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3 years ago

10

Causes an increase in the kinetic energy of atoms within an element and an increase in the kinetic energy of molecules or ions w

ithin a compound

1 answer:

Step2247 [10]3 years ago

5 0

heat being supplied might do

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Find the rotational inertia of a cylinder. Mass is 2.0kg, radius .21m

Musya8 [376]

<h3><u>Answer;</u></h3>

= 0.09 m/s

<h3><u>Explanation</u>;</h3>

The rotational inertia of a cylinder is given by the formula;

I = mr² , where I is the inertia, m is the mass, and r is the radius.

Inertia = 2.0 × 0.21²

= 0.0882 m/s

<u> ≈ 0.09 m/s </u>

7 0

3 years ago

The flow rate over Niagara falls is 84,760 cfs (cubic feet per second), and the drop from top to bottom is 167 feet. If this flo

jekas [21]

To develop this problem we will calculate the volume from the given flow (volume per unit of time). This process will be accompanied by transforming the units given in the International system.

Through the density-volume-mass ratio, we will calculate the mass. Finally we will proceed to calculate the total power generated.

1 feet = 0.3048 m

$\dot{V} = 84760ft^3/s$

$\dot{V} = 84760ft^3/s (\frac{(0.3058m)^3}{(1ft)^3})$

$\dot{V} = 2400m^3/s \text{and the Volume each second is } V= 2400m^3$

Now the mass of water falling down each second would be

$\rho = \frac{m}{V} \rightarrow m = \rho V$

$m = (1000kg/m^3)(2400m^3)$

$m = 2.4*10^6kg$

Now Height in meters is

$h = 167 ft (\frac{(0.3058m)}{(1ft)})$

$h= 50.9 m$

The power produced is equivalent to the work done by gravity over a certain time. At this case that can be expressed as,

$P = \frac{W}{t}\\P = \frac{F*h}{t}\\P = \frac{mgh}{t}\\P = \frac{2.4*10^6*9.8*50.9}{1}\\P = 1.197*10^9 Watts$

The power of Niagara Falls then would be 1.197GW while the power generated by the Three Gorges Dam is 22,500 MW. This indicates that the Niagara Falls, if it were a dam that covered 100% of the fluid it carries, would exceed the production of the dam in China by thousands.

8 0

4 years ago

Listed following are three possible models for the long-term expansion (and possible contraction) of the universe in the absence

Lynna [10]

Answer:

1) Recollapsing universe

2) critical universe

3) Coasting universe

Explanation:

According to the smallest ration (ratio actual mass density to current density) to largest ration, rank of models for expansion of universe are

1) Recollapsing universe -in this, metric expansion of space is reverse and universe recollapses.

2) critical universe - in this, expansion of universe is very low.

3) Coasting universe - in this, expansion of universe is steady and uniform

6 0

3 years ago

Alpha radiation is ______.

KonstantinChe [14]

B because alpha radiation is just the amount of alpha particles, c could also be plausible but i think gamma rays are more deadly

3 0

3 years ago

Our solar system is a part of the

Alexxx [7]

The Milky Way Galaxy

Hope this helps and have a great day :)

~Kayleigh

6 0

3 years ago