We can only tell the earth is rotating almost 960 miles an hour if we a
look at other people around us as a reference point.

b
look at mountains far away from us as a reference point.

c
use a reference that is not on the earth, like the sun or stars.

Aperson walking 1 mile everyday for exercise, leaving her front porch at 9: 00 am and returning to her front porch at 9: 25 am. what is the total displacement of her daily walk? a) 1 mileb) 0c) 25 minutes d) none of the above

Hydrogen atoms are excited by a laser to the =4n=4 state and then allowed to emit. what is the maximum number of distinct emission spectral lines (lines of different wavelengths) that can be observed from this system? 8 6 2 7 4 5 1 3 calculate the wavelength of the 4⟶14⟶1 transition. =λ=

Why do astronauts in the space shuttle weigh less?