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Andreyy89
3 years ago
8

At a camp site there are tents of 2 shades. 1 made with black fabric and the other with white fabric. Which one will you prefer

for resting on a hot summer afternoon. Give reason for your choice
Physics
1 answer:
Scorpion4ik [409]3 years ago
6 0

Answer:

Explanation:

On a hot summer afternoon the tent made up of white fabric will be preferred because white colour is a bad absorber and good reflector of heat. Hence, it will be more convenient to stay under fabric tent made of white during this season because heat will be reflected which makes shade provided by such tent to be cool and enjoyable.

While the black fabric tent will be preferred during winter because black materials are good absorber of heat and are poor reflector.

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3 years ago
A woman with mass 50 kg is standing on the rim of a large disk that is rotating at 0.80 rev/s about an axis through its center.
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Answer:

angular momentum, L=1.4\times 10^4\ kg-m^2/s

Explanation:

Given that,

Mass of the woman, m = 50 kg

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Mass of the disk, m' = 2670 kg

Radius of the disk, R = 4 m

We need to find the magnitude of the total angular momentum of the woman–disk system. The moment of inertia of the system is equal to the sum of moment of inertia of women and the moment off inertia of the disk.

I=mR^2+\dfrac{1}{2}m'R^2\\\\I=R^2(m+\dfrac{1}{2}m')\\\\I=(4)^2\times (50+\dfrac{1}{2}\times 270)\\\\I=2960\ kg-m^2

The angular momentum is given by :

L=I\omega\\\\L=2960\times 5.02\\\\L=14859.2\ kg-m^2/s

or

L=1.4\times 10^4\ kg-m^2/s

So, the magnitude of the total angular momentum of the woman–disk system is 1.4\times 10^4\ kg-m^2/s. Hence, this is the required solution.

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