Biology

Biology, 23.10.2019 11:00, brianabrady06

What is the brightness of a star

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Physics, 01.07.2019 14:50, jamarcusweverjr1133

Avariable star is one whose brightness alternately increases and decreases. for one such star, the time between periods of maximum brightness is 5.7 days, the average brightness (or magnitude) of the star is 4.2, and its brightness varies by ±0.25 magnitude. find a function that models the brightness of the star as a function of time (in days), t. (assume that at t = 0 the brightness of the star is 4.2 and that it is increasing.)

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Mathematics, 05.08.2019 16:20, dinosaur10

Acepheid variable star is a star whose brightness alternately increases and decreases. for a certain star, the interval between times of maximum brightness is 5.7 days. the average brightness of this star is 2.0 and its brightness changes by ±0.45. in view of these data, the brightness of the star at time t, where t is measured in days, has been modeled by the function b(t)=5.0+0.45 sin (2πt/4.6), where t is measured in days. find, correct to two decimal places, the rate of increase after five days.

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Biology, 25.08.2019 09:50, sis212

The brightness of a star depends on how much light is released by the star and how far the star is from earth. there are two ways to describe a star's brightness. a star's brightness is the brightness seen by humans on earth. a star's brightness is its actual brightness and does not depend on where the star is viewed from. a. apparent, absolute b. absolute, apparent c. terminal, initial d. initial, terminal

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