A Cepheid star is a type of variable star, which means that its brightness is not constant.
Use a calculator to solve each problem. Round
your answers to the nearest hundredth.
The relationship between the brightness of a
Cepheid star and its period, or length of its pulse,
is given by
What is the absolute magnitude of a star that has
a period of 62 days?
M = - 2.78 (log P) - 1.35,
RETRY
where M is the absolute magnitude, or
brightness, of the star, and P is the number of
days required for the star to complete one cycle.
Moo

The position of a moving particle is given by the position function: f(t)=-9t-t^2-0.2t^3+0.1t^4 a. at what time does the particle reverse direction? b. when is the displacement positive? (round one decimal place and answer in interval notation) c. when is the displacement negative? (round one decimal place and answer in interval notation) d. when is the particle’s acceleration positive? (round one decimal place and answer in interval notation) e. when is the particle’s acceleration negative? (round one decimal place and answer in interval notation)