Three resistors are connected into the section of a circuit described by the diagram. at which labeled point or points of the circuit could a fourth resistor be added in series with r1?
a. point y point z
b. point x only
c. point y only
d. point z only

Suppose a force of 60 n is required to stretch and hold a spring 0.1 m from its equilibrium position. a. assuming the spring obeys hooke's law, find the spring constant k. b. how much work is required to compress the spring 0.5 m from its equilibrium position? c. how much work is required to stretch the spring 0.6 m from its equilibrium position? d. how much additional work is required to stretch the spring 0.1 m if it has already been stretched 0.1 m from its equilibrium? a. kequals 600