Giúp mình với ạ mình cần gấp :((

Curious carl calculated the density of a cube to be 4.50 g/cm3. what is the density of the cube in g/l?

In positive numbers less than 1, the zeros between the decimal point and a non-zero number are blank significant

Balloon a has charge q, and identical mass balloon b has charge 10q. you hang them from threads near each other. choose all of the statements with which you agree. check all that apply. a. a and b exert the same magnitude forces on each other. b. the force that a exerts on b is 10 times the force that b exerts on a. c. the angle between the thread supporting a and the vertical is < the angle between the thread supporting b and the vertical. d. the force that a exerts on b is 1/10 the force that b exerts on a.