57:30 The equations are not balanced. Which equation would have the same coefficients in the same order as 2CO2 +
3H20 → C2H2O + 302?
O FeCl3 + NH4OH → Fe(OH)3 + NHACI
O CH4 + O2 → CO2 + H2O
O Fe + H2SO4 → Fe2(SO4)3 + H2
O PCI+ H2O → HCl + H3PO4

Arotating space station is said to create “artificial gravity”—a loosely-defined term used for an acceleration that would be crudely similar to gravity. the outer wall of the rotating space station would become a floor for the astronauts, and centripetal acceleration supplied by the floor would allow astronauts to exercise and maintain muscle and bone strength more naturally than in non-rotating space environments. if the space station is 200 m in diameter, what angular velocity would produce an “artificial gravity” of 9.80 m/s^{2} 2 at the rim?

An object's buoyant force and weight mean the same thing.a. trueb. false

Assume you measured the mass of the cart to be (500 ± 1) g and the mass of the additional mass you put on the cart to be (500 ± 1) g as well. since the scale you are using in the lab cannot measure objects heavier than 600g you will have to sum up individual pieces and propagate the error. so what would be the mass and the standard error of the cart and the mass