Answer:
Q=0.16*c kJ
Explanation:
Heat transfer and energy changes is related by the equation
Q=mcΔT
where
Q=heat transfer
m=mass of substance
c=specific heat of the material
ΔT= change in temperature
Given
m= 4 kg
c=c
ΔT=40° C
Q=4*c*40
Q=160c
Q=160/1000*c kJ
Q=0.16*c kJ
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:
From the following statements about mechanical waves, identify those that are true for transverse mechanical waves only, those that are true for longitudinal mechanical waves only, and those that are true for both types of waves.
Explanation:
Answer
When the light goes from one medium to another medium with higher refractive index the velocity of the ray decreases, wavelength of the ray also decreases.
But the frequency of the ray when it enters the medium of higher refractive index remain same.
So, we can conclude that speed of ray and wavelength decrease but frequency remain unchanged.