Ask question

Ask question

All categories

Y_Kistochka [10]

2 years ago

5

The parachutists are not hurt when they jump out of an airplane, why?

1 answer:

Darya [45]2 years ago

7 0

When the parachute deploys it increases the persons air resistance to (temporaily) greater than the force of weight. This causes them to decellerate. As they decellerate resistance decreases again until once again it balances out. Terminal velocity is reduced to a safe level, and landing without injury is possible.

You might be interested in

Oxygen and hydrogen gas are at the same temperature T.What is the ratio of kinetic energies of oxygen molecule and hydrogen mole

VashaNatasha [74]

Answer

the ratio of kinetic energies of oxygen molecule and hydrogen molecule if oxygen is 16 times heavier than hydrogen is 1

Explanation

The average kinetic energy of a gas molecule at temperature T is given by following formula

$E =\frac{3kT}{2}$ ...............(1)

Here k is Boltzmann's constant ( $k=1.38\times 10^{-23} JK^{-1}$ ).

From above equation it is clear that average kinetic energy of a gas molecule only depends on temperature.

Therefore kinetic energy of oxygen molecule $E_{1}=\frac{3kT}{2}$ ....2

and kinetic energy of hydrogen molecule $E_{2}=\frac{3kT}{2}$ ....3

the ratio of kinetic energies of oxygen molecule and hydrogen molecule if oxygen is 16 times heavier than hydrogen is given as

$\frac{E_{1}}{E_{2}} =\frac{\frac{3kT}{2}}{\frac{3kT}{2}}$

$\frac{E_{1}}{E_{2}}=1$

Therefore, the ratio of kinetic energies of oxygen molecule and hydrogen molecule if oxygen is 16 times heavier than hydrogen is 1

6 0

3 years ago

The average kinetic energy of particles of matter is called

GenaCL600 [577]

Answer:

The answer is Temperature.

8 0

2 years ago

A lightning bolt occurs when billions of protons are transferred at the same time. ____________________

RSB [31]

True. You're suppose to answer true or false, right?

3 0

2 years ago

Most ocean waves obtain their energy and motion from _____.

OLga [1]

Centrifugal force of the earth's rotation as well as tidal forces caused by the moon's orbit and the sun's gravitational pull.

4 0

3 years ago

The valency of oxygen is 2

iren2701 [21]

Answer:

Yes the valency of oxygen is 2

5 0

2 years ago