Para asegurar un ajuste perfecto, los remaches de aluminio usados en los aviones se fabrican ligeramente más gruesos que los orificios y se los enfría con hielo seco (CO2sólido) antes de ser introducidos en los orificios. Si el diámetro de un orificio es de 20 mm . Cuál debe ser el diámetro del remache a 20 ºC para que su diámetro sea igual al orificio cuando se enfría a -78 ºC que es la temperatura del hielo seco. coef. del aluminio= 24x10-6ºC-1.

How many seconds does it take a pebble released from rest off a bridge to fall 29.4 m ? what is the pebble's speed when it has fallen 29.4 m ?

Consider an ordinary, helium-filled party balloon with a volume of 2.2 ft3. the lifting force on the balloon due to the outside air is the net resultant of the pressure distribution exerted on the exterior surface of the balloon. using this fact, we can derive archimedes’ principle, namely that the upward force on the balloon is equal to the weight of the air displaced by the balloon. assuming that the balloon is at sea level, where the air density is 0.002377 slug/ft3, calculate the maximum weight that can be lifted by the balloon. note: the molecular weight of air is 28.8 and that of helium is 4.

The slope of a velocity time graph over any interval of time gives the during that interval