Imagine that you are sitting in a closed room (no windows, no doors) when, magically, it is lifted from Earth and sent accelerating through space with an acceleration of 1g (9.8 m/s2).
According to Einstein's equivalence principle, which of the following is true? A) You won't feel any change and will have no way to know that you've left Earth.
B) You'll feel a force that will cause your head to repeatedly bang into the ceiling.
C) You'll know that you left Earth because when you drop a ball it will fall sideways.
D) You'll know that you left Earth because you'll be floating weightlessly in your room.
Question 2
Which of the following observations is consistent with the hypothesis that all life on Earth has a common ancestor?
A) different organisms use the same set of amino acids
B) different organisms use different sets of amino acids
C) all proteins are made of amino acids
D) some organisms don't use amino acids at all
A closed circulatory system.
Windows 95 Collage
Lucas Samaras, Room No. 2 (popularly known as the Mirrored Room) (detail).
Good alignment for sitting posture.
Acetylation and deacetylation in open and closed chromatin structure