Answer:
Explanation:
Let the luminosity of the star be I and luminosity of the sun be Isun.
2.4 billion light years = 2.4 x 10⁹ light years .
brightness = luminosity / (distance)²
Given Sun would have to be viewed from a distance of 1300 light-years to have the same apparent magnitude as 3C 273 so
For the sun
brightness = Isun / (1300 light years )²
For star
brightness = I / (2.4 x 10⁹ light years )²
Both these brightness are same
Isun / (1300 light years )² = I / (2.4 x 10⁹ light years )²
I = Isun x (2.4 x 10⁹ light years )² / (1300 light years )²
= Isun x 3.4 x 10¹² .
Answer:
The answer is below
Explanation:
a) The change in energy is the difference between the final energy and the initial energy.
ΔE (energy change) = Ef (final energy) - Ei (initial energy)
The negative sign shows that energy is lost to the environment. Hence 0.334 J is lost to the environment.
b) According to the law of conservation of energy, energy cannot be created or destroyed but transformed from one form to another.
The oscillating object loses energy due to wind resistance, friction between the spring and the object. Given that the air is frictionless, hence the energy loss is due to friction which is converted to heat.
the correct answer is 27 hours per week :) hope this helps
Answer:
The box contains a finite number of chocolates making it a closed system since this number does not change.
After taking the box and opening it to eat some chocolates it becomes an open system that can exchange chocolates with the medium
Explanation:
In thermodynamics an isolated system is a system in which no heat is exchanged with the medium, a closed system is a system where no particular one is exchanged with the surrounding medium.
In this case, the box can exchange heat since the cardboard walls are not insulating, so it is not an insulated system.
The box contains a finite number of chocolates making it a closed system since this number does not change.
After taking the box and opening it to eat some chocolates it becomes an open system that can exchange chocolates with the medium