A building 250 feet tall casts a 80 foot long shadow. If a person stands at the end of the shadow & looks up to the top of the building, what is the angle of the persons eyes to the top of the building (to the nearest hundredth of a degree)? (Assume The persons eyes are 6 feet above ground level)

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