How did the Miller-Urey experiment attempt to recreate early conditions on Earth?
What will be an ideal response?
They combined gasses thought to be presents in Earth's early atmosphere and passed an electrical discharge through it to simulate lightning.
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A cubic container 20 cm on a side is filled with water. What is the mass of the water?
A tennis player wants to slam a serve at O so that the ball lands just inside the opposite corner of the court. What should the ratio
be for the initial velocity 
? The time t = 0 is the time when the ball is hit by the racket.
?
?
a.
W/L
b.
L/W
c.
d.
e.
Where did Earth’s (interior) heat come from?
a. volcanoes b. accretion and differentiation as Earth formed c. radioactivity d. all of the above e. b and c
An astronaut is taking a space walk when his tether breaks. He has a big drill. How can he get back to the space ship?
A. Turn his back to the ship and throw the drill forward B. Face the ship and throw the drill forward. C. Throw the drill towards the tether.