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Snezhnost [94]
3 years ago
13

Which of the following forms of electromagnetic waves is LEAST dangerous to the human body?

Physics
2 answers:
makkiz [27]3 years ago
5 0
<span>Which of the following forms of electromagnetic waves is LEAST dangerous to the human body? B
</span>
EastWind [94]3 years ago
5 0
The answer would be B;

<span>ultraviolet rays
</span>
Have a wonderful day! :D
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A roller coaster car may be approximated by a block of mass m. Thecar, which starts from rest, is released at a height h above t
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The first part can be solved via conservation of energy.

mgh = mg2R + K\\K = mg(h-2R)

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the free body diagram of the car should be as follows:

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- normal force of the track to the car in the downwards direction

The total force should be equal to the centripetal force by Newton's Second Law.

F = ma = \frac{mv^2}{R}\\mg + N = \frac{mv^2}{R}

where N = 0 because we are looking for the case where the car loses contact.

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Now we know the minimum velocity that the car should have. Using the energy conservation found in the first part, we can calculate the minimum height.

mgh = mg2R + \frac{1}{2}mv^2\\mgh = mg2R + \frac{1}{2}m(gR)\\gh = g2R + \frac{1}{2}gR\\h = 2R + \frac{R}{2}\\h = \frac{5R}{2}

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The point that might confuse you in this question is the direction of the normal force at the top of the loop.

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