Definition of luminosity is the total amount of energy emitted by the star per unit of time. We can use following formula to calculate the luminosity:
Where A is the surface area of the star.
We also have a very important mass-luminosity relationship:
This formula gives us relationship between stars mass and it's luminosity.
stands for Sun's luminosity and mass.
We can rewrite the luminosity formula like this:
Now if we divide this by the Sun's luminosity we get:
We can use this formula to estimate the mass. Surface temperature of the Sun is <span>5778 K.
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The answer would be 2 solar masses.
Answer:
The apparent weight is the weight of the body minus the weight of the liquid displaced. The body will float only when both the weights are same. In this case, the given body of weight W is floating and hence the apparent weight is zero.
Answer:
v
f=90km/h=25m/s
v_{_{i}}=0v
i=0
t=10\;\mathrm{s}t=10s
m=1000\;\mathrm{kg}m=1000kg