What is a crucial piece of evidence that an ancient greek astronomer could have used to support the geocentric model of the solar system?

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?

Both independent and dependent clauses

Why do metals "give up" their valence electrons?