Um automóvel percorre uma estrada com função horária s = - 40 + 80t, onde s é dado em km e t em horas. Qual o instante em que o automóvel passa pelo km zero?

A2000 kg car is rounding a curve of radius 200 m on a level road. the maximum frictional force the road can exert on the tires of the car is 4000 n. what is the highest speed at which the car can round the curve?

What part of the ear is names after tools, such as the hammer and the anvil?

Which is not true of the intertropical convergence zone? a) it features heavy precipitation b) it's where the trade winds collidec) it's a high-pressure zone with sinking air d) it is also known as the doldrums