This is an example of a closed system
Answer:
Some activities have been given in curriculum of various schools.
Explanation:
- The school is a pace where the young minds are trained and they get to know about the natural environment and thus their mindset is shaped by the interaction with there environments.
- Activities such as the traffic management system and the parking spaces and the low emission for the vehicles and the activities of the lawn cleaning and the cleaning of the classrooms and the activities related to the use of the classrooms which use a material that is 100% recyclable.
- Those activities that are related to the management of food and water resources in and outside the school are an important aspect that impacts the air, water and the soil quality of the environment and indirectly the natural vegetation.
Answer:
Two stars (a and b) can have the same luminosity, but different surface area and temperature if the following condition is met:
(T_a^4)(R_a^2) = (T_b^4)(R_b^2)
Explanation:
The luminosity of a star is the total energy that produces in one second. It depends on the size of the star and its surface temperature.
L = σ(T^4)(4πR^2)
L is the luminosity f the star, T is the temperature of the surface of the star and R is its radius.
Two stars can have the same luminosity if the relation between the radius and the surface temperature is maintained.
To see this lets suposed you have 2 stars, a and b, and the luminosities of each one of them:
L_a = σ(T_a^4)(4πR_a^2)
L_b = σ(T_b^4)(4πR_b^2)
you can assume that L_a and L_b are equal:
σ(T_a^4)(4πR_a^2) = σ(T_b^4)(4πR_b^2)
Now, you can cancel the constants:
(T_a^4)(R_a^2) = (T_b^4)(R_b^2)
as long as this relation between a and b is true, then the luminosity can be the same.
Answer: The earth's spin axis is tilted with respect to its orbital plane.
Explanation:
This is what causes the seasons. When the earth's axis points towards the sun, it is summer for that hemisphere. When the earth's axis points away, winter can be expected.
Whitney Smith was credited for the making of the "Global Arrowhead".
Hope this Helps!
