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Colt1911 [192]
3 years ago
10

What does it mean when a mineral has a definite chemical composition? Select 2 choices.

Physics
1 answer:
Sergeu [11.5K]3 years ago
8 0

Answer:

Option (2) and (4)

Explanation:

Minerals are the building blocks of rocks and they are comprised of a certain range of chemical substances whose variety of forms and their arrangements are in a preferred orientation.

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___ is the combination of all colors of light
TiliK225 [7]
The color white is what you'd see when every color of light is combined.
5 0
3 years ago
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What is the speed of a wave that has a frequency of 125 Hz and a wavelength of 1.25 meters?
kirill115 [55]
Using the "v = f. λ" <span>equation...
 
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5 0
3 years ago
a projectile is launched at an angle of 30 degrees and lands later at the same level. if it's initial speed is 50 m/s, solve for
Mrrafil [7]
using \: the \: formula \\ t = \frac{2u \sin( \alpha ) }{g} where \: u = initial \: speed \: \\ \alpha = angle \: of \: projection \\ g = acceleration \: due \: to \: gravity \\ \frac{2 \times 50 \times \sin(30) }{10} \\ \frac{100 \times 0.5}{10} = \frac{50}{10} = 5seconds

Maximum height
= (Usinα)^2/2g
(50*0.5)^2/20
25^2/20
625/20
=31.25metres
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[50^2 * sin60]/10
2500 * 0.8660/10
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3 0
3 years ago
You push very hard on a heavy desk, trying to move it. You do work on the desk:
frozen [14]

Answer:

(C) Only if it starts moving

Explanation:

We know that work done is given by

W=F.d=Fdcos\Theta

So there are two case in which work done is zero

First case is that when force and displacement are perpendicular to each other

And other case is that when there is no displacement

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So option (c) will be the correct option

3 0
3 years ago
Can a light bulb work without energy transfer.
Scrat [10]

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Explanation:

6 0
3 years ago
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