If, in the remote future, we establish a base on mercury, keeping track of time will be a challenge. discuss how to define a year on mercury, and the two ways to define a day. can you come up with ways that humans raised on earth might deal with time cycles on mercury?

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