Sirius has an apparent magnitude of -1.5. canopus has an apparent magnitude of -0.7. which of the following statements is true?

sirius is brighter than canopus.
sirius is hotter than canopus.
the brightness ratio is 1.5 : 0.7.
the absolute magnitude of sirius is 15.

Which articulations allow for greatest range of motion?

Two resistors r1 and r2 may be connected either in series or parallel across an ideal battery with emf ε. we desire the rate of energy dissipation of the parallel combination to be 8.75 times that of the series combination. if r1 = 105 ω, what are the (a) smaller and (b) larger of the two values of r2 that result in that dissipation rate?

Energy flows from the producer level to the level. is called