Can you help me pls A block of lead has a volume of 140.4 cm and a mass of 1587 grams. From this information, calculate the density of
Lead,

In order to place a satellite into orbit, it requires enough fuel to supply the necessary mechanical energy. into what types of mechanical energy does the fuel get transformed?

How many molecules are present in 3 mols of silicon dioxide (sio2)?

According to an observer on earth, planet x is stationary. maria and samir depart earth on their spaceships at the same time, each flying at 0.5c. maria flies toward planet x and samir flies in the opposite direction. according to maria, her voyage to planet x takes 9 years. how many years does maria's voyage take according to samir?