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OverLord2011 [107]
3 years ago
15

Helppp, will give brainliest answer !!

Physics
1 answer:
Crazy boy [7]3 years ago
6 0

The answer would be C

:) Have a good day :)

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A 2,000 g quantity of C-14 is left to undergo radioactive decay. The half-life of C-14 is approximately 5,700 years. After going
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Start with 2,000 grams.
After 1 half-life, 1,000 grams are left.
After another half-life, 500 are left.
After another half-life, 250 are left.
After another half-life, 125 are left.

That was FOUR half-lifes.

X = 4 .
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rocks move trough the rock cycle through uplift,folding,and faulting cased by movements of the earth´s________
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Tectonic plates and convection cells move tectonic plates
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A ball rolls down a ramp. A small amount of friction heats up the ball. What energy transformations are taking place?
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As the ball rolls down kinetic energy is converted to heat energy

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3 years ago
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Describe each of the following as a physical or chemical property. a. Neon is a colorless gas at room temperature.b. Apple slice
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Answer: Neon is a colorless gas at room temperature: Physical property

At room temperature, mercury is a liquid: Physical property

Apple slices turn brown when exposed to air: Chemical property

Phosphorus will ignite when exposed to air: Chemical property

Explanation:

Physical property is defined as the property of a substance which becomes evident during physical change in which there is alteration in shape, size etc. No new substance gets formed during physical change.

Example:  Neon is a colorless gas at room temperature

At room temperature, mercury is a liquid.

Chemical property is defined as the property of a substance which becomes evident during chemical change in which a change in chemical composition takes place. A new substance is formed in these reactions.

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3 years ago
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What is the tangential velocity of a record player which makes 11 revolutions in 20 seconds?
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Answer:

The tangential velocity of a rotating object is:

v = r*w

where r is the radius, and w is the angular velocity.

w = 2*pi*f

where f is the frequency.

We know that the record plater does 11 revolutions in 20 seconds, then it does:

11 rev/20s = 0.55 rev/s = f

then we have:

w = 2*pi*0.55 s^-1 = 2*3.14*0.55 s^-1 = 3.454 s^-1

The radius of a record player is really variable, it is around 10 inches, so i will use r = 10in, which is the rotating part of the record player.

then the tangential velocity is:

v = 10in*3.454 s^-1 = 34.54 in/s

7 0
3 years ago
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