Aglass plate whose index of refraction is 1.66 is immersed in a liquid. the surface of the glass is inclined at an angle of 44º with the vertical. a horizontal ray in the glass is incident on the interface. when the liquid is a certain alcohol, the incident ray arrives at the interface at the critical angle. the index of refraction of the alcohol is closest to: o a. 1.13 ob. 1.17 o c. 1.15 o d. 1.11

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