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lisov135 [29]
3 years ago
13

Aluminum foil has a shiny side and a dull side. Many experts believe that the shiny side of the aluminum foil should face the fo

od when you are using it to cover the food. What process would explain the reason why the shiny side should face the food?
A) conduction.
B) convection.
C) insulation.
D) radiation.
Physics
2 answers:
Goshia [24]3 years ago
5 0

Answer: D) Radiation.

Explanation: The shiny side of the aluminum foil is better at reflecting electromagnetic waves or radiation, so if this side faced the other side, it will prevent some radiated heat to reach the food, which is counterproductive.

When this side faces the food, it also prevents the heat radiated from the food to leave it, so it is actually beneficial.

So the correct answer of why this side should face the food is option D) Radiation

ra1l [238]3 years ago
3 0

Answer:

C

Explanation:

Insulation

Aluminum foil are really good at keeping the food warm because of its insulation property that it does not let the heat of food go out

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A ball on a string makes 25.0 revolutions in 9.37 s, in a circle radius 0.450 m. What is it’s velocity?
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The velocity of the ball is 12.5 m/s

Explanation:

The velocity of the ball is given by the ratio between the distance covered by the ball and the time taken:

v=\frac{d}{t}

First, we calculate the distance covered. We know that the radius of the circle is

r = 0.450 m

And the length of the circumference is

L=2\pi r = 2\pi(0.750)=4.7 m

The ball makes 25.0 revolutions, so a total distance of

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In a time of

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v=\frac{117.5}{9.37}=12.5 m/s

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2 years ago
A glider is gliding through the air at a height of 416 meters with a speed of 45.2 m/s. The glider
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There's not enough information to find an answer.

I think the idea here is that in descending (416 - 278) = 138 meters,
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How much force is required to accelerate a 12 kg mass at 5 m/s 2
Savatey [412]

Answer:

60 N

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F = m*a

F = ?

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2 years ago
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