A marble block has dimensions of 0.4m x 0.4m x 2m. Knowing that the density of marble is 2,400 kg / m3, calculate the mass of the block and Um bloco de mármore tem dimensões 0,4m x 0,4m x 2m. Sabendo que a densidade do mármore é 2 400 kg/m3, calcule a massa do bloco e responda:

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.

Awave is produced in a rope. the wave has a speed of 33 m/s and a frequency of 22 hz.

Atomic nuclei of almost all elements consist of