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STatiana [176]
3 years ago
5

Mary and Alice were collecting the data for the class. Both girls were wearing white T-shirts. Billy came out to help them; he w

as wearing a dark navy T-shirt. "Boy, it is really hot out here," exclaimed Billy. The girls said they were not hot at all. Using the student experiment and the collected data, elaborate on the reason for the students' comments. A) White T-shirts reflect sunlight. Black T-shirts do not. B) White T-shirts did not absorb as much sunlight as dark T-shirts. C) Dark T-shirts are heavier than white T-shirts so Billy felt hotter than the girls. D) The girls had been outside in the sun for an hour and the heat did not bother them.
Physics
2 answers:
erma4kov [3.2K]3 years ago
3 0

Answer:

B

Explanation:

Because it has to do with the darker the object the better it emitts heat.

bekas [8.4K]3 years ago
3 0

Answer:

The boy said it was hot due to the darker clothing absorbing more light than reflecting it.

The girls didn't feel hot because the colour white reflects all light. (it doesn't absorb any colour, hence it being white)

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A car starts from rest and accelerates uniformly at 2.0 m/s2 toward the north. A second car starts from rest 4.0 s later at the
yKpoI14uk [10]

Answer:

the correct solution is 13 s

Explanation:

This is a kinematic problem, let's use accelerated rectilinear motion relationships.

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The second car leaves the same point, but 4.0 seconds later

       x = v₀₂ (t-4) + ½ a₂ (t-4)²

With this form we use the same time for both cars.

The initial speeds are zero for both vehicles leave the rest, at the point where they are located has the same position

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Let's solve

       a₁  t² = a₂ (t-4)²

      a₁/a₂ t² = t² -2 4 t + 16

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      t² 0.5 - 8 t +16 = 0

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Let's solve the second degree equation

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Solutions

     t1 = 13.66 s

     t2 = 2.34 s

These are the mathematical solutions for the meeting point, but car 2 leaves after 4 seconds, so the only solution is 13.66 s

the correct solution is 13 s, if you have to select one the nearest 12s

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