Two pistons push down on the fluid filling two cylinders connected by a narrow hose, as shown in the figure. The area A1 is 1 square inch, and the area A2 is 10 square inches. A force of 4 pounds is exerted downward on piston 1, as shown
The force F2 needed to keep piston 2 in place is __________.
40 lbs
Physics & Space Science
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Imagine that an electron with an initial spin state 
goes into an SGx device and comes out the – channel of that device. The electron’s spin state is now
A. 
B. 
C. 
D. 
E. 
Physics & Space Science
When ice melts, its temperature __________
Fill in the blank(s) with correct word
Physics & Space Science
Tracks, borings, and burrows are examples of
a. replaced remains. b. index fossils. c. trace fossils. d. microfossils.
Physics & Space Science
The planet that is most tipped to its orbital plane is
A) Mars. B) Jupiter. C) Saturn. D) Uranus. E) Neptune.
Physics & Space Science