A3.00 kg object rests upon a frictionless, horizontal floor. the object is attached to a horizontal spring (of force constant k = 485 n/m) whose other end is anchored to a nearby wall. the object is pulled until it lies a distance xi = 4.85 cm from its equilibrium position (x = 0). the object is then released and undergoes simple harmonic motion.

Which explanation describes the forces involved for a person to walk down the sidewalk? a. the person's feet push backward on the sidewalk; the sidewalk pushes backward on the person. b. the person's feet push forward on the sidewalk; the sidewalk does not push on the person. c. the person's feet push backward on the sidewalk; the sidewalk pushes forward on the person. d. the person's feet push forward on the sidewalk; the sidewalk pushes forward on the person.

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

Acalorimeter uses the principle that thermal energy flows from hotter material to colder material until both reach the same