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3 years ago

Does the sun always shine directly overhead at the equator at noon

1 answer:

4 0

The sun always shines directly overhead at noon. This is because the equator always gets the equivalent amount of sunlight. The area always get 12 hours of sunlight, because it's 0 degrees north and south and it's at the center of the Earth.

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If 35 mg of Oxygen is mixed with 1000 g of water at 25 degrees Celsius, a solution forms.

Serjik [45]

Answer:

The solute is oxygen

The solvent is water

Explanation:

A solvent is any chemical substance that dissolves other chemical substances, while a solute refers to any chemical substance that dissolves in other chemical substances. The best way to know when a chemical substance dissolves in another chemical substance is when a solid or gas dissolves in water. The solid or the gas can now be referred to as the solute and it will be shown to be in the the aqueous state, while the solvent is usually shown to be in the liquid state in any chemical equation.

Let us use the particular example of the dissolution of oxygen gas in water as shown below;

O2(g) + H2O(l)⇄O2(aq) + H2O(l)

The aqueous oxygen is the solute while the liquid water is the solvent.

Also, the substance having a smaller mass must be the solute and the substance having the larger mass must be the solvent.

3 0

3 years ago

The total consumption of electrical energy in the United States is about 1.0 1019 joules per year.

dexar [7]

Answer:

a) 316880878140.2895 Joules

b) 1056.26 Joules

c) 372.80103310622 km²

Explanation:

Energy consumption

$E=\frac{P}{t}\\\Rightarrow E=\frac{1\times 10^{19}}{365.25\times 24\times 60\times 60}\\\Rightarrow E=316880878140.2895\ W$

Average rate of electrical energy consumption is 316880878140.2895 Joules

Total population = 300 million

$E=\frac{316880878140.2895}{300\times 10^6}\\\Rightarrow E=1056.26\ J$

Each person consumes 1056.26 Joules.

Efficiency = 0.85

Power from Sun

$0.85\times 1000=850\ W/m^2$

Area

$\frac{316880878140.2895}{850}=372801033.10622\ m^2$

Converting to km²

$372801033.10622=\frac{372801033.10622}{1000\times 1000}=372.80103310622\ km^2$

Area required to collect the electrical energy used in the United States is 372.80103310622 km²

4 0

3 years ago

Read 2 more answers

Feathers and a bowling ball are dropped in a vacuum, airless environment. Which one will hit the ground first?

Reil [10]

Answer: at the same time

Explanation: in a vacuum, there isnt air, right? so there isnt gravity pushing down on the heavier object, so they will both land at the same time.

good? :)

8 0

3 years ago

Suppose that a 102.5 kg football player running at 8.5 m/s catches a 0.47 kg ball moving at a speed of 22.5 m/s with his feet of

nadya68 [22]

Answer:

a) $v=8.564\ m.s^{-1}$

b) $\Delta KE=45.76\ J$

c) $v=8.358\ m.s^{-1}$

d) $\Delta KE=225.24\ J$

Explanation:

Given:

mass of the player, $m_p=102.5\ kg$

mass of the ball, $m_b=0.47\ kg$

initial velocity of the player, $v_p=8.5\ m.s^{-1}$

initial velocity of the ball, $v_b=22.5\ m.s^{-1}$

<u>Case:</u> When the player and the ball are moving in the same direction.

$m_t.v=m_p.v_p+m_b.v_b$

where:

$m_t=$ total mass after the player catches the ball

v = final velocity of the system

$v=\frac{102.5\times 8.5+0.47\times 22.5}{(102.5+0.47)}$

$v=8.564\ m.s^{-1}$

Initial kinetic energy of the system:

$KE_i=\frac{1}{2} [m_p.v_p^2+m_b.v_b^2]$

$KE_i=\frac{1}{2} [102.5\times 8.5^2+0.47\times 22.5^2]$

$KE_i=3821.78\ J$

Final kinetic energy of the system:

$KE_f=\frac{1}{2} m_t.v^2$

$KE_f=\frac{1}{2}\times 102.97\times 8.564^2$

$KE_f=3776.02\ J$

∴Change in kinetic energy

$\Delta KE=KE_i-KE_f$

$\Delta KE=3821.78-3776.02$

$\Delta KE=45.76\ J$

<u>Case:</u> When the player and the ball are moving in the opposite direction.

$m_t.v=m_p.v_p-m_b.v_b$

$v=\frac{102.5\times 8.5-0.47\times 22.5}{(102.5+0.47)}$

$v=8.358\ m.s^{-1}$

Final kinetic energy in this case:

$KE_f=\frac{1}{2} m_t.v^2$

$KE_f=0.5\times 102.97\times 8.358^2$

$KE_f=3596.54\ J$

∴Change in kinetic energy:

$\Delta KE=KE_i-KE_f$

$\Delta KE=3821.78-3596.54$

$\Delta KE=225.24\ J$

3 0

3 years ago

Argon is compressed in a polytropic process with n 5 1.2 from 120 kpa and 108c to 800 kpa in a piston–cylinder device. determine

prohojiy [21]

A boiling pot of water (the water travels in a current throughout the pot), a hot air balloon (hot air rises, making the balloon rise) , and cup of a steaming, hot liquid (hot air rises, creating steam) are all situations where convection occurs.
Read more on Brainly.com - brainly.com/question/1581851#readmore

5 0

3 years ago