Each one of the elements in group 13 has three electrons in the outer shell of their nuclear structure
Answer:
Explanation:
PE = mgh where m is the mass in kg, g is the pull of gravity which is 9.8, and h is the height of the object above the point to which it could possibly fall, measured in meters. Plugging in:
PE = 10(9.8)(20) so
PE = 1960 J
This should be rounded to 1 sig fig according to the rules of sig fig and your numbers here, but I imagine you're not following them all that much. It should be 2000 J
I have worked in both situations, and I understand each
of their preferences.
I hope both Kevin and Marsha are successful at their jobs,
and may they live long and prosper.
Thank you for sharing their heartwarming stories.
Answer:
The ratio of initial to final speed of sound is given as 1.28.
Explanation:
As per the thermodynamic relation of isentropic expansion

Here
is the pressure at point 1 which is given as 2.2 MPa
is the temperature at point 1 which is given as 77 °C or 273+77=350K
is the pressure at point 1 which is given as 0.4 MPa
is the temperature at point 2 which is to be calculated- k is the ratio of specific heats given as 1.4
Substituting values in the equation

As speed of sound c is given as

for initial to final values it is given as

As values of k and R is constant so the ratio is given as

Substituting values give

So the ratio of initial to final speed of sound is 1.28.
Answer:

Explanation:
There is no external force applied, therefore there is a moment's preservation throughout the trajectory.
<em>Initial momentum = Final momentum. </em>
The total mass is equal to

Where,
mass of ship
mass of fuell expeled.
As the moment is conserved we have,

Where,
Velocity of fuel
Velocity of Space Ship
Solving and re-arrange to
we have,



Where c is the speed of light.
Therefore the ship be moving with speed

