The apparent brightness is defined by how much light we get pretty much. The formula is:
This takes into account that the light is spreading out to a sphere that has the surface given by 4πd^2.
We have that d=20 ly and 1 ly is 9.46*10^12 km or 9.46*10^15m.
Hence, d=20*9.46*10^15=189.2 *10^15 m
Now, we can substitute the d value and calculate that L=<span>8.45184*
W/m^2</span>
Answer: b. Clear-cutting
Explanation: Clear cutting is a cheap and effective way of harvesting trees or timbers, this methods helps the forest operators to get the best out of a forest at a very reduced cost.
Clear-cutting is bad because removing the whole tree from an area destroys outrightly the natural habitat of most widelife, and it will also lead to the destruction of the eco-system that relies on the forest.
Instead, they packed the earth, which is rich in clay, into thick walls that provided insulation from the hot summers and cold winters.
Explanation:
hope that helped :)
Answer:
C. Isasaalang-alang Ko Ang Klima Ng Isang Lugar.
Paliwanag:
Ang pinakamahusay na paraan upang paghiwalayin ang isang rehiyon ay batay sa klima sapagkat ang bawat rehiyon ay may magkakaibang klima dahil sa taas at distansya mula sa ekwador. Ang mga rehiyon na matatagpuan sa mataas na taas, ay may cool na klima habang sa kabilang banda, ang mga rehiyon na nasa ekwador o malapit sa ekwador na mayroong mainit at mainit na klima upang mapagpasyahan natin na ang klima ay isang mabuting kadahilanan upang paghiwalayin ang mga rehiyon.
Answer:
b. a theory
Explanation:
A theory is said to be a well structured explanation of a result in particular field of study. A theory tend to follow series of steps in an attempt to explain a result ;
Hypothesis : This is said to be a knowledgeable guess in the field of sciences.
Observation : The scientist engage in thorough study or observation of the experiment or facts he wants to establish.
Experiments : The scientist engage in series of experiments to back up his fact and observation.
A theory is propounded if it is testable . The theory must have passed through a series of scientific research to become an establish facts. It must pass numerous scientific investigation and often involving contribution from well meaning scientist in that domain. The theory must be simple , precise and express-able so it can be repeated by other scientist. This established fact should not contradict previous principles or theory but instead expand and agree with others.
