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3 years ago

Does aluminum foil refract light? Why?

Physics

1 answer:

nikitadnepr [17]3 years ago

4 0

yes it does it because the material cause it to refract and the stronger it is the more it will refract

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Why did the potassium permanganate crystals start to dissolve in water without being stirred or shaken

KonstantinChe [14]

<span>because the substance in the potassium permanganate crystals are permeable to water, so that means it will dissolve instantly while poured into water </span>

7 0

3 years ago

Read 2 more answers

Hanging from a horizontal beam are nine simple pendulums of the following lengths: (a) 0.080, (b) 0.26, (c) 0.49, (d) 0.90, (e)

mote1985 [20]

Answer:

Explanation:

This is the case of forced oscillation . The pendulum having the same or matching time period or angular frequency with that of angular frequency of external periodic force , will be in resonance having largest amplitude.

Angular frequency of pendulum having length .9 m

= $\sqrt{\frac{g}{l } }$

l = .9

angular frequency

= $\sqrt{\frac{10}{0.9 } }$

= 3.33 rad / s

If we calculate angular frequencies of pendulum of all lengths given , we will find that other lengths do not give angular frequency falling between 2 and 4 radian . So only pendulum having length of .9 m will have vibration of maximum amplitude.

8 0

3 years ago

HELP PLS ✨<br> What type of lava is in the Cerro Negro Volcano?

ale4655 [162]

Answer:

basaltic cinder cone

Explanation:

The volcano consists of a black ("negro") basaltic cinder cone with associated lava flows, including an aa flow field reaching 4 km to the NE and SW. The frequent eruptions of Cerro Negro have modified its morphology continuously since its birth 160 years ago

4 0

3 years ago

1. In which direction can a force be exerted on an object?

My name is Ann [436]

A. Any Direction
This should be obvious, as you can push down on something, push it to the sides, and push something up. Hope this helped!

3 0

4 years ago

alexandr402 [8]

Answer:

1.92 m/s

Explanation:

Velocity is defined as the distance moved per unit time with consideration of the direction. The direction aspect differentiates speed from velocity since for speed, we don't need to consider the direction.

$v=\frac {d}{t}$

Distance moved for circular path is equal to its circumference and the circumference is given by $2\pi r$ where r is the radius and substituting $2\pi r$ for d then

$v=\frac {2\pi r}{t}$

Substituting 5.5 m for r and 18 s for t then

$v=\frac {2\pi \times 5.5}{18}=1.919862177 m/s\approx 1.92 m/s$

To the nearest hundredth, the velocity is 1.92 m/s

4 0

4 years ago