Which properties are characteristics of pure substances, and which are characteristics of mixtures? Pure Substances Mixtures

May be multiple states of matter
Exist in the same state of matter
Can be seperated physically
Have consistent properties
Cannot be seperated physically
Cannot be a single element

Cathy is pedaling down a steep hill on her bicycle and wants to be able to coast up the next hill, which is 25 meters high, without pedaling. cathy and her bicycle have a mass of 75 kg. assuming her bicycle is 100% efficient, what would her speed have to be?

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

Mechanical energy is when the amount of kinetic and potential energies added together remains the same. conserved created lost