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3 years ago

How does the theory of natural selection explain the diversity of life?

Physics

1 answer:

Pavlova-9 [17]3 years ago

8 0

Because the ones that have better adaptions survive and spread on the genes for that adaptation

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Pls help its about baseball and energy (one question) '^'

avanturin [10]

The answer would be A. As the bat is swung, it gains kinetic energy. But once it hits the ball, it loses, or transfers, it’s kinetic energy to the ball.

5 0

3 years ago

A globe is an example of a physical model true or false

mars1129 [50]

True. Because you can touch it and it's physically real.

4 0

3 years ago

Read 2 more answers

A 2.64-kg copper part, initially at 400 K, is plunged into a tank containing 4 kg of liquid water, initially at 300 K. The coppe

marin [14]

Answer:

a) $T_f=305.7049\ K$

b) $\Delta S=313.51\ J.K^{-1}$

Explanation:

Given:

mass of copper, $m_c=2.64\ kg$

initial temperature of copper, $T_{ic}=400\ K$

specific heat capacity of copper, $c_c=385\ J.kg^{-1}.K^{-1}$

mass of water, $m_w=4\ kg$

initial temperature of water, $T_{iw}=300\ K$

specific heat capacity of water, $c_w=4200\ J.kg^{-1}.K^{-1}$

∵No heat is lost in the environment and the heat is transferred only between the two bodies:

Heat rejected by the copper = heat absorbed by the water

$2.64\times 385\times (400-T_f)= 4\times 4200\times (T_f-300)$

$T_f=305.7049\ K$

Now the amount of heat transfer:

$Q=m_c.c_c.(T_{ic}-T_{f})$

$Q=2.64\times 385\times (400-305.7049)$

$Q=95841.5841\ J$

∴Entropy change

$\Delta S=\frac{dQ}{T}$

$\Delta S=\frac{95841.5841}{305.7049}$

$\Delta S=313.51\ J.K^{-1}$

5 0

4 years ago

Which are responsible for holding atoms together?

Scrat [10]

Hey there!

Your answer: shared electrons

There would usually be two forces that would make an atom stick together. It would be the positive, and negative of a electric charge. All this coming together would be the electromagnetic force. This is liked we talked about, both positive and negative charges attracted. And that would be the strong force. Which then gives our answer to be electrons.

Your answer: shared electrons

4 0

3 years ago

Read 2 more answers

How many revolutions per minute would a 25 m -diameter ferris wheel need to make for the passengers to feel "weightless" at the

kozerog [31]

Refer to the diagram shown below.

Let ω = the angular velocity (rad/s) of the wheel.

At the topmost point, the passenger, with mass m, will feel weightless if the passenger's weight matches the centripetal force.
The passenger's weight is mg.
The centripetal force is mω²r.

Therefore
mω²r = mg
ω = √(g/r)

Because g = 9.8 m/s² and r = 25/2 = 12.5 m, therefore
ω = √(9.8/12.5) = 0.8854 rad/s

Because 1 revolution per second is 2π rad/s, therefore
$\omega = (0.8854 \, \frac{rad}{s} )*( \frac{1}{2 \pi} \, \frac{rev}{rad} )*(60 \, \frac{s}{min} ) = 8.455 \, rev/min$

Answer: 8.455 rev/min

8 0

3 years ago