2- a car pitches down in front when the brakes are applied sharply. explain this observation in terms of torques.8- give an example of a system in which the net force is zero but the net torque is nonzero. veaqualitativedescriptionofthelocationofthecenterofmassoftheglassanditscontentsastheglassisslowlyfilledwithwater.16- what purpose does the tail rotor on a helicopter serve?22-youhavetwoeggs, determinewhichiswhick,youspintheeggsonthekitchencounter.whicheggspinsfaster?explain.18-apuckonahorizontal,frictio thepuckrotatesaboutthehole,thestringispulleddownward,bringingthepuckclosetothehole,duringthisprocess,whathappenstothepuck'slinearspeed?itsangularspeed?itsangularmomentum?

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