The mechanical energy of a mass-spring system is 0.284 J. If the force constant of the spring of 151 N/m and the mass is 0.66 kg, what is the amplitude of the oscillatory motion in cm?

Atrain departs from its station at a constant acceleration of 5 m/s. what is the speed of the train at the end of 20s?

30 points - when can a theory be modified if a new type of technology allows for new observations that raise new questions? a. immediately, while the questions about the theory are being asked b. after new hypotheses related to the theory are tested in experiments c. only after the new observations disprove all parts of the theory d. while scientists begin to think about how the theory could improve

An object in mechanical equilibrium is an object