On the scale of your paper solar system (1 m = -40 AU), how far would you need to draw the nearest star to Earth if that star was 4 ly away? Show your work.
(Hint: 1 ly = 63241 AU)

How does convection affect our atmosphere? our layers of earth? our oceans?

What is the rate of change in a objects position?

Henry, whose mass is 95 kg, stands on a bathroom scale in an elevator. the scale reads 830 n for the first 2.4 s after the elevator starts moving, then 930 n for the next 2.4 s. part a what is the elevator's speed 4.8 s after starting? express your answer with the appropriate units.