Sebuah bintang memiliki luminositas L = 0.4 L M dengan L M adalah luminositas Matahari. Bintang ini saat diamati dengan teleskop di Bumi memiliki densitas flux F = 6.23 × 10 − 14 W m − 2 . Tentukan jarak dari pengamat ke bintang ini (d)! Abaikan gangguan atmosfer dan gunakan luminositas Matahari L M = 3.826 × 10 26 W .

Alaser tag arena sells two types of memberships. one package costs $325 for one year of membership with an unlimited number of visits. the second package has $125 enrollment fee, includes five free visits, and costs and additional $8 per visit after the first five. how many visits would a person need to use for each type of membership to cost the same amount over a one-year period?

Technological solutions have good bad effects. what is one bad effect of spraying a chemical pesticide on crops

Which scenario describes intraspecific, indirect competition? a. a peacock defends its territory against another peacock. b. lions and hyenas compete for the same prey animals. c. a male black bear eats fish in an area of a lake, so other black bears can’t. d. different species of birds fight over spilled popcorn on the ground.