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3 years ago

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Please help! A Boeing 747 aircraft has a landing speed of 72 m/s , and upon landing it is able to come to a stop in 2, 000m . As

suming constant deceleration , how long would it take for a Boeing 747 to come to a full stop?

1 answer:

Andre45 [30]3 years ago

4 0

27.8 seconds is how long it would take to land

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A cylinder containing an ideal gas has a volume of 2.6 m3 and a pressure of 1.5 × 105 Pa at a temperature of 300 K. The cylinder

frozen [14]

<h2>Answer: $13.5\times 10^{8}$ joules</h2>

Explanation:

From the first law of thermodynamics,

Δ $Q$ =Δ $U$ + $W$

Where $Q$ is the heat given to the gas,

$U$ is the internal energy of the gas,

$W$ is the workdone by the gas.

When pressure is constant,

$\frac{V_{1}}{T_{1}}=\frac{V_{2}}{T_{2}}$

$V_{2}=\frac{2.6\times 900}{300}=7.8m^{3}$

When pressure is constant, $W=P$ Δ $V$

Where $P$ is pressure and $V$ is the volume of the gas.

Given $P=1.5\times 10^{5}Pa$

Δ $V=$ $7.8-2.6=5.2m^{3}$

So, $W=1.5\times 10^{5}\times 5.2=7.8\times 10^{5}J$

Given that Δ $U=6\times 10^{5}$

So,Δ $Q=$ $6\times 10^{5}+7.8\times 10^{5}=13.8\times 10^{5}J$

5 0

4 years ago

1. Use Newton's first law of motion to explain how wearing a seat belt in a moving car could help prevent injury

hjlf

The diver is plummiting to earth and if he does not put it soon he is going to die

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3 years ago

A scientist that applies the laws of science to the needs of communities is called _____.

s2008m [1.1K]

Answer:

The experimental scientist

5 0

3 years ago

Which of the following statements about energy is false?

Artemon [7]

Answer:

c

Explanation:

5 0

3 years ago

How long was a 50 W lightbulb left on for if 500,002 J were burned?

saveliy_v [14]

" 50 W " means " 50 Watts " or " 50 Joules per second ".

(500,002 J) / (50 J/sec) = <em>10,000.04 seconds</em>

(That's 2 hours 46 minutes 40.04 seconds.)

3 0

3 years ago