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2 years ago

7

13. For an object to appear transparent, what interaction must occur between light waves and the object they hit?

2 answers:

Svetlanka [38]2 years ago

6 0

Answer:

The answer is B

Explanation:

The absorption happens when photons from light hit atoms and molecules, and they vibrate because of that specific interaction. Then the heat ejects from the object in the format of thermal energy.

Arisa [49]2 years ago

3 0

They are absorbed answer is B

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A block with a mass M = 4.85 kg is resting on a slide that has a curved surface. There is no friction. The speed of the block af

natali 33 [55]

Answer:

The correct option is a

Explanation:

From the question we are told that

The mass of the block is $m = 4.84 \ kg$

The height of the vertical drop is $h = 19.6 \ m$

Generally from the law of energy conservation , the potential energy at the top of the slide is equal to the kinetic energy at the point after sliding this can be mathematically represented as

$PE = KE$

i.e $m * g * h = \frac{1}{2} * m * v^2$

=> $gh = 0.5 v^2$

=> $v = \sqrt{\frac{9.8 * 19.6}{0.5 } }$

=> $v = 19.6 \ m/s$

4 0

3 years ago

Mohammad has been saving 8 each week. Today he spent 142 of the savings, and he now has 50 left. For how many weeks has he been

poizon [28]

Answer:

24 weeks

Explanation:

142+50=192

192/8=24

3 0

3 years ago

Compute the power output (watts) during one minute of treadmill exercise, given the following: Treadmill grade-10% Horizontal sp

erma4kov [3.2K]

Answer:

c. 981 watts

$P=981\ W$

Explanation:

Given:

horizontal speed of treadmill, $v=100\ m.min^{-1}=\frac{5}{3} \ m.s^{-1}$

weight carried, $w=588.6\ N$

grade of the treadmill, $G\%=10\%$

<u>Now the power can be given by:</u>

$P=v.w$

$P=588.6\times\frac{5}{3}$ (where grade is the rise of the front edge per 100 m of the horizontal length)

$P=981\ W$

6 0

3 years ago

What kind of friction exists between solid objects moving in water?

eduard

Fluid Friction exists when it is acted upon an object when in fluid.

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3 years ago

Suppose that, while lying on a beach near the equator watching the Sun set over a calm ocean, you start a stopwatch just as the

Yuri [45]

Ans: Let d is the distance from height to our eyes.

<span>Applying the Pythagoras theorem, we get,</span>

<span>Check image: </span>

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3 years ago