Explanation:
According to Thermal Expansion of solids:
Answer:
2 g/cm³
Explanation:
m = Mass of object
v = Volume
ρ = Density
When ρ = 2 g/cm³ , v = 5 cm³
All the objects have same mass, which is 10 grams
When v = 5 cm³
Density of third object is 2 g/cm³
The initial force of motion and inward acting force
Most of the stars in our universe are in binary systems. Hence, the size of the stars can be found when one star eclipses the other. When so happens, the change in the luminosity is measured and size is calculated. Another way is by measuring the luminosity of the star and comparing it with the Sun's luminosity. As the luminosity is dependent on the size of the star, the radius of the star can be calculated when compared to the Sun. Following formula can be used:
Star's radius/Sun's radius = (Sun's temperature/star's temperature)2 Sqrt[star's luminosity/Sun's luminosity].
