A gas heated to millions of degrees would emit mostly x-rays.
By definition we have that the density is given by:

Where,
M: mass of the sample
V: volume occupied by the sample
Therefore, substituting values in the given equation we have:


Answer:
the density of a sample of gas with a mass of 30 g and a volume of 7500 cm3 is:

E = 1/2 m v^2
108000m /3600 = 30m/s
E = 1525 * 0.5 * 30 = 22875 J
Answer:
2.5 cm
40 D
Explanation:
When the radius of curvature of a lens is divided by 2 we get the focal length of the lens.
Focal length is given by

The focal length of the lens is 2.5 cm
When we divide 1 by the focal length in the unit of meters we get the power of a lens
Power of a lens is given by

The power of the lens is 40 D
The type of star is the north star