Which statement is true? a) all waves travel at the same speed through any medium. b) all waves travel at the same speed if no medium is present. c) electromagnetic waves require a medium, but mechanical waves do not. d) mechanical waves require a medium, but electromagnetic waves do not. eliminate

What is the measure of a change in an objects velocity?

Write down two additional questions about earth's magnetic field that will make your presentation more informative.

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