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3 years ago

why would it not be necessary to heat the air in the balloon as much if the air outside the balloon is colder?

2 answers:

5 0

Hot-air balloons float because the air caught inside the balloon is heated up by a burner, making it less dense than the air outside. As the burner heats the air, it expands and some of the air escapes; that's what makes it less dense

Scilla [17]3 years ago

4 0

Hot air is less dense than cold air and so hot air will be buoyant when surrounded by cold air. Hot air balloons can only fly when the air inside the balloon is much hotter than the air outside it. When the air outside is very cold, then the air inside the balloon doesn't have to be as hot to lift it up.

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4. An 82 kg hiker climbs Mt. Humphrey near Flagstaff. During a two hour period, the hiker's

bazaltina [42]

Answer:

$\Delta E = 434253.96\,J$ , $\Delta P = 60.313\,W$

Explanation:

The change in energy is given by the change in gravitational potential energy:

$\Delta E = m\cdot g \cdot \Delta h$

$\Delta E = (82\,kg)\cdot (9.807\,\frac{m}{s^{2}} )\cdot (540\,m)$

$\Delta E = 434253.96\,J$

The average rate of change in terms of time is approximately this:

$\Delta P = \frac{\Delta E}{\Delta t}$

$\Delta P = \frac{434253.96\,J}{(2\,h)\cdot (\frac{3600\,s}{1\,h} )}$

$\Delta P = 60.313\,W$

8 0

3 years ago

One mole of aluminum atoms has a mass of 27 grams. How many grams are in 9.0 moles of aluminum?

gizmo_the_mogwai [7]

27*9=243 if one mole is equal to 27 grams times that by 9

6 0

3 years ago

What is the ionic charge for C, Si, Ge, Sn and Pb?

Alecsey [184]

An atom of carbon has 4 electrons in its outermost shell, which means that
its ionic charge is 4+ or 4-
Si is in same group as carbon so its also 4+ or 4-
Germanium is 4+.
Sn is also 2+ or 4+
Pb is usually +2

6 0

3 years ago

Describe how to test your unknown salt mixture for the presence of Na3PO4.12H2O.

klemol [59]

Na3PO4*12H2O + BaCl2*2H2O = Ba3(PO4)2 + NaCl + H2O

add barium chloride to your Na3PO4.12H2O a white precipitate of Ba3(PO4)2 will be formed wrt salt(NaCl) and water(H20) if Na3PO4.12H2O. will be there.

6 0

3 years ago

In the following reaction, how many liters of oxygen produce 560 liters of

saw5 [17]

The balanced chemical reaction will be:

CH4 + 2O2 → CO2 + 2H2O

We are given the amount of carbon dioxide to produce from the reaction. This will be our starting point.

560 L CH4 ( 1 mol CH4/ 22.4 L CH4 ) (2 mol O2/ 1 mol CH4 ) ( 22.4 L O2 / 1 mol O2) = 1120 L O2

7 0

3 years ago

Read 2 more answers