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3 years ago

12

Light traveling through air strikes the surface of the four different materials below. which material reflects light but doesn't

refract it?
Options:
A-Metal Spoon
B-Water Droplets
C-Diamond
D-Prism

2 answers:

Dmitriy789 [7]3 years ago

7 0

B....……................

lisov135 [29]3 years ago

5 0

It A) a metal spoon hope this help

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Noah drops a rock with a density of 1.73 g/cm3 into a pond. Will the rock float or sink?

Katarina [22]

Explanation:

Substances with their density less than that of water which is 1 g/cm³ will float on it whiles those greater than that of water will sink into the water

From the question the density of the object is greater than that of water so the object will sink into the water

Hope this helps you

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3 years ago

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A turntable reaches an angular speed of "45 rev/min" in "4.10 s" after being turned on. What is its angular acceleration?

Marina86 [1]

Answer:

1.15 rad/s²

Explanation:

given,

angular speed of turntable = 45 rpm

= $45\times \dfrac{2\pi}{60}$

= $4.71\ rad/s$

time, t = 4.10 s

initial angular speed = 0 rad/s

angular acceleration.

$\alpha = \dfrac{\omega_f-\omega_0}{t}$

$\alpha = \dfrac{4.71-0}{4.10}$

$\alpha = 1.15\ rad/s^2$

Hence, the angular acceleration of the turntable is 1.15 rad/s²

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3 years ago

Chemical energy is converted to electrial energy in a

VMariaS [17]

Answer:

Battery

Explanation:

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2 years ago

Alekssandra [29.7K]

Answer:

Question 5: The outer core has a lower temperature and lower pressure than the inner core

This is because the outer core is not as hot as the inner core. It is also under slightly less pressure. Due to this, the outer core is liquid and less dense than the inner core.

Question 6: I'm not sure what the answer to that is.. but I believe you'll figure it out!

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3 years ago

Four identical point charges (+4.0 µC) are placed at the corners of a square which has 20- cm sides. How much work is required t

vodka [1.7K]

The work required to assemble this charge arrangement starting with each of the charges as very large distance from any of the other charges is +1.9 J.

<h3>Work done</h3>

The work required to assemble this charge arrangement starting with each of the charges as very large distance from any of the other charges is calculated as follows;

W = qV

where;

V is the potential energy
q is the charge

$W = q (\frac{kq}{r} )$

where;

r is the distance of separation of the charges

Distance between two diagonal of a square = r√2

$W = q (\frac{kq}{r} + \frac{kq}{r\sqrt{2} } + \frac{kq}{r} )\\\\W = \frac{kq^2}{r} ( 2 + \frac{1}{\sqrt{2} } )\\\\W = \frac{(9\times 10^9 \times (4\times 10^{-6})^2}{0.2} ( 2.707)\\\\W = 1.9 \ J$

Thus, the work required to assemble this charge arrangement starting with each of the charges as very large distance from any of the other charges is +1.9 J.

Learn more about work done here: brainly.com/question/8119756

#SPJ1

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1 year ago