Brian uses a starter pistol to mark the start of a 100 m sprint. The sound wave produced by the pistol reflects from a nearby wall, and he hears the echo of the
shot 600 ms (milliseconds) after the pistol was fired. Calculate how far the wall
was from Brian. The speed of sound in air is approximately

Multiple choice
330 m/s.
990 m
0 1,980 m
99 m
198 m

An object starts from rest at point f and speeds up continuously as it moves around an oval. a. choose a point about 1/8 th of the way around the oval from point f, and label it point g. draw a vector to represent the velocity of the object at point g. b. determine the change in velocity vector   between points f and g.

Which lists the main components of darwin’s theory of evolution? a. random mutations drive evolution; the evolution of a population happens slowly; organisms have common ancestors; organisms do not change. b. natural selection drives evolution; the evolution of a population happens slowly; organisms have common ancestors; organisms change over time. c. natural selection drives evolution; the evolution of a population happens rapidly; organisms have common ancestors; organisms change over time. d. random mutations drive evolution; the evolution of a population happens rapidly; organisms have common ancestors; organisms do not change.

State the following: boyle's law and charle's law