<span>The least common shape for a galaxy is cluster.
Galaxy, by definition, is an arrangement composing of stars, planets, gasses
and everything more that can be seen in the space. There are three types of
galaxies and they are elliptical, spiral and irregular. Spherical could be
applicable as elliptical if you got to choose only one on the choices above. Example
of spiral galaxy is the Milky Way galaxy where our Solar system is currently
located according to the scientists. </span>
Because they come came out of the same thing so duh
Speed of ball is 19.80 m/s .
<u>Explanation:</u>
We have , a 2.0 kg ball is resting at the top of a 20 m hill. if the ball rolls down the entire hill,We need to find how fast will it be going.Let's find out:
We know that,
Potential energy : This is the energy possessed by an object due to it's virtue of height and is given by , where m is mass , g is acceleration due to gravity & h is height !
Kinetic energy : This is the energy possessed by an object due to it's virtue of motion and is given by , where m is mass & v is the velocity of object !
By conservation of energy :
⇒
⇒
⇒
According to question , h=20 m i.e.
⇒
⇒
⇒
Hence , Speed of ball is 19.80 m/s .
For this question we can use the combined gas law equation.
for a fixed amount of gas
where P - pressure , V - volume , T- temperature and k - constant
Where parameters for the first instance are on the left side and parameters for the second instance are on the right side of the equation
temperature in K
T1 = 12 °C + 273 = 285 K
T2 - 16 °C + 273 = 289 K
substituting the values in the equation
V = 1.00 mL