2 years ago

Which diagram best illustrates what happens when electromagnetic waves strike a reflective material? ANSWER: D

2 answers:

6 0

We have no way to tell whether the answer is really D,
because you haven't posted the choices, so we don't
know what ' D ' says.

I hope you were helpful to yourself.

guapka [62]2 years ago

4 0

Answer:

The answer is D

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With what minimum speed must you toss a 200 g ball straight up to just touch the 12-m-high roof of the gymnasium if you release

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v = 14.41 m/s

Explanation:

It is given that,

mass of the ball, m = 200 g = 0.2 kg

Height of the roof, h = 12 m

The ball is tossed 1.4 m above the ground, h' = 1.4 m

Let v is the minimum speed with which the ball is tossed. Using the conservation of energy to find it as :

$E_p=E_k$

$mg(h-h')=\dfrac{1}{2}mv^2$

$g(h-h')=\dfrac{1}{2}v^2$

$v=\sqrt{2g(h-h')}$

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