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Usimov [2.4K]
3 years ago
10

What fact do scientists believe provides evidence for the big bang theory?a. all comets follow elliptical orbits.b. most extra-s

olar planets are gas giants.c. all stars feature nuclear fusion in their core.d. all distant galaxies are moving away from us. apex?
Chemistry
2 answers:
snow_tiger [21]3 years ago
8 0

Answer:

D

Explanation:

This is because it is believed that the galaxy was once crammed into a tiny spot and the Big Bang explosion sent the universe expanding and galaxies hurtling way into space away from each other. The force from the Big Bang that is believed to cause this expansion is dark energy.

saw5 [17]3 years ago
4 0

Answer:

D

Explanation:

While all the mentioned phenomena do take place in the universe, the only one that provides evidence of the Big Bang is option D, where distant galaxies are moving further away from us as time goes on.

This is believed to be a result from the Big Bang that projected the known universe into all directions, and they are moving away because of momentum from the explosion so many years ago.

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How much heat does a 100. g sample of copper absorb when its temperature increases by 30.0°C? The specific heat of copper is 0.3
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Answer:

\boxed {\boxed {\sf B. \ 1170 \ Joules }}

Explanation:

We are asked to find how much heat a sample of copper absorbs when the temperature is increased.

Since we know the mass, temperature increase, and specific heat capacity, we can use the following formula to calculate heat.

q= mc \Delta T

The mass of the copper sample is 100 grams, the temperature is changed or increased by 30.0 degrees Celsius, and the specific heat of copper is 0.39 Joules per gram degrees Celsius.

  • m= 100 g
  • c= 0.39 J/g °C
  • ΔT= 30.0 °C

Substitute the values into the formula.

q= (100 \ g )(0.39 \ J/g \textdegree C ) (30.0 \textdegree C )

Multiply the first two values. Note that the units of grams cancel.

q= 39 \ J/ \textdegree C (30.0 \textdegree C )

Multiply again, this time the units of degrees Celsius cancel.

q= 1170 \ J

The copper sample absorbs <u>1170 Joules</u> of heat and <u>Choice B </u>is correct.

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