In which example does speed remain constant while velocity changes?
OA) A boy skates east at 3 m/s.
OB) A biker goes around a circular track at 5 m/s.
OC) An ant crawls northwest toward a crumb at 2 cm/s.
OD) A swimmer swims in a lane toward the shallow end at 4 m/s.

The two stars in a certain binary star system move in circular orbits. the first star, alpha, has an orbital speed of 36 km/s. the second star, beta, has an orbital speed of 12 km/s. the orbital period is 137 d. a) what is the mass of the star alpha? b) what is the mass of the star beta?

A10-kg isto a of 10 m at aa0.9 kg/m.30 kg of ,at aas10-m .. ( 9.8 m/s2 g.)

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