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3 years ago

Why can't passenger planes fly very high?

2 answers:

8 0

The higher in the atmosphere, the less oxygen, and the more cold temperatures.

The material/moisture on the plane would freeze and damage the engine.

Evgen [1.6K]3 years ago

4 0

Plane engines need oxygen to burn fuel, they have to get their oxygen from the outside air. If they fly too high, the oxygen concentration in the air will drop too low for the engine to maintain combustion and will cause it to stall.

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In the history of astronomy, which of the following is true? . A] Tycho Brahe built one of the first observatories. B] Ptolemy w

Gelneren [198K]

D. <span>Johannes Kepler argued that Earth was the center of the universe.

</span>

4 0

4 years ago

Read 2 more answers

One end of a metal rod is in contact with a thermal reservoir at 699. K, and the other end is in contact with a thermal reservoi

bulgar [2K]

Answer:

a)ΔS₁ = - 9.9 J/K

ΔS₂ = 69 J/K

b)The entropy change for the rod = 0 J/K

c)ΔS = 59.1 J/K

Explanation:

Given that

T₁ = 699 K

T₂= 101 K

Q= 6970 J

Change in entropy given as

$\Delta S=\dfrac{Q}{T}$

For 699 K:

$\Delta S_1=\dfrac{Q}{T}$

$\Delta S_1=-\dfrac{6970}{699}$

ΔS₁ = - 9.9 J/K ( Negative because heat is leaving from the system)

For 101 K;

$\Delta S_2=\dfrac{Q}{T}$

$\Delta S_2=\dfrac{6970}{101}$

ΔS₂ = 69 J/K

The entropy change for the rod = 0 J/K

Entropy change for the system

ΔS = ΔS₂ + ΔS₁

ΔS = 69 -9.9 J/K

ΔS = 59.1 J/K

8 0

3 years ago

A missle is flying at a speed 125 m/s. if the missle has a mass of 125 kg. What’s it’s kinetic energy

Fynjy0 [20]

Answer:

$976562.5\ Joules$

Explanation:

$We\ are\ given:\\The\ mass\ of\ the\ missile=125\ kg\\The\ velocity\ of\ the\ missile=125\ m/s\\Hence,\\As\ we\ know\ that,\\Kinetic\ energy\ possessed\ by\ an\ object\ with\ mass\ m\ moving\\ with\ a\ velocity\ v:\\E_k=\frac{1}{2}mv^2\\Here,\\The\ Kinetic\ Energy\ possessed\ by\ the\ missile=\frac{1}{2}*125*(125)^2=976562.5\ Joules$