The diagram below shows a model of the Earth's orbit around the Sun. Positions I, II, III, and IV represents Earth's position at the beginning of
each season.

Between which two positions does the Earth's Northern Hemisphere move
from Summer to Fall/Autumn?

I and III

II and III

IV and II

I and IV

Ateam of astronauts is on a mission to land on and explore a large asteroid. in addition to collecting samples and performing experiments, one of their tasks is to demonstrate the concept of the escape speed by throwing rocks straight up at various initial speeds. with what minimum initial speed vesc will the rocks need to be thrown in order for them never to "fall" back to the asteroid? assume that the asteroid is approximately spherical, with an average density p 3.84 x108 g/m3 and volume v 2.17 x 1012 m3 recall that the universal gravitational constant is g 6.67 x 10-11 n m2/kg2

An object is 10 cm from the mirror, its height is 1 cm and the focal length is 5 cm. what is the image height? (indicate the object orientation by including the + or - sign with the answer.) hi = cm +1 -1 +10 -10

Which type of bond is found between the atoms of a molecule? a. metallic b. delocalized electron c. covalent d. ionic