Two pistons push down on the fluid filling two cylinders connected by a narrow hose, as shown in the figure. The area A 1 is 1 square inch, and the area A 2 is 10 square inches. A force of 4 pounds is exerted downward on piston 1, as shown. 
The force F 2 needed to keep piston 2 in place is __________.
Definitions:
Clinical Psychology
A branch of psychology that focuses on diagnosing and treating mental, emotional, and behavioral disorders.
Doctorate
The highest level of academic degree, typically requiring advanced study and research in a specific field.
Critical-thinking Guidelines
Principles or strategies designed to promote the objective analysis and evaluation of an issue in order to form a judgment.
Gut Reaction
An immediate or instinctive emotional reaction to something, without conscious thought.
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