0.30 s after seeing a puff of smoke rise from the starter pistol the sound of the firing of the pistol is heard by the track time by a 100m away. what is the speed of sound

Two steel balls, each of mass m, are welded to a light rod of length l and negligible mass and are initially at rest on a smooth horizontal surface. a horizontal force of magnitude f is suddenly applied to the rod as shown. determine (a) the instantaneous acceleration a of the mass center g and (b) the corresponding rate at which the angular velocity of the assembly about g is changing with time.

Select the correct answer. what does the process of natural selection involve?

Photons with the highest energy have the longest period