The critical constants of methane are pc = 45.6 atm, vc = 98.7 cm3 mol−1, and tc = 190.6 k. calculate the van der waals parameters of the gas and estimate the radius of the molecules.

How is sound energy produced a. vibrating objects b. objects being heated c. temperature differences d. stationary objects

While standing outdoors one evening, you are exposed to the following four types of electromagnetic radiation: yellow light from a sodium street lamp, radio waves from an am radio station, radio waves from an fm radio station, and microwaves from an antenna of a communications system. rank these type of waves in terms of increasing photon energy.

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?