.5 x 0.1 x (20 + 273)
Q = 14.65 W
<h3>Heat current per square meter of the Walls</h3>
QA = W/A
QA = (14.65)/A
- Let the area of the wall = 10 cm x 2 cm = 0.1 m x 0.02 m = 0.002 m².
QA = 14.65/0.002
QA = 7,325 W/m²
Learn more about thermal conductivity here: brainly.com/question/11213835
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Answer:
reflection of water ,sound and water waves etc