According to Copernicus, retrograde motion for Venus must occur around : a. greatest elongation, when the planet is farthest from the Sun.
b. inferior conjunction, when it passes between us and the Sun.
c. superior conjunction, when the planet is on the far side of the Sun.
d. opposition, when the planet lies opposite the Sun in the sky.
e. quadrature, when the planet is 90 degrees away from the Sun.

The of a machine determines its "usefulness." a. input force b. output force c. mechanical advantage

Amass attached to a spring is displaced from its equilibrium position by 5cm and released. the system then oscillates in simple harmonic motion with a period of 1s. if that same mass–spring system is displaced from equilibrium by 10cm instead, what will its period be in this case? a mass attached to a spring is displaced from its equilibrium position by and released. the system then oscillates in simple harmonic motion with a period of . if that same mass–spring system is displaced from equilibrium by instead, what will its period be in this case? a) 0.5sb) 2sc) 1sd) 1.4s

In which type of system is power held solely by the central government and not shared with regional governments? group of answer choices federal unitary confederate oligarchic